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#1
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Zener Diode Protection - VoltageLimiter_SED.pdf
On Sun, 05 Jun 2011 13:23:01 -0500, John Fields
wrote: On Fri, 3 Jun 2011 08:17:31 -0700 (PDT), john1987 wrote: Hi, The input voltage is 5 volts and can go up to 60 volts but it might get more than that too. I do not know how much but so far the maximum limit is 60 volts. The load at the output of the DC to DC converter needs 3.3 volts and 100mA. The DC to DC converter can be configured to do that. I need some circuit zener or something that can protect the DC to DC converter if the voltage exceeds more than 40 volts or to be safe 38 volts. The minimum input to the DC to DC converter to produce 3.3 volts is 4.2 according to data sheet. But I have seen that if the voltage is 3.7 volts than the output gets very close to 3.3 volts and my circuit works. The protection circuitry should not let the input voltage go higher than 38 or 40 volts and DC to DC converter should be working all times. Thanks John --- He Version 4 SHEET 1 1268 804 WIRE -688 -256 -784 -256 WIRE -560 -256 -688 -256 WIRE -432 -256 -560 -256 WIRE 16 -256 -432 -256 WIRE 112 -256 16 -256 WIRE 160 -256 112 -256 WIRE 304 -256 256 -256 WIRE 464 -256 304 -256 WIRE 16 -240 16 -256 WIRE 400 -240 320 -240 WIRE -688 -224 -688 -256 WIRE -560 -224 -560 -256 WIRE -432 -224 -432 -256 WIRE 304 -224 304 -256 WIRE 400 -208 400 -240 WIRE 112 -192 112 -256 WIRE 16 -144 16 -176 WIRE 16 -48 16 -80 WIRE 112 -48 112 -112 WIRE 112 -48 16 -48 WIRE 176 -48 176 -208 WIRE 176 -48 112 -48 WIRE 400 0 400 -16 WIRE 400 0 320 0 WIRE 304 48 304 -144 WIRE 304 48 -368 48 WIRE -688 80 -688 -144 WIRE -304 80 -688 80 WIRE -208 80 -304 80 WIRE -128 80 -208 80 WIRE 176 112 176 -48 WIRE 400 112 400 0 WIRE -304 128 -304 80 WIRE -368 144 -368 48 WIRE -336 144 -368 144 WIRE -32 160 -272 160 WIRE 112 160 48 160 WIRE -560 176 -560 -144 WIRE -336 176 -560 176 WIRE 400 304 400 192 WIRE 400 304 320 304 WIRE -128 352 -128 80 WIRE 176 400 176 208 WIRE 176 400 48 400 WIRE 48 432 48 400 WIRE -208 448 -208 80 WIRE 400 448 400 304 WIRE -432 464 -432 -144 WIRE -240 464 -432 464 WIRE -128 480 -128 432 WIRE -128 480 -176 480 WIRE -16 480 -128 480 WIRE -560 496 -560 176 WIRE -240 496 -560 496 WIRE 176 512 176 400 WIRE 304 512 304 48 WIRE -432 528 -432 464 WIRE -784 544 -784 -256 WIRE -688 544 -688 80 WIRE -560 544 -560 496 WIRE -784 672 -784 624 WIRE -688 672 -688 608 WIRE -688 672 -784 672 WIRE -560 672 -560 608 WIRE -560 672 -688 672 WIRE -432 672 -432 608 WIRE -432 672 -560 672 WIRE -304 672 -304 192 WIRE -304 672 -432 672 WIRE -208 672 -208 512 WIRE -208 672 -304 672 WIRE 48 672 48 528 WIRE 48 672 -208 672 WIRE 176 672 176 592 WIRE 176 672 48 672 WIRE 304 672 304 592 WIRE 304 672 176 672 WIRE 400 672 400 512 WIRE 400 672 320 672 WIRE -784 720 -784 672 FLAG -784 720 0 FLAG 464 -256 Vout SYMBOL voltage -784 528 R0 WINDOW 3 24 104 Invisible 0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 SYMATTR Value PULSE(0 60 0 .005) SYMATTR InstName V1 SYMBOL pmos 256 -208 M270 SYMATTR InstName M1 SYMATTR Value FQB11P06 SYMBOL res -576 -240 R0 SYMATTR InstName R3 SYMATTR Value 5k1 SYMBOL References\\LT1009 -560 576 R0 SYMATTR InstName U2 SYMBOL res 288 -240 R0 WINDOW 0 -52 47 Left 0 WINDOW 3 -64 72 Left 0 SYMATTR InstName R4 SYMATTR Value 30.1k SYMBOL res 288 496 R0 WINDOW 0 -56 37 Left 0 WINDOW 3 -64 71 Left 0 SYMATTR InstName R5 SYMATTR Value 2320 SYMBOL zener -672 608 R180 WINDOW 0 -39 31 Left 0 WINDOW 3 -81 3 Left 0 SYMATTR InstName D1 SYMATTR Value DFLZ33 SYMBOL npn 112 112 R0 SYMATTR InstName Q1 SYMATTR Value BC546B SYMBOL res 96 -208 R0 WINDOW 0 -40 40 Left 0 WINDOW 3 -42 73 Left 0 SYMATTR InstName R1 SYMATTR Value 10k SYMBOL res -704 -240 R0 SYMATTR InstName R6 SYMATTR Value 1000 SYMBOL Opamps\\LT1007 -304 96 R0 SYMATTR InstName U3 SYMBOL res 160 496 R0 WINDOW 0 -40 47 Left 0 WINDOW 3 -51 78 Left 0 SYMATTR InstName R7 SYMATTR Value 1000 SYMBOL npn -16 432 R0 SYMATTR InstName Q3 SYMATTR Value 2N3904 SYMBOL res -448 -240 R0 SYMATTR InstName R9 SYMATTR Value 100k SYMBOL