Home |
Search |
Today's Posts |
#1
|
|||
|
|||
Can I leave Vref pin on L6203 unconnected ?
On 4 Jan 2005 10:02:49 -0800, "alex" wrote:
I would always connect Vref on any circuit that is using a voltage or current feedback loop. According to the datasheet, Vref is an internal voltage reference. How it's being used isn't apparent, but more than likely it's used to control the op-amp(s) output based on your voltage input. You'll have to forgive my rusty EE knowledge. I've been in the IT world too long and out of the fun stuff. :P Your best bet is to contact the manufacturer and get more details on the chip and how the voltage reference is being used. You may be able to get by with leaving the pin unconnected, but I wouldn't recommend it. One thing you don't want to do is route it directly onto the board's ground plane. Ground loops and noise will wreck havoc. Thus, the capacitor is recommended if you are connecting it. -Glen Hello All, Could somebody please comment on a purpose of Vref pin in L6203. The datasheet recommends putting a bypass capacitor there, but does not say what will happen if I do not. All publicly available schematics I could find on the Internet seems to follow the datasheet recommendation and put a capacitor. I wonder if it is really necessary if I do not use that reference voltage at all? Omitting the capacitors would simplify my layout, because I am doing a single layer PCB. Thanks ahead. Kind Regards, Alex |
#2
|
|||
|
|||
"alex" wrote in message ups.com... Hello All, Could somebody please comment on a purpose of Vref pin in L6203. The datasheet recommends putting a bypass capacitor there, but does not say what will happen if I do not. All publicly available schematics I could find on the Internet seems to follow the datasheet recommendation and put a capacitor. I wonder if it is really necessary if I do not use that reference voltage at all? Omitting the capacitors would simplify my layout, because I am doing a single layer PCB. Thanks ahead. Kind Regards, Alex The V ref pin sets the internal thresholds for the protection and input levels- not connecting it will mean the circuit is more likely to suffer problems from noise in the surrounding circuits, and potentially damage whats connected to it- I don't know your application but good rule of thumb if the manufacturers go to the cost of routing it to the outside world on a pin do as they suggest and slap a cap to earth regards Anthony |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|