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#1
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High Side Driver
High Side Driver...
http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#2
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
Sure, if you like flappy gates.
Also, who would buy an inductor when three BJTs does as well? I did the inductor thing years ago, must've been like 2008ish. Plus a transformer: http://seventransistorlabs.com/Image...off_Driver.png But I'd much rather spend a few cents and as many watts with a CCS turnoff than a few bucks inductor. Better still, just use H bridge drive (TL598). Tim -- Seven Transistor Labs Electrical Engineering Consultation Website: http://seventransistorlabs.com "Jim Thompson" wrote in message ... High Side Driver... http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#3
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On Tue, 7 Jan 2014 14:55:39 -0600, "Tim Williams"
wrote: Sure, if you like flappy gates. Also, who would buy an inductor when three BJTs does as well? I did the inductor thing years ago, must've been like 2008ish. Plus a transformer: http://seventransistorlabs.com/Image...off_Driver.png But I'd much rather spend a few cents and as many watts with a CCS turnoff than a few bucks inductor. Better still, just use H bridge drive (TL598). Tim I guess you didn't observe the load current? In general I'd guess your attention span is limited :-} The need is for a high side driver, controlled by a 3.3V logic signal. And the inductor is ~7 cents in the quantities used by my customer, and he's very cramped for space. (In addition, schematic has been munged to hide details... customer only has +3.8V high-side supply, which must deliver 8 Amps to load with minimal drop.) ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#4
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On 1/7/2014 10:47 AM, Jim Thompson wrote:
High Side Driver... http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson I have a problem with Jim's pages, the lines are to thin to see, I suspect my reader, and will try adobe. How do I pull up associations? I've done it a dozen times but can't figure it out now. The reader I use is Foxit (I think, I find no identifying info) Thanks, Mikek |
#5
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On Tue, 07 Jan 2014 15:10:46 -0600, amdx wrote:
On 1/7/2014 10:47 AM, Jim Thompson wrote: High Side Driver... http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson I have a problem with Jim's pages, the lines are to thin to see, I suspect my reader, and will try adobe. How do I pull up associations? I've done it a dozen times but can't figure it out now. The reader I use is Foxit (I think, I find no identifying info) Thanks, Mikek The free Adobe X Reader seems to work just fine. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#6
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
amdx wrote: On 1/7/2014 10:47 AM, Jim Thompson wrote: High Side Driver... http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson I have a problem with Jim's pages, the lines are to thin to see, I suspect my reader, and will try adobe. How do I pull up associations? I've done it a dozen times but can't figure it out now. The reader I use is Foxit (I think, I find no identifying info) Right click on the file and choose: 'Open With', then select 'Choose Program'. It will tell you what the default program is, and let you change it. -- Anyone wanting to run for any political office in the US should have to have a DD214, and a honorable discharge. |
#7
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On Tue, 07 Jan 2014 14:06:14 -0700, Jim Thompson
wrote: On Tue, 7 Jan 2014 14:55:39 -0600, "Tim Williams" wrote: Sure, if you like flappy gates. Also, who would buy an inductor when three BJTs does as well? I did the inductor thing years ago, must've been like 2008ish. Plus a transformer: http://seventransistorlabs.com/Image...off_Driver.png But I'd much rather spend a few cents and as many watts with a CCS turnoff than a few bucks inductor. Better still, just use H bridge drive (TL598). Tim I guess you didn't observe the load current? In general I'd guess your attention span is limited :-} The need is for a high side driver, controlled by a 3.3V logic signal. And the inductor is ~7 cents in the quantities used by my customer, and he's very cramped for space. (In addition, schematic has been munged to hide details... customer only has +3.8V high-side supply, which must deliver 8 Amps to load with minimal drop.) ...Jim Thompson How clever of you, to change the supply voltage to 12, to conceal from us that the actual voltage is 3.8. Well done! -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators |
#8
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On Tue, 07 Jan 2014 18:53:05 -0800, John Larkin
