TS391

[ayoung]

Posted on November 09, 2016 at 00:22

I am having trouble making this part work. Since is fairly simple. I was wondering of the top of your head what are some reasons the output does not change according to the voltages on the input pin (I'm using a pullup resistor). For me the negative input is held at 2.5V and the positive input could be between 0V-3V but when I get above 2.5V the output does not change.

Thanks

#ts391rilt

[Nickname560_O]

Posted on November 14, 2016 at 11:21

Hello,

First idea could be than the schematic don't respect the maximum Vicm (Vcc-1.5V). For example if you use a 3V Vcc, maximum Vicm is 1.5V and can generate problem on input detection.  

Other idea is the Vio of 5mV introducing offset on reference voltage on negative input.

What is your configuration on each pin? Which state don't appear at 2.5V?

Bye