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Part Number: DRV8703-Q1
We had a situation where a DRV8703-Q1 was killed our application. We observed overvoltage spikes at the terminals SH1 and SH2, caused by the DC motor, connected to OUT1 and OUT2. We assumed that this was the reason for the malfunction and we added two simple 1k resistors in series to the inputs SH1 and SH2 (see R1314, R1315 in schematic below). Interestingly, the DRV8703 does not work with these resistors - using 10R resistors works well. It seems that the current flowing into SH1 and SH2 is larger than expected (input current of these pins is not given by the datasheet).
Are there any hints how to dimension a series resistor for SH1 and SH2? Or are there any other ways how to protectthe inputs SH1 and SH2 against overvoltage?
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