IR2085SPBF(2004) Ver la hoja de datos (PDF) - International Rectifier

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IR2085SPBF
(Rev.:2004)

HIGH SPEED, 100V, SELF OSCILLATING 50% DUTY CYCLE, HALF-BRIDGE DRIVER

International Rectifier 

Data Sheet No. PD60206 Rev.C

IR2085S & (PbF)

HIGH SPEED, 100V, SELF OSCILLATING 50% DUTY CYCLE,

Features

HALF-BRIDGE DRIVER

• Simple primary side control solution to enable half-bridge

Product Summary

DC-Bus Converters for 48V distributed systems with reduced

component count and board space.

• Integrated 50% duty cycle oscillator & half-bridge driver IC in a

single SO-8 package

• Programmable switching frequency with up to 500kHz max per

VCC (max)

Voffset(max)

High/low side

25V

100Vdc

channel

• +/- 1A drive current capability optimized for low charge MOSFETs

• Adjustable dead-time 50nsec – 200nsec

• Floating channel designed for bootstrap operation up to +100Vdc

• High and low side pulse width matching to +/- 25nsec

• Adjustable overcurrent protection

• Undervoltage lockout and internal soft start

• Also available LEAD-FREE

Description

output freq (fosc)

500kHz

Output Current (IO)

+/-1.0A(typ.)

High/low side pulse

width matching

+/- 25ns

Package

The IR2085S is a self oscillating half-bridge driver IC with 50% duty cycle ideally

suited for 36V-75V half-bridge DC-bus converters. This product is also suitable for

push-pull converters without restriction on input voltage.

Each channel frequency is equal to fosc, where fosc can be set by selecting RT & CT,

where fosc ≈ 1/(2*RT.CT). Dead-time can be controlled through proper selection of CT

and can range from 50 to 200nsec. Internal soft-start increases the pulse width during

S O -8

power up and maintains pulse width matching for the high and low outputs throughout the start up cycle. The

IR2085S initiates a soft start at power up and after every overcurrent condition. Undervoltage lockout prevents

operation if VCC is less than 7.5Vdc.

Simplified Circuit Diagram

Vbias (10-15V)

D BOOT

C BOOT

Vin ( 100V max)

Vb

S1

C2

Vcc

HO

RT

OSC

Vs

CT

C BIAS

S2

C1

Cs

LO

GND

S R1

L

C R Vo

S R2

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