Other Parts Discussed in Thread: OPA197
Hi Support team
there is server PSU application, OPA209 was used in output current measurement, while turning off the 12V main output, only the standby output, in this condition, VCC is maintaining to 18V but there is no voltage on 12VL & 12VZ.
CH1 is the signal that IC250_Pin1 output is divided into MCU (UC_12V_ILocal), so the actual IC250_Pin 1 output will be larger than CH1.
CH2 is an Alert signal. When the MCU detects that the voltage of CH1 is greater than a certain level, it will pull low.
in case, we can observed that the abnormal waveform's CH1 single will goes high (around 2V) to trigger the alert signal but the normal one is 350mV only,
the failure rate is 8/900, and after process the FA, the return IC was passed the ATE
need your kindly help to check it and give some advice
current shunt resistor
CH1 is OPA209 PIN 1