High Speed Isolated Mosfet Gate Driver

For more information see the overview for mosfet and igbt gate drivers product page.

High speed isolated mosfet gate driver. A magnetically isolated gate driver for high speed voltage sharing in series connected mosfets anthony philip epe 2011 birmingham isbn. 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. 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. 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.

Using a design that inherently minimizes shoot through current ucc2752x can deliver high peak current pulses of up to 5 a source and 5 a sink into capacitive loads along with rail to rail drive capability and extremely small propagation delay typically 13 ns. Isolated gate drivers 49 low side drivers 115 lcd oled display power drivers 80 led drivers 355 automotive led drivers 82 backlight led drivers 85 flash led drivers 35 general lighting led drivers 61 rgb white led drivers 44 signage led display drivers 48 linear regulators ldo 597 mosfets 232 n channel mosfet. In many cases driving a larger power mosfet igbt directly with a microcontroller might overheat and damage the control due to a possible current. 9789075815153 p 1 for circuits in the second group the change in drain source voltage of one device triggers the gate of the device above it and thus the devices switch sequentially 1 8 9.

High common mode transient immunity cmti. 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. A special section deals with the gate drive requirements of the mosfets in synchronous rectifier applications.

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. Isolated gate drivers enable low voltage microcontrollers to safely switch high voltage power transistors on and off. High switching speeds t r and t f 14 ns typ are obtained with the use of bicmos outputs. Safe switching of high speed silicon carbide sic and gallium nitride gan transistors places an extra requirement on isolated gate driver ics.

Procedure for ground referenced and high side gate drive circuits ac coupled and transformer isolated solutions are described in great details.