res -448 512 R0 SYMATTR InstName R10 SYMATTR Value 100k SYMBOL Comparators\\LT1716 -208 480 R0 SYMATTR InstName U4 SYMBOL res -144 336 R0 SYMATTR InstName R8 SYMATTR Value 10k SYMBOL res 64 144 R90 WINDOW 0 0 56 VBottom 0 WINDOW 3 32 56 VTop 0 SYMATTR InstName R11 SYMATTR Value 10k SYMBOL zener 32 -176 R180 WINDOW 0 46 33 Left 0 WINDOW 3 22 -3 Left 0 SYMATTR InstName D2 SYMATTR Value BZX84C12L SYMBOL zener 32 -80 R180 WINDOW 0 46 31 Left 0 WINDOW 3 26 -10 Left 0 SYMATTR InstName D3 SYMATTR Value BZX84C12L TEXT -768 696 Left 0 !.tran 0 .01 0 1e-6 startup uic TEXT 352 480 Left 0 ;STARTUP TEXT 336 152 Left 0 ;36V SERVO TEXT 328 -176 Left 0 ;SERIES PASS TEXT 336 -144 Left 0 ;REGLATOR TEXT 368 -112 Left 0 ;AND TEXT 328 -80 Left 0 ;GATE-SOURCE TEXT 360 -48 Left 0 ;CLAMP Too complex, see attachment... ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 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
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Zener Diode Protection - VoltageLimiter_SED.pdf
On Sun, 05 Jun 2011 12:20:34 -0700, Jim Thompson
wrote: Too complex, see attachment... ...Jim Thompson --- Something's wrong. With a 5V supply, how can you expect to get 5V out of an emitter follower? -- JF |
#3
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Zener Diode Protection - VoltageLimiter_SED.pdf
On Sun, 05 Jun 2011 15:09:06 -0500, John Fields
wrote: On Sun, 05 Jun 2011 12:20:34 -0700, Jim Thompson wrote: Too complex, see attachment... ...Jim Thompson --- Something's wrong. With a 5V supply, how can you expect to get 5V out of an emitter follower? The OP said his device was guaranteed at 4.2V and seemed pretty good down to 3.7V ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 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
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Zener Diode Protection - VoltageLimiter_SED.pdf
On Sun, 05 Jun 2011 13:12:04 -0700, Jim Thompson
wrote: On Sun, 05 Jun 2011 15:09:06 -0500, John Fields wrote: On Sun, 05 Jun 2011 12:20:34 -0700, Jim Thompson wrote: Too complex, see attachment... ...Jim Thompson --- Something's wrong. With a 5V supply, how can you expect to get 5V out of an emitter follower? The OP said his device was guaranteed at 4.2V and seemed pretty good down to 3.7V ;-) ...Jim Thompson --- The OP doesn't know what the **** he's talking about, and is basing his 3.7V data on non-guaranteed characteristics of a single device he's dicking around with. Even with that, the data for your circuit shows that with 5V out of the bulk supply he'll get about 2.5V into the switcher, which won't work, for sure. With my excellent "P" channel pass device design, , 5V out of the supply will get him 4.95V into the switcher. More parts than yours, for sure, but mine works down to the bitter end. -- JF |
#5
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Zener Diode Protection - VoltageLimiter_SED.pdf
On Sun, 05 Jun 2011 16:54:12 -0500, John Fields
wrote: On Sun, 05 Jun 2011 13:12:04 -0700, Jim Thompson wrote: On Sun, 05 Jun 2011 15:09:06 -0500, John Fields wrote: On Sun, 05 Jun 2011 12:20:34 -0700, Jim Thompson wrote: Too complex, see attachment... ...Jim Thompson --- Something's wrong. With a 5V supply, how can you expect to get 5V out of an emitter follower? The OP said his device was guaranteed at 4.2V and seemed pretty good down to 3.7V ;-) ...Jim Thompson --- The OP doesn't know what the **** he's talking about, and is basing his 3.7V data on non-guaranteed characteristics of a single device he's dicking around with. Even with that, the data for your circuit shows that with 5V out of the bulk supply he'll get about 2.5V into the switcher, which won't work, for sure. With my excellent "P" channel pass device design, , 5V out of the supply will get him 4.95V into the switcher. More parts than yours, for sure, but mine works down to the bitter end. Of course. I left the fine details of mine as an exercise for the student ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 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. |
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