High Speed Isolated Mosfet Gate Driver

Safe switching of high speed silicon carbide sic and gallium nitride gan transistors places an extra requirement on isolated gate driver ics.

High speed isolated mosfet gate driver.

High common mode transient immunity cmti. Galvanic isolation is attained using a high voltage on chip micro transformer that ensures commands and diagnostic information are reliably transferred to and from the floating with respect to ground section of the circuit. Procedure for ground referenced and high side gate drive circuits ac coupled and transformer isolated solutions are described in great details. St offers the stgap series of isolated mosfet and igbt gate drivers that provide galvanic isolation between the input section which connects to the control part of the system and the mosfet or igbt being driven.

Isolation robustness and higher power density is realized by integrating the isolator with a key power component. A magnetically isolated gate driver for high speed voltage sharing in series connected mosfets anthony philip epe 2011 birmingham isbn. Isolated gate drivers enable low voltage microcontrollers to safely switch high voltage power transistors on and off. The ucc2752x family of devices are dual channel high speed low side gate driver devices capable of effectively driving mosfet and igbt power switches.

Our isolated gate drivers are available in basic functional and reinforced isolation and accept a low power input from a controller ic to produce the appropriate high current gate drive for a mosfet igbt sic or gan power switch. The tps28xx single channel high speed mosfet drivers are capable of delivering peak currents of up to 2 a into highly capacitive loads. A special section deals with the gate drive requirements of the mosfets in synchronous rectifier applications. For more information see the overview for mosfet and igbt gate drivers product page.

As seen in figure 3 transition time reduces significantly with an adum4121 isolated gate driver which provides much higher drive current than a microcontroller i o pin drives the same power mosfet. The integrated high speed isolated gate driver. Robust strong and precise single and dual channel isolated gate driver ics for mosfets igbts igbt modules sic mosfets and gan hemts eicedriver galvanically isolated gate drivers use the magnetically coupled coreless transformer ct technology to provide signal transfer across the galvanic isolation. In many cases driving a larger power mosfet igbt directly with a microcontroller might overheat and damage the control due to a possible current.

High switching speeds t r and t f 14 ns typ are obtained with the use of bicmos outputs.