wrote: On Tue, 07 Jan 2014 14:06:14 -0700, Jim Thompson wrote: On Tue, 7 Jan 2014 14:55:39 -0600, "Tim Williams" wrote: Sure, if you like flappy gates. Also, who would buy an inductor when three BJTs does as well? I did the inductor thing years ago, must've been like 2008ish. Plus a transformer: http://seventransistorlabs.com/Image...off_Driver.png But I'd much rather spend a few cents and as many watts with a CCS turnoff than a few bucks inductor. Better still, just use H bridge drive (TL598). Tim I guess you didn't observe the load current? In general I'd guess your attention span is limited :-} The need is for a high side driver, controlled by a 3.3V logic signal. And the inductor is ~7 cents in the quantities used by my customer, and he's very cramped for space. (In addition, schematic has been munged to hide details... customer only has +3.8V high-side supply, which must deliver 8 Amps to load with minimal drop.) ...Jim Thompson How clever of you, to change the supply voltage to 12, to conceal from us that the actual voltage is 3.8. Well done! Of course! I have to leave some tidbit for you to whine about. Otherwise your sycophants will realize you're an idiot, and we can't have that... at least not quite yet :-} ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#9
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On Tue, 07 Jan 2014 19:55:02 -0700, Jim Thompson
wrote: On Tue, 07 Jan 2014 18:53:05 -0800, John Larkin wrote: On Tue, 07 Jan 2014 14:06:14 -0700, Jim Thompson wrote: On Tue, 7 Jan 2014 14:55:39 -0600, "Tim Williams" wrote: Sure, if you like flappy gates. Also, who would buy an inductor when three BJTs does as well? I did the inductor thing years ago, must've been like 2008ish. Plus a transformer: http://seventransistorlabs.com/Image...off_Driver.png But I'd much rather spend a few cents and as many watts with a CCS turnoff than a few bucks inductor. Better still, just use H bridge drive (TL598). Tim I guess you didn't observe the load current? In general I'd guess your attention span is limited :-} The need is for a high side driver, controlled by a 3.3V logic signal. And the inductor is ~7 cents in the quantities used by my customer, and he's very cramped for space. (In addition, schematic has been munged to hide details... customer only has +3.8V high-side supply, which must deliver 8 Amps to load with minimal drop.) ...Jim Thompson How clever of you, to change the supply voltage to 12, to conceal from us that the actual voltage is 3.8. Well done! Of course! I have to leave some tidbit for you to whine about. Otherwise your sycophants will realize you're an idiot, and we can't have that... at least not quite yet :-} ...Jim Thompson So, how did you calculate the R and L values? I assume you did it twice, once for 12 volts and once for 3.8. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators |
#10
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On Tue, 07 Jan 2014 18:57:28 -0800, John Larkin
wrote: On Tue, 07 Jan 2014 19:55:02 -0700, Jim Thompson wrote: On Tue, 07 Jan 2014 18:53:05 -0800, John Larkin wrote: On Tue, 07 Jan 2014 14:06:14 -0700, Jim Thompson wrote: On Tue, 7 Jan 2014 14:55:39 -0600, "Tim Williams" wrote: Sure, if you like flappy gates. Also, who would buy an inductor when three BJTs does as well? I did the inductor thing years ago, must've been like 2008ish. Plus a transformer: http://seventransistorlabs.com/Image...off_Driver.png But I'd much rather spend a few cents and as many watts with a CCS turnoff than a few bucks inductor. Better still, just use H bridge drive (TL598). Tim I guess you didn't observe the load current? In general I'd guess your attention span is limited :-} The need is for a high side driver, controlled by a 3.3V logic signal. And the inductor is ~7 cents in the quantities used by my customer, and he's very cramped for space. (In addition, schematic has been munged to hide details... customer only has +3.8V high-side supply, which must deliver 8 Amps to load with minimal drop.) ...Jim Thompson How clever of you, to change the supply voltage to 12, to conceal from us that the actual voltage is 3.8. Well done! Of course! I have to leave some tidbit for you to whine about. Otherwise your sycophants will realize you're an idiot, and we can't have that... at least not quite yet :-} ...Jim Thompson So, how did you calculate the R and L values? I assume you did it twice, once for 12 volts and once for 3.8. Think about it JOHN! Fundamentals! Sheeeesh! I'm sorry! I apologize! You're a victim of your Tulane kindergarten education. My sincere apologies :-} ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#11
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On Tue, 07 Jan 2014 20:01:22 -0700, Jim Thompson
wrote: On Tue, 07 Jan 2014 18:57:28 -0800, John Larkin wrote: On Tue, 07 Jan 2014 19:55:02 -0700, Jim Thompson wrote: On Tue, 07 Jan 2014 18:53:05 -0800, John Larkin wrote: On Tue, 07 Jan 2014 14:06:14 -0700, Jim Thompson wrote: On Tue, 7 Jan 2014 14:55:39 -0600, "Tim Williams" wrote: Sure, if you like flappy gates. Also, who would buy an inductor when three BJTs does as well? I did the inductor thing years ago, must've been like 2008ish. Plus a transformer: http://seventransistorlabs.com/Image...off_Driver.png But I'd much rather spend a few cents and as many watts with a CCS turnoff than a few bucks inductor. Better still, just use H bridge drive (TL598). Tim I guess you didn't observe the load current? In general I'd guess your attention span is limited :-} The need is for a high side driver, controlled by a 3.3V logic signal. And the inductor is ~7 cents in the quantities used by my customer, and he's very cramped for space. (In addition, schematic has been munged to hide details... customer only has +3.8V high-side supply, which must deliver 8 Amps to load with minimal drop.) ...Jim Thompson How clever of you, to change the supply voltage to 12, to conceal from us that the actual voltage is 3.8. Well done! Of course! I have to leave some tidbit for you to whine about. Otherwise your sycophants will realize you're an idiot, and we can't have that... at least not quite yet :-} ...Jim Thompson So, how did you calculate the R and L values? I assume you did it twice, once for 12 volts and once for 3.8. Think about it JOHN! Fundamentals! Sheeeesh! I'm sorry! I apologize! You're a victim of your Tulane kindergarten education. My sincere apologies :-} ...Jim Thompson OK, you can't do it. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators |
