Hi Team:
Nowadays, we are try to measure the current of the LED based on a sensor resistance and differential amplify circuit. The schematic is below. The Vcc for TLV9001 is 4V stable. R5=R7=18K, R6=R8=100K Rsense=1Ω. When we use a power supply as 50mA current source for the Vdrive. The voltage between Rsense is 50mV, while Vdrive is close to 2.5V. But there is no Vout from the TLV9001.
We have measured the voltage of IN+: 2.26V, IN-:2.23V. But for Vout, there is only 10mV. And after I add 0.1uF both IN-, IN+, 10uF at VCC, Vdrive. there is no change.
May you help to find out why the circuit couldn't work. Is the circuit right? Or we may need to add some caps some where? Thanks for your kindly support~
Best Regards
Minqiu
