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Gate Driver ICs

International Rectifier's MOSFET

and IGBT gate driver ICs are the

simplest, smallest and lowest cost

solution to drive MOSFETs or IGBTs

up to 1200V in applications up to12kW, and can save over 30% in

part count in a 50% smaller PCB

area compared to a discrete opto-

coupler or transformer based

solution. With the addition of few

external components, IR gate

driver ICs provide full driver

capability with extremely fast

switching speeds, designed-in

ruggedness and low-power

dissipation.

Gate driver IC's generate thecurrent and voltage necessary toturn MOSFETs or IGBTs on and off

from the logic output of a DSP,micro-controller or other logicdevice. The input is typically a 3.3volt logic-level signal. All IR gatedriver ICs are CMOS compatible,and most are TTL compatible.Output currents are up to 2A.

Gate Driver ICs

THE IR ADVANTAGE

Dead-time as low as 500ns

allows frequency up to 100khz

Increases speed range and

torque control of motor drives

Enable rugged gate drive

design

Low power dissipation

Compared with opto-coupler

based solutions:

30% fewer parts and 50%

smaller PCB

Doesn't need auxiliary power

supply

10X faster delay matching

FEATURES AT A GLANCE

600V and 1200V gate driver in a single IC for MOSFET

and IGBTs

Multiple Configurations

Single high side

Half-bridge

3 phase inverter driver

Up to +2.0/-2.0A output source/sink current enables fast

switching

Integrated protection and feedback functions

Optional deadtime control

Tolerant to negative voltage transient

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(50ns)

No degradation of performance

over time

Shorter time to signal over-

current 1.5s versus 6s)

Reduced EMI and voltage

spikes

APPLICATIONS

Motor Drive

Lighting Ballast

Switched Mode Power Supplies

Automotive

Plasma Display Panels

Up to 50V/ns dV/dt immunity

Optional soft turn-on

Uses low cost bootstrap power supply

CMOS and LSTTL input compatible

IR Gate Driver ICs Simplify Design

Driving a MOSFET or IGBT in the

high side position of a half-bridge

topology or 3 phase inverter leg

offers the additional challenge that

the gate voltage is referenced to

the source rather than to ground.

The source voltage is a floating

point at up to the maximum bus

voltage, or voltage rating of the

MOSFET or IGBT, 600V and up for motor drive, lighting or SMPS applications. IR gate driver uses

a patented level shifter technology for high voltage application and offers the only 1200V rating in

the industry.

These ICs simplify circuit designs by integrating extensive functionality. They use a low costbootstrap supply, while opto-coupler-based circuits typically require an auxiliary power supply. IRGate Driver ICs offer optional single input or dual input programmable deadtime control for lowside and high side drivers as well as for 3 phase drivers to provide design flexibility and allows to

minimize cross-conduction. Unique 3-phase drivers allow driving a 3 phase inverter using a singleIC.

IR Gate Driver ICs enable rugged driver designs

IR Gate Driver ICs are specifically designed with motor drive applications in mind. The newestsoft-turn-on limits voltage and current spike and reduce EMI. In addition, they have up to 50V/nsdV/dt immunity and are tolerant to negative voltage transient. The under-voltage lock-outavailable for most drivers prevents shoot-through currents and device failures during power-up

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and power-down without any additional circuitry. The output drivers feature a high pulse currentbuffer stage designed for minimum driver cross-conduction.

Noise immunity is important for the high-side position which has a floating voltage and issusceptible to high noise levels, particularly in motor drive applications. Noise immunity ensuresthat the MOSFET or IGBT doesn't turn on accidentally. Noise immunity is obtained by using

Schmitt-triggered input with pull-down. Additional noise immunity is obtained with separate logicand ground pins in some ICs, such as the 600V ICs in 14-pin packages.

IR Gate Driver ICs enable fast switching speeds

IR Gate Drive ICs have ten times better delay matching performance than opto-coupler-based

solutions. Delay matching between the low-side and high-side driver is typically within 50ns(and as low as 10ns for some specialty products), allowing complete dead-time control forbetter speed range and torque control in motor drive applications. Fast switching also reducesswitching power losses and allows leveraging the full benefits of the fastest IGBTs available on themarket today for better torque control over a wider speed range.

Application Notes:

AN-978:HV Floating MOS-Gate Driver ICs

AN-985:Six Output 600V MGDs Simplify 3-Phase Motor Drives

Design Notes:

DN500:Short Circuit Protection for Power Inverters

DN501:Accurate Current Sensing in High Voltage Motor Drives

DN502:Short Circuit Protection for Three-Phase Power Inverters

Design Tips:

DT92-2:High Current Buffer for Control ICs

DT04-4:Using Monolithic High Voltage Gate Drivers

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