Hello,
I know the DRV8304S comes with a charge pump to drive high side MOSFETs and that the VCP pin gives us the charge pump output.
I would like to use that voltage (~ VM+13.5) to drive a different MOSFET (not one of the half bridge MOSFETs).
Can I connect VCP to the MOSFET gate directly? Are there any design recommendations that must be followed if I am using the VCP as input to a MOSFET?
Thanks and regards,
Vishnu
Edit: Meant VCP in the title, not CPH.
Hi Vishnu,
VCP only supports 15mA in DRV8304. It can be used to drive an external MOSFET such as an active supply cutoff switch or reverse polarity protection, but you'll need to be very careful about the average amount of current from VCP based on your MOSFET switching.
I would use small IDRIVE settings, MOSFETs with low Qg value, and smaller PWM frequency (like 20kHz) to try and minimize load on VCP current in order to drive an external MOSFET.
Thanks,
Aaron
