Part Number:DRV8302
Hello all,
A professor ask,
" I’m' working on the development of a BLDC motor driver and I'm using the DRV8302 as a gate driver. I dimensioned all of the external components according to the device datasheet using the webench_design online app for the internal buck components. I'm now facing the following problem,
I noticed that when the EN_GATE pin is set to high the nFAULT pin goes low. It does it most of the time but not always. I have examined DRV8302 datasheet. It says that nFAULT goes low in case of overvoltage of GVDD, under voltage of PVDD, DVDD, GVDD, in case of external FET overload and in case of over temperature. Now external FETs aren’t overloaded because the motor is disconnected, and there is no reason for over temperature. Also nOCTW is high.
There is no supply under voltage. Concerning the internal levels of the driver, they are generated only in case EN_GATE in set high (in this case as said nFAULT goes low) and they don't seem to be out of their max and minimum range. How could I solve it? "
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Could anyone help me with this please? I have attached the schematic design and partial layout of the resulting board (just the DRV layer).
Thank you in advance.