#12
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
In article ,
Jim Thompson wrote: High Side Driver... http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson Doesn't the magic smoke come out if there's even a tiny bit of current leakage draining away the voltage that L1 transferred to MN1's base? Or if the control signal to MN2 has a bit of a bounce? At least in your slightly obfuscated circuit, that would leave MN1 pumping out about 2 times its rated wattage. PSpice needs a "circuit board in the tropics" mode. |
#13
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On 1/7/2014 6:46 PM, Michael A. Terrell wrote:
amdx wrote: On 1/7/2014 10:47 AM, Jim Thompson wrote: High Side Driver... http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson I have a problem with Jim's pages, the lines are to thin to see, I suspect my reader, and will try adobe. How do I pull up associations? I've done it a dozen times but can't figure it out now. The reader I use is Foxit (I think, I find no identifying info) Right click on the file and choose: 'Open With', then select 'Choose Program'. It will tell you what the default program is, and let you change it. Thanks, I had to save it before I could right click. I looks much better using Adobe than it does Foxit Reader. Anyone else have a problem seeing the lines... hmm, now after saving the file and opening it with Foxit, the schematic looks better with Foxit than Adobe. Any time I want to view Jim's schematics, I'll save it first. I think that was the solution. Mikek |
#14
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On 1/7/2014 6:46 PM, Michael A. Terrell wrote:
amdx wrote: On 1/7/2014 10:47 AM, Jim Thompson wrote: High Side Driver... http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson I have a problem with Jim's pages, the lines are to thin to see, I suspect my reader, and will try adobe. How do I pull up associations? I've done it a dozen times but can't figure it out now. The reader I use is Foxit (I think, I find no identifying info) Right click on the file and choose: 'Open With', then select 'Choose Program'. It will tell you what the default program is, and let you change it. Thanks, I had to save it before I could right click. I looks much better using Adobe than it does Foxit Reader. Anyone else have a problem seeing the lines... hmm, now after saving the file and opening it with Foxit, the schematic looks better with Foxit than Adobe. Any time I want to view Jim's schematics, I'll save it first. I think that was the solution. Mikek |
#15
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On Tue, 07 Jan 2014 22:38:47 -0800, Kevin McMurtrie
wrote: In article , Jim Thompson wrote: High Side Driver... http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson Doesn't the magic smoke come out if there's even a tiny bit of current leakage draining away the voltage that L1 transferred to MN1's base? Or if the control signal to MN2 has a bit of a bounce? At least in your slightly obfuscated circuit, that would leave MN1 pumping out about 2 times its rated wattage. PSpice needs a "circuit board in the tropics" mode. For this application the drive is repetitive at ~2kHz square-wave. Think of it as a one-cycle boost: When MN2 turns off, 0.5*L*I^2 gets transferred to 0.5*C*V^2, turning on MN1. When MN2 turns back on, the L is recharged and the gate of MN1 is discharged. Except for "tropics" mode ;-) I believe it will hold up for significantly lower rep-rates. The link now includes a complete .CIR file suitable to run directly in LTspice. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#16
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On Tue, 07 Jan 2014 22:38:47 -0800, Kevin McMurtrie
wrote: In article , Jim Thompson wrote: High Side Driver... http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson Doesn't the magic smoke come out if there's even a tiny bit of current leakage draining away the voltage that L1 transferred to MN1's base? Or if the control signal to MN2 has a bit of a bounce? At least in your slightly obfuscated circuit, that would leave MN1 pumping out about 2 times its rated wattage. PSpice needs a "circuit board in the tropics" mode. For this application the drive is repetitive at ~2kHz square-wave. Think of it as a one-cycle boost: When MN2 turns off, 0.5*L*I^2 gets transferred to 0.5*C*V^2, turning on MN1. When MN2 turns back on, the L is recharged and the gate of MN1 is discharged. Except for "tropics" mode ;-) I believe it will hold up for significantly lower rep-rates. The link now includes a complete .CIR file suitable to run directly in LTspice. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#17
