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

HALF-BRIDGE DRIVER

Package

IR2085S &(PbF)

Data Sheet No. PD60206 Rev.C

Simplified Circuit Diagram

Product Summary

www.irf.com

1

GND

LO

HO

Cs

OSC

R

D

C

S

R1

S

R2

R

C

L

Vbias (10-15V)

S

S

1

2

Vin ( 100V max)

T

C

BIAS

BOOT

BOOT

GND

LO

HO

Cs

OSC

R

D

C

S

R1

S

R2

R

C

L

Vbias (10-15V)

S

S

1

2

Vin ( 100V max)

T

C

BIAS

BOOT

BOOT

Features

DC-Bus Converters for 48V distributed systems with reduced

component count and board space.

single SO-8 package

channel

V

CC (max)

25V

V

offset(max)

100Vdc

High/low side

output freq (f

500kHz

Output Current (I

+/-1.0A(typ.)

High/low side pulse

width matching

+/- 25ns

Description

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 f

where f

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

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 V

SO -8

SO -8