Hello Team,
is it possible to feed an external boot voltage into DRV8432 to overcome this effect of switching off MOSFET recharging boot cap?
Best Regards
Josef
Hello Josef,
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.
Regards, Florian