Part Number: TMCS1126-Q1
Other Parts Discussed in Thread: TMCS1126
We are using the TMCS1126 for an LLC power converter. There are many of these sensors used on the PCB: on DC lines for both input/output ports and for tank currents on primary/secondary sides of the transformer. They are all coupled together on a ground plane on the low voltage / output side of the sensor.
We are seeing false overcurrent events from this sensor. The current is below its OC threshold, but the OC output occasionally goes low at high power levels.
It does not rapidly go low, as expected, but rather decays over a period of about 20us.
See green waveform OC_Sec below.
Note: the OC pullup resistor is 10K Ohm
We are wondering if this behavior might be caused by common mode noise across the isolation boundary.
Please advise.
