IR51H420 Ver la hoja de datos (PDF) - International Rectifier

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Fabricante

IR51H420

SELF-OSCILLATING HALF BRIDGE

International Rectifier 

Preliminary Data Sheet No. PD60083I

IR51H(D)224

IR51H(D)320

IR51H(D)420

SELF-OSCILLATING HALF BRIDGE

Features

• Output Power MOSFETs in half-bridge configuration

• High side gate drive designed for bootstrap operation

• Bootstrap diode integrated into package (HD type)

• Accurate timing control for both Power MOSFETs

Matched delay to get 50% duty cycle

Matched deadtime of 1.2us

• Internal oscillator with programmable frequency

f=

1

1. 4 × (RT + 75Ω) × CT

Product Summary

VIN (max) 250V (IR51H(D)224)

400V (IR51H(D)310)

500V (IR51H(D)420)

Duty Cycle

50%

Deadtime

1.2µs

Rds(on)

1.1W (IR51H(D)224)

3.0W (IR51H(D)310)

3.6W (IR51H(D)420)

• 15.6V Zener clamped Vcc for offline operation

• Half-bridge output is out of phase with RT

• Micropower startup

PD (TA = 25oC)

Package

2.0W

Description

The IR51H(D)XXX are complete high voltage, high speed, self-

oscillating half-bridge circuits. Proprietary HVIC and latch im-

mune CMOS technologies, along with the HEXFET® power

MOSFET technology, enable ruggedized single package construc-

tion.The front-end features a programmable oscillator which func-

tions similar to the CMOS 555 timer. The supply to the control

circuit has a zener clamp to simplify offline operation. The output

features two HEXFETs in a half-bridge configuration with an in-

ternally set deadtime designed for minimum cross-conduction in

the half-bridge. Propagation delays for the high and low side

power MOSFETs are matched to simplify

use in 50% duty cycle applications. The

device can operate up to 500 volts.

Typical Connection

DC Bus

VIN

COM

D1

IR51H(D)XXX

1 Vcc

VB

6

2

RT

9

VIN

RT

3 CT

VO 7

CT

4 COM

External

Fast recovery diode D1 is

not required for HD type

TO,

LOAD

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