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DRV8243-Q1: nFault activated after startup

Part Number: DRV8243-Q1

Hi Team,

Can someone please help with below question?

I use a DRV8243 in HW PH/EN variant (there are a H marking on the chip). PWM is on IN1 and GND is on IN2. The voltage supply on VM is 31V.

After powered the board, the signal nFAULT try to achieve high sate logic but it fall instantly to low state logic. I tried to reset the default by shorting nSLEEP to GND but the same default occur. I also tried with or without motor plugged but the behavior is the same. On our connector to connect motor (signal SERRAGE_OUT- and SERRAGE_OUT+ on our schematic) I measured 400mV DC voltage on each pin.

The behavior is the same with or without PWM signal on IN1 pin.


You will find a schematic in attachment,


Thank you in advance for your help.