Hi team,
Issue: the device(DRV8353S) is damaged after a phase-to-phase short of the driver. It's found damage to one phase lower bridge short detection circuit, and the nFAULT signal is reported to be low as long as current passes through the lower bridge.
What could cause damage to the circuit for short-circuit detection? Are some parameters of the short circuit detection circuit exceeded?
Could you help check this case? Thanks.
Best Regards,
Cherry
Akshay, thanks!
• What I drive setting are you using?
---see below photo.
• What dead time is being used?
---The dead time is 400ns
• What is the standard motor current and motor voltage?
---motor voltage 48V/20A
• What specific pin has failed?
---The lower bridge short circuit detection circuit with one phase is damaged, There's only current going through.
Some are three-phase current no output, VGL pin output voltage error, VCP pin output voltage error.
Hi Akshay,
1. It's the voltage of the VGLS
2. There is no damage on VGLS and VCP surfaces
3,.the bootstrap voltage output voltage is not right, the feeling may be the bootstrap circuit is broken, it is possible that other circuits are broken, indirectly leading to the bootstrap circuit has a problem, at present can be clear: there is a phase of the bridge short circuit detection circuit damaged
4. There should be no short line between SPX and SHX, because they go to different layers
5. The picture is part of the schematic diagram and PCB diagram (our power circuit and DRV driver circuit are not on the same board, but two boards are stacked together and connected through the row needle)
