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DRV8432 - external boot voltage
is it possible to feed an external boot voltage into DRV8432 to overcome this effect of switching off MOSFET recharging boot cap?
I've done so with a discrete H-bridge (4 MOSFETs + 2 MOSFET drivers).
I've used an auxillary voltage which was about 16 V higher then the supply voltage of the H-bridge.The boost voltage was recharged over an 100 kOhm current limiting resistor from this auxillary voltage.A Zener-diode in parallel to the boost capacitor limits the boost voltage.
With this configuration I was able to use the H-bridge in static conditions.
I don't know if this solution is practical for the DRV8432.In the datasheet I could not find how much current the device will draw from the BST_x pin.Perhaps the current limiting resistor must dissipate to much energy if the device draws a nameable current from the BST_x pins...
I'm also considering to use the DRV8432 in such a way.
Please let me know if you have some new information.
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