DRV8425: NFault low after power up, DVDD 0.2V, VM=24V

Cherry Zhou

Part Number: DRV8425
Other Parts Discussed in Thread: DRV8424EVM

Hi team,

The schematic is as above, could you help check the possible cause of this issue? Thanks.

Best Regards,

Cherry

0 Shinya Morita over 2 years ago

Hi Cherry,

Thank you for your question. We will review and feedback to you by Monday.

regards

Shinya Morita

0 Ryan Kehr over 2 years ago in reply to Shinya Morita

Cherry,

Can you please check the nSLEEP pin directly at the IC?

Also, The CPH/CPL cap is incorrect. It should be 22nF (0.022uF). It is 10x smaller than VCP cap.

Have they tried more than one IC?

Regards,

Ryan

0 Cherry Zhou over 2 years ago in reply to Ryan Kehr

Hi Ryan,

Thanks for your support.

Ryan Kehr said:
Can you please check the nSLEEP pin directly at the IC?

The nSLEEP pin of the IC is high, approximately 5.1V.

Ryan Kehr said:
Also, The CPH/CPL cap is incorrect. It should be 22nF (0.022uF). It is 10x smaller than VCP cap.

The capacitor has been replaced to 0.022uf during debug.

Ryan Kehr said:
Have they tried more than one IC?

3 ICs have been tried, but these 3 are the same batch.

Thanks and regards,

Cherry

0 Ryan Kehr over 2 years ago in reply to Cherry Zhou

Cherry,

Were the ICs ordered thru an approved distributor? Can you please send top side marking pictures?

Does the customer have an EVM? If so, they can place one of their samples on an EVM to verify operation. DRV8424EVM will support this device.

Regards,

Ryan

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