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UCC21750: Reg Fault pin

Part Number: UCC21750

Hi

Would like to know, at what are condition fault pin will be triggered

We have clamped the DESAT pin to ground with 10K and disabled the DESAT function

Still we are getting the Fault pin triggered

Also Fault pin returning back to high state without giving reset the EN pin and we are getting the PWM from OUT pins

As per datasheet if fault pin triggered it will be in low state till the EN pin is reset 

Please help us to identify the issue