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On Tue, 07 Jan 2014 09:47:23 -0700, Jim Thompson
wrote: High Side Driver... http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson 0.5*L*I^2 = Qg*Vg (Qg = Total Gate Charge, from data sheet, at gate voltage, Vg) Not "L = R^2 * C" "Close to it" (pretty close actually) would be... 0.5*L*I^2 = 0.5*C*V^2 It's all about energy transfer from magnetic storage to capacitive storage... and boost converters rely on it. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#18
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On Wed, 08 Jan 2014 17:24:04 -0700, Jim Thompson
wrote: On Tue, 07 Jan 2014 09:47:23 -0700, Jim Thompson wrote: High Side Driver... http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson 0.5*L*I^2 = Qg*Vg (Qg = Total Gate Charge, from data sheet, at gate voltage, Vg) [neglecting losses in diode and resistor, I'll include that RSN, otherwise someone will have another hissy fit :] Not "L = R^2 * C" "Close to it" (pretty close actually) would be... 0.5*L*I^2 = 0.5*C*V^2 It's all about energy transfer from magnetic storage to capacitive storage... and boost converters rely on it. ...Jim Thompson ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#19
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On Wed, 08 Jan 2014 17:24:04 -0700, Jim Thompson
wrote: On Tue, 07 Jan 2014 09:47:23 -0700, Jim Thompson wrote: High Side Driver... http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson 0.5*L*I^2 = Qg*Vg (Qg = Total Gate Charge, from data sheet, at gate voltage, Vg) [neglecting losses in diode and resistor, I'll include that RSN, otherwise someone will have another hissy fit :] Not "L = R^2 * C" "Close to it" (pretty close actually) would be... 0.5*L*I^2 = 0.5*C*V^2 It's all about energy transfer from magnetic storage to capacitive storage... and boost converters rely on it. ...Jim Thompson ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#20
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On Wed, 08 Jan 2014 17:24:04 -0700, Jim Thompson
wrote: On Tue, 07 Jan 2014 09:47:23 -0700, Jim Thompson wrote: High Side Driver... http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson 0.5*L*I^2 = Qg*Vg (Qg = Total Gate Charge, from data sheet, at gate voltage, Vg) Not "L = R^2 * C" "Close to it" (pretty close actually) would be... 0.5*L*I^2 = 0.5*C*V^2 Good grief! Do the algebra! -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation Picosecond-resolution Digital Delay and Pulse generators Custom timing and laser controllers Photonics and fiberoptic TTL data links VME analog, thermocouple, LVDT, synchro, tachometer Multichannel arbitrary waveform generators |
#21
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On 1/8/2014 9:17 AM, amdx wrote:
On 1/7/2014 6:46 PM, Michael A. Terrell wrote: amdx wrote: On 1/7/2014 10:47 AM, Jim Thompson wrote: High Side Driver... http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson I have a problem with Jim's pages, the lines are to thin to see, I suspect my reader, and will try adobe. How do I pull up associations? I've done it a dozen times but can't figure it out now. The reader I use is Foxit (I think, I find no identifying info) Right click on the file and choose: 'Open With', then select 'Choose Program'. It will tell you what the default program is, and let you change it. Thanks, I had to save it before I could right click. I looks much better using Adobe than it does Foxit Reader. Anyone else have a problem seeing the lines... hmm, now after saving the file and opening it with Foxit, the schematic looks better with Foxit than Adobe. Any time I want to view Jim's schematics, I'll save it first. I think that was the solution. Mikek Thank You! I had the same problem. After reading your post, I saved it then opened it. Bingo! Now it's readable. Ed |
#22
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On 1/8/2014 9:17 AM, amdx wrote:
On 1/7/2014 6:46 PM, Michael A. Terrell wrote: amdx wrote: On 1/7/2014 10:47 AM, Jim Thompson wrote: High Side Driver... http://www.analog-innovations.com/SED/HighSideDriver.pdf ...Jim Thompson I have a problem with Jim's pages, the lines are to thin to see, I suspect my reader, and will try adobe. How do I pull up associations? I've done it a dozen times but can't figure it out now. The reader I use is Foxit (I think, I find no identifying info) Right click on the file and choose: 'Open With', then select 'Choose Program'. It will tell you what the default program is, and let you change it. Thanks, I had to save it before I could right click. I looks much better using Adobe than it does Foxit Reader. Anyone else have a problem seeing the lines... hmm, now after saving the file and opening it with Foxit, the schematic looks better with Foxit than Adobe. Any time I want to view Jim's schematics, I'll save it first. I think that was the solution. Mikek Thank You! I had the same problem. After reading your post, I saved it then opened it. Bingo! Now it's readable. Ed |
#23
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High Side Driver
On Tue, 07 Jan 2014 20:07:41 -0800, John Larkin
