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DRV8302 Fault signal

Chinmay Shah
Expert 1085 points
Other Parts Discussed in Thread: DRV8302, TMS320F28035

Dear Friends,

I have used DRV8302, as an MOSFET Driver, in my design for BLDC Motor Control Board. 

We are generating 6 PWM signal from MCU (TMS320F28035), but we can't get output PWM pulses from DRV8302, due to FAULT pin = 0V, as it's active low. 

Also in my circuit, the voltage level at pin GVDD (internal gate driver regulator) is around 0.7V instead of around 10V. 

I have done following things:

  1. toggle En_Gate pin (which is pull down with 1K resistor),
  2. tied GVDD pin with OC_ADJ pin to disable Over Current Trip via 100K resistor. 
I think, if I get proper voltage level at pin GVDD, then FAULT will be removed. Because, as I make En_Gate pin = 1, from watch window, immediately FAULT pin = 1, but as I apply En_gate = 0, Fault will be = 0.7V approx.  
I don't know is it correct forum or not! please help me