Gate Drive Transformer Design

Two of the critical components to control when designing a gate drive transformer are the leakage inductance and distributed capacitance.

Gate drive transformer design.

Gate drive transformers typically provide worse rise and fall times than other drivers but due to the resonant nature of the tesla coil this is less important than in other applications. A special section deals with the gate drive requirements of the mosfets in synchronous rectifier applications. The final design would be greatly simplified if he could meet the requirements using single turn windings. The basic gate drive transformer has several design varia.

Procedure for ground referenced and high side gate drive circuits ac coupled and transformer isolated solutions are described in great details. Coilcraft has pre designed off the shelf gate drive transformers in a range of volt time product ratings isolation ratings and turns ratios. Gate drive transformers gts are a key component in many modern electronic systems. Some common schematics and their corresponding turns ratios are listed in fig.

Assum ing optimal values for rise time droop and overshoot the application is what discriminates the gate drive transformer from other transformers. This article discusses several gdt design considerations as well as ideal applications for their use. All of our gate drive transformer products are rohs compliant and come in multiple winding configurations. Our surface mount smt gate drive transformers feature basic and functional insulation and are available in various package sizes.

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. Some of the common core packages are ee eer etd and efd. High isolation transformer manufacturing design. The basic gate drive transformer has several design variations each of which is determined by the specific application.

Several important factors need to be considered when designing an optimized gate drive transformer gdt. Typical gate drive transformers are designed using ferrite cores to reduce cost. For more information see the overview for mosfet and igbt gate drivers product page. Gate drive transformers are essentially pulse transformers that are used to drive the gate of an electronic switching device.

The leakage inductance must be low. How do i select the best coilcraft gate drive transformer for my application. Based on a single turn he calculated the core area needed and then went looking for a core. In order to design a good gate drive transformer several things must be necessary.