wrote: On Tue, 07 Jan 2014 20:01:22 -0700, Jim Thompson wrote: On Tue, 07 Jan 2014 18:57:28 -0800, John Larkin wrote: On Tue, 07 Jan 2014 19:55:02 -0700, Jim Thompson wrote: On Tue, 07 Jan 2014 18:53:05 -0800, John Larkin wrote: On Tue, 07 Jan 2014 14:06:14 -0700, Jim Thompson wrote: On Tue, 7 Jan 2014 14:55:39 -0600, "Tim Williams" wrote: Sure, if you like flappy gates. Also, who would buy an inductor when three BJTs does as well? I did the inductor thing years ago, must've been like 2008ish. Plus a transformer: http://seventransistorlabs.com/Image...off_Driver.png But I'd much rather spend a few cents and as many watts with a CCS turnoff than a few bucks inductor. Better still, just use H bridge drive (TL598). Tim I guess you didn't observe the load current? In general I'd guess your attention span is limited :-} The need is for a high side driver, controlled by a 3.3V logic signal. And the inductor is ~7 cents in the quantities used by my customer, and he's very cramped for space. (In addition, schematic has been munged to hide details... customer only has +3.8V high-side supply, which must deliver 8 Amps to load with minimal drop.) ...Jim Thompson How clever of you, to change the supply voltage to 12, to conceal from us that the actual voltage is 3.8. Well done! Of course! I have to leave some tidbit for you to whine about. Otherwise your sycophants will realize you're an idiot, and we can't have that... at least not quite yet :-} ...Jim Thompson So, how did you calculate the R and L values? I assume you did it twice, once for 12 volts and once for 3.8. Think about it JOHN! Fundamentals! Sheeeesh! I'm sorry! I apologize! You're a victim of your Tulane kindergarten education. My sincere apologies :-} ...Jim Thompson OK, you can't do it. --- Won't isn't the same as can't. |
#24
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High Side Driver
On Tue, 07 Jan 2014 20:07:41 -0800, John Larkin
wrote: On Tue, 07 Jan 2014 20:01:22 -0700, Jim Thompson wrote: On Tue, 07 Jan 2014 18:57:28 -0800, John Larkin wrote: On Tue, 07 Jan 2014 19:55:02 -0700, Jim Thompson wrote: On Tue, 07 Jan 2014 18:53:05 -0800, John Larkin wrote: On Tue, 07 Jan 2014 14:06:14 -0700, Jim Thompson wrote: On Tue, 7 Jan 2014 14:55:39 -0600, "Tim Williams" wrote: Sure, if you like flappy gates. Also, who would buy an inductor when three BJTs does as well? I did the inductor thing years ago, must've been like 2008ish. Plus a transformer: http://seventransistorlabs.com/Image...off_Driver.png But I'd much rather spend a few cents and as many watts with a CCS turnoff than a few bucks inductor. Better still, just use H bridge drive (TL598). Tim I guess you didn't observe the load current? In general I'd guess your attention span is limited :-} The need is for a high side driver, controlled by a 3.3V logic signal. And the inductor is ~7 cents in the quantities used by my customer, and he's very cramped for space. (In addition, schematic has been munged to hide details... customer only has +3.8V high-side supply, which must deliver 8 Amps to load with minimal drop.) ...Jim Thompson How clever of you, to change the supply voltage to 12, to conceal from us that the actual voltage is 3.8. Well done! Of course! I have to leave some tidbit for you to whine about. Otherwise your sycophants will realize you're an idiot, and we can't have that... at least not quite yet :-} ...Jim Thompson So, how did you calculate the R and L values? I assume you did it twice, once for 12 volts and once for 3.8. Think about it JOHN! Fundamentals! Sheeeesh! I'm sorry! I apologize! You're a victim of your Tulane kindergarten education. My sincere apologies :-} ...Jim Thompson OK, you can't do it. --- Won't isn't the same as can't. |
#25
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver
On Sat, 11 Jan 2014 12:24:07 -0600, John Fields
wrote: On Tue, 07 Jan 2014 20:07:41 -0800, John Larkin wrote: On Tue, 07 Jan 2014 20:01:22 -0700, Jim Thompson wrote: On Tue, 07 Jan 2014 18:57:28 -0800, John Larkin wrote: On Tue, 07 Jan 2014 19:55:02 -0700, Jim Thompson wrote: On Tue, 07 Jan 2014 18:53:05 -0800, John Larkin wrote: On Tue, 07 Jan 2014 14:06:14 -0700, Jim Thompson wrote: On Tue, 7 Jan 2014 14:55:39 -0600, "Tim Williams" wrote: Sure, if you like flappy gates. Also, who would buy an inductor when three BJTs does as well? I did the inductor thing years ago, must've been like 2008ish. Plus a transformer: http://seventransistorlabs.com/Image...off_Driver.png But I'd much rather spend a few cents and as many watts with a CCS turnoff than a few bucks inductor. Better still, just use H bridge drive (TL598). Tim I guess you didn't observe the load current? In general I'd guess your attention span is limited :-} The need is for a high side driver, controlled by a 3.3V logic signal. And the inductor is ~7 cents in the quantities used by my customer, and he's very cramped for space. (In addition, schematic has been munged to hide details... customer only has +3.8V high-side supply, which must deliver 8 Amps to load with minimal drop.) ...Jim Thompson How clever of you, to change the supply voltage to 12, to conceal from us that the actual voltage is 3.8. Well done! Of course! I have to leave some tidbit for you to whine about. Otherwise your sycophants will realize you're an idiot, and we can't have that... at least not quite yet :-} ...Jim Thompson So, how did you calculate the R and L values? I assume you did it twice, once for 12 volts and once for 3.8. Think about it JOHN! Fundamentals! Sheeeesh! I'm sorry! I apologize! You're a victim of your Tulane kindergarten education. My sincere apologies :-} ...Jim Thompson OK, you can't do it. --- Won't isn't the same as can't. He won't because he can't. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation |
