Ladies and gentlemen,
we would like to use the DRV8701P for our serial products. We want to control different DC motors and keep them constant over their entire speed range with regard to the speed. For this purpose, we measure the returned EMF voltage and give it to a SW controller, which in turn sets the PWM ratio. Unfortunately, however, it is the case that the DRV8701P chip sends back approx. 0.7V EMF voltage even at standstill and we cannot distinguish this voltage level from a low speed. In earlier discrete designs, we grounded an N-channel MOSFET so that the EMF voltage was always positive. The DRV chip does not allow this. Is there a standard application for measuring the EMC voltage?
Thank you for an answer that decides whether we can use the DRV chip.
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