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DRV8835 failure after some time of operation

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Hi!

First of all I want to admit that I haven't any experience in motor drivers circuts design. 

I'm using DRV8835 to control 2 brushed DC motors with 1.6A stall current. Motors are used to wirelessly drive toy car so there are possibilities of fast changing of current directions. After some time of intensive operation toy loses its ability to ride and changing DRV8835 chip solves the problem. That happend two times already. Schematic is below. Vbat = 7.5V.

Am I right to think that this happens because reverse motor current even higher then 1.6A and overcurrent protection doesn't save the chip?

Am I right to think that slowing of acceleration will solve the problem? Also how can I design motor driver which can successfully handle this overcurrent whithout slowing an accelaration?


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