DRV8303: C phase low side output(GL_C) doesn't have output

Li Fu47

Part Number: DRV8303

Hi ,

I am using drv8303 control 48V BLDC. The current status is no load. It's only 0.3A current. I am trying to adjust PWM duty cycle to control speed. But the Phase C lower side doesn't have output after the motor is running for a while.

Attached the DRV8303 schematic parts. Could you help me to find the reason?

Thanks,

over 5 years ago

0 Adam Sidelsky over 5 years ago

TI__Guru 61190 points

Li,

Have you tried this on a second device or board? I don't see why Phase C LS would stop working.

Regards,

-Adam

0 Li Fu47 over 5 years ago in reply to Adam Sidelsky

Prodigy 130 points

Hi Adam,

Thanks for your replying. Yes, I tried 5 devices. Most of the time Phase C stopped working first and then Fault/GVDD_UV happened. Could you give me some hints how to prevent this happen?

Thanks,

0 Li Fu47 over 5 years ago in reply to Li Fu47

Prodigy 130 points

Hi Adam,

I found the issue. The commutation table disordered. Then clamped too much energy to the lower sides and then damaged the driver.

Thank you.
Li

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DRV8303: C phase low side output(GL_C) doesn't have output