Other Parts Discussed in Thread: DRV8301
Motor : 2*250W BLDC
Drive way: 3 Hall sensors and H-PWM-L-ON;
Summer
If you find out this conference,please read this paragraph carefully.
If you find your drv830x device was reset automatically(or find the device would recover by itself) ,and you have check all the vol that is normal, you could check whether you connect the AGND and POWER PAD directly. You should connect the two pin as short as you can.
Maybe I hope the discusion below would give you more thinking direction to solve problem.
The issue is the motor running normally in case of light load, but when the load turns heavy, the motor sound big noise and the waveform is abnormal. Just like the pic below. The white rectangle indicates the question, the all gate of FET have been pulled down .However, It should be PWM.
what I have check:
1. Fault pin report the error , in line with the area of white rectangle; At the same time ,the OCTW pin kept high; then read the status reg which is 0xff (It is weird) .
2. The PWM input between MCU - > DRV8303 is OK;
3. I have check the PVDD\DVDD\AVDD\GVDD twice and did not found any unusual;(the cap near power pin follow the pdf)
4. the C- Vds waveform may have some mistake, but I didn't know clearly;
5. When the error occurd, the phase current was about 16A. The internal resistance of FET was about 3.8mohm, the max current allows 80A.
6. It also seems EN-GATE was OK;
7. I have 4 PCB boards(two layout ways), every board have the same phenomenon. The left driver is almost OK, and check the waveform could see some error. The right driver is serious.
8. I have disabled the OC detect. And set the OC_Adj is 31(2.4V);
