Hi,
We are using LPV821 in a current sensing application in our dimmer design. Below the differential amplifier configuration we used to amplify the very low voltage drop across the 10 milliOhm resistor.
The output of this configuration is 3.3V (Vcc). But when we use LM321 in the place of LPV821 then the output is as expected.
Why the differential configuration of LPV821 is not working as expected? Please help on this.
Hi Vivek,
Please consider that for "the very low voltage drop across the 10 milliohm resistor" with Vref=0, output approaches 0V that may violate LPV821 output range: Vout>(V-)+0.1V
Thus, with LPV821 rail-to-rail input and output vs non-RRIO LM321 (see below) it's hard to believe that LM321 would work better in your application than LPV821 UNLESS you violate the output swing or input common-mode voltage ranges shown below. For these reason to answer your question we need to know the input voltages with respect to ground.
