omid2006
Junior Member level 2
Hi guys. I faced a problem while I was trying to read current by a shunt resistor and HCPL7840 opamp. the voltage at each of the hcpl7840 input pins is 36V(my supply voltage is 36V). but when I turn my supply on, HCPL punched and burnt terribly. I've tried this with 2 other hcpls but the result was same. I faced a paradox in HCPL datasheet maximum voltage of Vin+,Vin- is VDD+0.5. but It's recommended to use it for motor current sensing application. the motor phase voltage is high not 5V!. so what's wrong. please help me if someone have similar experience.