High Side Mosfet Driver Pulse Transformer

A pulse transformer is an isolation transformer which can operate at speeds often needed for half bridge gate driver applications up to 1 mhz.

High side mosfet driver pulse transformer.

High side isolation 600 v is reached within the silicon. It has been optimized for both capacitive load drive and pulse transformer demagnetization. High side driver supply bootstrap supply is requested. A gate driver ic can be used to deliver the high currents needed for charging the capacitive mosfet gates.

Circuit block diagram it can therefore directly drive a low side switch and through a pulse transformer an high side switch. Procedure for ground referenced and high side gate drive circuits ac coupled and transformer isolated solutions are described in great details. The td300 is a three channel mosfet driver with pulse transformer driving capability. Gate charge of the mosfet to be driven bias voltage allowed ripple and discharge during switching switching frequency maximum high side pulse width minimum low side pulse width.

The yellow trace shows the voltage drop when the mosfet turns on and then when it closes the voltage climbs again and oscillates. A special section deals with the gate drive requirements of the mosfets in synchronous rectifier applications. Noise immunity negative voltage robustness of the high side driver. Its low buffer rds on can.

Here s a scope grab showing the pulse from the driver and the voltage on the mosfet side of the transformer. The blue trace is the gate and shows the 1 duty cycle i was using at this point.