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I am trying to turn off my N-channel MOSFET which is driven by a charge pump.

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It takes too long to discharge the pump through the gate-resistor to ground, therefore the power dissipation is very high.

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Any advice to lower the amount of time it takes to turn the MOSFET off?

Downsizing the charge pump and the resistor both leads to a shorter time, but then the charge pump can't reach its potential voltage.

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1 Answer 1

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Actively discharge C2

schematic

simulate this circuit – Schematic created using CircuitLab

Assuming you switch the charge pump on and off with some sort of logic, derive the off control as the complement of that.

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