DRV8860: Open circuit protection problem

jeno.zhang

Expert 1815 points

Part Number: DRV8860

Hello，

1. Please check whether the schematic design of the accessories is reasonable?

2. The two DRV8860 are not connected to the load. Why is the FAULT pin not pulled down?

3. How to test the open circuit protection function?

0 Jacob Thompson over 1 year ago

Hello,

You need a pull-up resistor on the nFAULT pins. It is an open-drain output. Recommend 10K.

See 8.3.3.2

For your schematic, I would toggle J4 (manual valve) and see if OLD detects on U10. Or disconnect the load on OUT4.

Regards,

Jacob

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