#26
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High Side Driver - Interesting Tidbits
It appears the only valid data point for these power MOSFET's is the
"total gate charge", Qg. The capacitances listed are useless for switch applications... their only value would appear to be if you were designing an RF amplifier. But here's the useful part... Cgeffective = 2*Qg/Vg This is the effective capacitance you must drive to reach your desired Vg. (Caution, use the Qg graph, not anything in a table... Qg increases with Vg.) Even the schmuck-in-chief should find that useful :-} ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#27
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver - Interesting Tidbits
On Sun, 12 Jan 2014 08:35:18 -0700, Jim Thompson
wrote: It appears the only valid data point for these power MOSFET's is the "total gate charge", Qg. The capacitances listed are useless for switch applications... their only value would appear to be if you were designing an RF amplifier. But here's the useful part... Cgeffective = 2*Qg/Vg This is the effective capacitance you must drive to reach your desired Vg. (Caution, use the Qg graph, not anything in a table... Qg increases with Vg.) Even the schmuck-in-chief should find that useful :-} ...Jim Thompson You said that you calculated the values in the circuit that you posted. Quit dancing around and show us that calculation. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation |
#28
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver - Interesting Tidbits
On Sun, 12 Jan 2014 09:58:44 -0800, John Larkin
wrote: On Sun, 12 Jan 2014 08:35:18 -0700, Jim Thompson wrote: It appears the only valid data point for these power MOSFET's is the "total gate charge", Qg. The capacitances listed are useless for switch applications... their only value would appear to be if you were designing an RF amplifier. But here's the useful part... Cgeffective = 2*Qg/Vg This is the effective capacitance you must drive to reach your desired Vg. (Caution, use the Qg graph, not anything in a table... Qg increases with Vg.) Even the schmuck-in-chief should find that useful :-} ...Jim Thompson You said that you calculated the values in the circuit that you posted. Quit dancing around and show us that calculation. Patience is a virtue. Are you not virtuous ?:-} ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#29
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver - Interesting Tidbits
On Sun, 12 Jan 2014 14:32:06 -0700, Jim Thompson
wrote: On Sun, 12 Jan 2014 09:58:44 -0800, John Larkin wrote: On Sun, 12 Jan 2014 08:35:18 -0700, Jim Thompson wrote: It appears the only valid data point for these power MOSFET's is the "total gate charge", Qg. The capacitances listed are useless for switch applications... their only value would appear to be if you were designing an RF amplifier. But here's the useful part... Cgeffective = 2*Qg/Vg This is the effective capacitance you must drive to reach your desired Vg. (Caution, use the Qg graph, not anything in a table... Qg increases with Vg.) Even the schmuck-in-chief should find that useful :-} ...Jim Thompson You said that you calculated the values in the circuit that you posted. Quit dancing around and show us that calculation. Patience is a virtue. Are you not virtuous ?:-} ...Jim Thompson Competence is a virtue too. Are you competent? I suspect you've never done it, as you claimed you had, and you're still struggling and stalling. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation |
#30
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver - Interesting Tidbits
On Sun, 12 Jan 2014 14:55:09 -0800, John Larkin
wrote: On Sun, 12 Jan 2014 14:32:06 -0700, Jim Thompson wrote: On Sun, 12 Jan 2014 09:58:44 -0800, John Larkin wrote: On Sun, 12 Jan 2014 08:35:18 -0700, Jim Thompson wrote: It appears the only valid data point for these power MOSFET's is the "total gate charge", Qg. The capacitances listed are useless for switch applications... their only value would appear to be if you were designing an RF amplifier. But here's the useful part... Cgeffective = 2*Qg/Vg This is the effective capacitance you must drive to reach your desired Vg. (Caution, use the Qg graph, not anything in a table... Qg increases with Vg.) Even the schmuck-in-chief should find that useful :-} ...Jim Thompson You said that you calculated the values in the circuit that you posted. Quit dancing around and show us that calculation. Patience is a virtue. Are you not virtuous ?:-} ...Jim Thompson Competence is a virtue too. Are you competent? I suspect you've never done it, as you claimed you had, and you're still struggling and stalling. It's actually been "done" since around noon, but I've been hanging paintings and doing other honey-do tasks. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#31
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver - Interesting Tidbits - BoostGateDrive_JT_2014_01_12.png
Here 'tis...
