I replaced a broken DRV8302 after a fail of my VESC. However even though I soldered the bottom GND PAD Properly (i put solder paste on it and reflowed everything and pressed it down firmly) I have some issues.
I changed the DRV8302 3x already to different new parts… made sure the bottom GND is soldered… I also replaced the STM32F405 and flashed it again with STLink. But I still only measure 1.8V on the 5V Rail from the DRV Chip.
Anyone please have a hint ?
Also I tested the PCB with a 18V Lab Supply… it will draw around 0.9A and when I use the 18V Supply the 5V Rail will show 7.5V - however when using the 44V LiPo it will show only 1.8V. It’s very strange… The V_SENSE resistors and all the pins connections seem correct What could be the problem ?
Thanks for the help