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RE: DRV8870 REF input voltage at PWM without current regulation

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Shimizu-san, if the DRV8870 VREF input is grounded, the ITRIP formula goes to zero, and the device won't drive much current.

A good solution here is to use the DRV8872 instead.  It has an internal "3.5V VREF", and instead of having a VREF pin there's an open-drain fault status output.  nFAULT can be left unconnected if you don't need to monitor it.

Best regards,
RE


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