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DRV8844 bulk and bypass capacitors?

loz
Prodigy 10 points
Other Parts Discussed in Thread: DRV8844

Hello,

I would to use DRV8844 in my application. I have two questions.

1. In datasheet TI wrote : VM - Bypass to VNEG with a 10-μF (minimum) capacitor. But in evaluation board VM capacitors is 0.1uF and bulk capaciotor is 100uF.

2. In my application I use DRV8844 to drive two bistable latched relay coil. The coil have 100 Ohm and voltage range 40V-58V. The maximum drive time is 1s and maksimum period 2s. Please tell me, how big bulk capacitor i need to use? The input source power is good quality (battery supply).