Mosfet Gate Drive Transformer Design

Some of the common core packages are ee eer etd and efd.

Mosfet gate drive transformer design.

A gate drive transformer is optimized for transmitting rectangular electrical pulses with fast rise and fall times to activate or deactivate a switching device. The transformer drive circuit accelerates the turn off of mos transistor. The dielectric isolation of the transformer should be able to withstand at least twice the input voltage. A special chapter deals with the gate drive requirements of the mosfets in synchronous rectifier applications.

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 special section deals with the gate drive requirements of the mosfets in synchronous rectifier applications. Was asked to design a gate drive transformer capable of driving two mosfets at 1mhz with a 15ns pulse width. Coilcraft s off the shelf gate drive transformers simplify the design of your gate drive circuit and shorten design cycle time.

For a ground referenced floating drive keep 500 v isolation if a 400 v pre regulated pfc exists. What is a gate drive transformer. Current through a mosfet between drain and source is controlled by a drive voltage applied to the mosfet gate. High side mosfet drive circuit.

Several step by step numerical design examples complement the paper. For more information see the overview for mosfet and igbt gate drivers product page. Procedure for ground referenced and high side gate drive circuits ac coupled and transformer isolated solutions are described in great details. This gate drive transformer gdt circuit allows the drive signal to the mosfet to range from 50 down to 0 while still offering a fast turn off that cannot be accomplished with a simple load.

General gate drive transformer attributes. In order to meet the requirements of driving the high side mos transistor as shown in figure 5 transformer drivers are usually used and sometimes they are used for safety isolation. Design procedure for ground referenced and high side gate drive circuits ac coupled and transformer isolated solutions are described in great details. Triple insulated wire must be used for more than 3 kv isolation requirements.

This article highlights ice components incorporated gate drive transformers which used to drive the gate of metal oxide field effect transistors mosfets. 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. The basic gate drive transformer has several design variations each of which is determined by the specific application.