I am building a brushless motor controller for a motor rated at 60V and 80A using DRV8302 to drive the MOSFETs. We are are having some issues with the PVDD, GVDD and AVDD outputs on the DRV8302. We soldered and tested in the following conditions: Room temperature ~20C, chip soldered with solder paste and a hot air gun maxing out at 200C (we did not follow the soldering curve properly)
What's Working:
- The buck converter seems to be working fine. It gives us about 5.3V on output which is a little high but gets better under small loads.
- The PWRGD, FAULT and OCTW are all high, indicating no issues with the buck converter or the motor controller
What's Not Working:
- GVDD, AVDD pins output 0V even when we run a
- No gate voltage (GH_A, GL_A, GH_B, etc...) when we apply a 0V-5V PWM at 50% Duty Cycle through with H1 M_PWM set high
Things We Are Not Sure About:
- CP1/CP2 outputs 0V
- Our SS_TR is currently floating. Is this okay or does there have to be a cap to GND here?
- BST_BK is an unstable 11V
- RT_CLK is a stable 0.475V (is this good or bad?)
Any help would be good. You can find our circuit board design here for reference github.com/.../MotorController