![]() ![]() ![]() A gate drive transformer isolates the controlling gate drive circuit from the switch node when driving the MOSFET gate, and may also scale the output voltage via an appropriate primary-to-secondary turns ratio. Gate driver circuits need an isolated (floating) bias supply to maintain the required turn-on bias when the FET source rises to the input voltage. This article discusses gate drive transformers and applications for which Coilcraft off-the-shelf gate drive transformers are best suited. Gate drive transformers are used to deliver the controlling pulses while providing isolation between the MOSFET and the controlling drive circuit. In switching power supplies a pulsed gate drive voltage turns the drain-source current on and off, operating the MOSFET as a current switch. A gate drive transorme r What is a gate drive transformer?Ĭurrent through a MOSFET between drain and source is controlled by a drive voltage applied to the MOSFET gate. ![]()
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