...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#32
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver - Interesting Tidbits - BoostGateDrive_JT_2014_01_12.png
Here 'tis...
...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#33
Posted to alt.binaries.schematics.electronic
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High Side Driver - Interesting Tidbits - BoostGateDrive_JT_2014_01_12.png
Here 'tis...
...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#34
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver - Interesting Tidbits
Tried to post a PNG here and in A.B.S.E, but it wouldn't take, so go
here.... http://www.analog-innovations.com/SED/BoostGateDrive_JT_2014_01_12.pdf ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#35
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver - Interesting Tidbits
On Sun, 12 Jan 2014 17:10:55 -0700, Jim Thompson
wrote: On Sun, 12 Jan 2014 14:55:09 -0800, John Larkin wrote: On Sun, 12 Jan 2014 14:32:06 -0700, Jim Thompson wrote: On Sun, 12 Jan 2014 09:58:44 -0800, John Larkin wrote: On Sun, 12 Jan 2014 08:35:18 -0700, Jim Thompson wrote: It appears the only valid data point for these power MOSFET's is the "total gate charge", Qg. The capacitances listed are useless for switch applications... their only value would appear to be if you were designing an RF amplifier. But here's the useful part... Cgeffective = 2*Qg/Vg This is the effective capacitance you must drive to reach your desired Vg. (Caution, use the Qg graph, not anything in a table... Qg increases with Vg.) Even the schmuck-in-chief should find that useful :-} ...Jim Thompson You said that you calculated the values in the circuit that you posted. Quit dancing around and show us that calculation. Patience is a virtue. Are you not virtuous ?:-} ...Jim Thompson Competence is a virtue too. Are you competent? I suspect you've never done it, as you claimed you had, and you're still struggling and stalling. It's actually been "done" since around noon, but I've been hanging paintings and doing other honey-do tasks. ...Jim Thompson So, on Jan 7, when you said "it was calculated", you lied. It took you almost a week to figure it out. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation |
#36
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver - Interesting Tidbits
On Sun, 12 Jan 2014 17:03:13 -0800, John Larkin
wrote: On Sun, 12 Jan 2014 17:10:55 -0700, Jim Thompson wrote: On Sun, 12 Jan 2014 14:55:09 -0800, John Larkin wrote: On Sun, 12 Jan 2014 14:32:06 -0700, Jim Thompson wrote: On Sun, 12 Jan 2014 09:58:44 -0800, John Larkin wrote: On Sun, 12 Jan 2014 08:35:18 -0700, Jim Thompson wrote: It appears the only valid data point for these power MOSFET's is the "total gate charge", Qg. The capacitances listed are useless for switch applications... their only value would appear to be if you were designing an RF amplifier. But here's the useful part... Cgeffective = 2*Qg/Vg This is the effective capacitance you must drive to reach your desired Vg. (Caution, use the Qg graph, not anything in a table... Qg increases with Vg.) Even the schmuck-in-chief should find that useful :-} ...Jim Thompson You said that you calculated the values in the circuit that you posted. Quit dancing around and show us that calculation. Patience is a virtue. Are you not virtuous ?:-} ...Jim Thompson Competence is a virtue too. Are you competent? I suspect you've never done it, as you claimed you had, and you're still struggling and stalling. It's actually been "done" since around noon, but I've been hanging paintings and doing other honey-do tasks. ...Jim Thompson So, on Jan 7, when you said "it was calculated", you lied. It took you almost a week to figure it out. I didn't lie. I didn't have it all in a compact form, it required iteration... now it doesn't, see... Newsgroups: sci.electronics.design,alt.binaries.schematics.ele ctronic,sci.electronics.cad,sci.electronics.basics Subject: High Side Driver - Interesting Tidbits Date: Sun, 12 Jan 2014 17:58:03 -0700 Message-ID: You really do need to grow up. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | San Tan Valley, AZ 85142 Skype: Contacts Only | | | Voice480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine. Sometimes I even put it in the food. |
#37
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver - Interesting Tidbits
On Sun, 12 Jan 2014 17:58:03 -0700, Jim Thompson
wrote: Tried to post a PNG here and in A.B.S.E, but it wouldn't take, so go here.... http://www.analog-innovations.com/SED/BoostGateDrive_JT_2014_01_12.pdf ...Jim Thompson So, still no evidence that you calculated the values that you claimed to have calculated. Because you didn't. And apparently still can't. You fiddled it in Spice, which was the sensible thing to do. So why lie about having calculated it? Bizarre. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation |
