I have an application that frequently experiences catastrophic VBUS shorts when powering up the controller that destroys the MOSFETs and the controller. It appears that the outputs of the gate drivers are open-circuited when in UVLO but I did not see any reference to gate-source resistors. In our application, we are driving a Peltier module for heating and cooling purposes that is essentially non-inductive, mostly resistive and capacitive. I have the deadtime set to the maximum of 2us.
I have seen anti-shoot through circuitry on the DRV8770 motor controller evaluation design that includes a gate-source resistor on each MOSFET. We are not using any anti-shoot through circuitry since we are relying on the programmed 2us deadtime.
Do we need to use gate-source resistors on the MOSFETs?
Here is the basic schematic or our design:
Thank you,
David
