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Original question:

DRV8844: DRV8844

DRV8844: Schematic review and a few questions

Yue TANG
Expert 8485 points
Part Number: DRV8844

Hi,

Please help to check the schematic and help below questions. thanks. 

1. there are two 35v/47uF caps between VM+ and VM-, is this OK or if need to add a small filter capacitor

2.the Load is a valve, my customer  switched the EN and IN pin.  PWM was input to EN pin. Is this a right way?

  • 0
    TI__Guru 56650 points

    Yue,

    1. Please add few small filter ceramic capacitors near DRV8844 between +VM and -VM to reduce the EMI noise and reduce the ripple current on 47uF capacitors.

    2. ENx pin is the enable pin. If ENx is low, I would think both high side and low side FETs are off. So, I would add PWM signal to INx pin.