#38
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver - Interesting Tidbits
On Sun, 12 Jan 2014 18:06:08 -0700, Jim Thompson
wrote: On Sun, 12 Jan 2014 17:03:13 -0800, John Larkin wrote: On Sun, 12 Jan 2014 17:10:55 -0700, Jim Thompson wrote: On Sun, 12 Jan 2014 14:55:09 -0800, John Larkin wrote: On Sun, 12 Jan 2014 14:32:06 -0700, Jim Thompson wrote: On Sun, 12 Jan 2014 09:58:44 -0800, John Larkin wrote: On Sun, 12 Jan 2014 08:35:18 -0700, Jim Thompson wrote: It appears the only valid data point for these power MOSFET's is the "total gate charge", Qg. The capacitances listed are useless for switch applications... their only value would appear to be if you were designing an RF amplifier. But here's the useful part... Cgeffective = 2*Qg/Vg This is the effective capacitance you must drive to reach your desired Vg. (Caution, use the Qg graph, not anything in a table... Qg increases with Vg.) Even the schmuck-in-chief should find that useful :-} ...Jim Thompson You said that you calculated the values in the circuit that you posted. Quit dancing around and show us that calculation. Patience is a virtue. Are you not virtuous ?:-} ...Jim Thompson Competence is a virtue too. Are you competent? I suspect you've never done it, as you claimed you had, and you're still struggling and stalling. It's actually been "done" since around noon, but I've been hanging paintings and doing other honey-do tasks. ...Jim Thompson So, on Jan 7, when you said "it was calculated", you lied. It took you almost a week to figure it out. I didn't lie. I didn't have it all in a compact form, it required iteration... now it doesn't, see... You have never shown how you arrived at the values you posted, except to claim a calculation that you won't reveal. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation |
#39
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver - Interesting Tidbits
On Sun, 12 Jan 2014 18:06:08 -0700, Jim Thompson
wrote: On Sun, 12 Jan 2014 17:03:13 -0800, John Larkin wrote: On Sun, 12 Jan 2014 17:10:55 -0700, Jim Thompson wrote: On Sun, 12 Jan 2014 14:55:09 -0800, John Larkin wrote: On Sun, 12 Jan 2014 14:32:06 -0700, Jim Thompson wrote: On Sun, 12 Jan 2014 09:58:44 -0800, John Larkin wrote: On Sun, 12 Jan 2014 08:35:18 -0700, Jim Thompson wrote: It appears the only valid data point for these power MOSFET's is the "total gate charge", Qg. The capacitances listed are useless for switch applications... their only value would appear to be if you were designing an RF amplifier. But here's the useful part... Cgeffective = 2*Qg/Vg This is the effective capacitance you must drive to reach your desired Vg. (Caution, use the Qg graph, not anything in a table... Qg increases with Vg.) Even the schmuck-in-chief should find that useful :-} ...Jim Thompson You said that you calculated the values in the circuit that you posted. Quit dancing around and show us that calculation. Patience is a virtue. Are you not virtuous ?:-} ...Jim Thompson Competence is a virtue too. Are you competent? I suspect you've never done it, as you claimed you had, and you're still struggling and stalling. It's actually been "done" since around noon, but I've been hanging paintings and doing other honey-do tasks. ...Jim Thompson So, on Jan 7, when you said "it was calculated", you lied. It took you almost a week to figure it out. I didn't lie. I didn't have it all in a compact form, it required iteration... now it doesn't, see... You have never shown how you arrived at the values you posted, except to claim a calculation that you won't reveal. -- John Larkin Highland Technology Inc www.highlandtechnology.com jlarkin at highlandtechnology dot com Precision electronic instrumentation |
#40
Posted to sci.electronics.design,alt.binaries.schematics.electronic,sci.electronics.cad,sci.electronics.basics
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High Side Driver - Interesting Tidbits
On Sun, 12 Jan 2014 08:35:18 -0700, Jim Thompson
wrote: It appears the only valid data point for these power MOSFET's is the "total gate charge", Qg. The capacitances listed are useless for switch applications... their only value would appear to be if you were designing an RF amplifier. But here's the useful part... Cgeffective = 2*Qg/Vg This is the effective capacitance you must drive to reach your desired Vg. (Caution, use the Qg graph, not anything in a table... Qg increases with Vg.) Even the schmuck-in-chief should find that useful :-} ...Jim Thompson Not completely useless. Qg includes Cdg contribution; you'll note that the initial drain voltage has to be specified, for Qg limits. The plateau on Qg accumulation occurs at the gate switching threshold..... RL |
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