IR2085STR View Datasheet(PDF) - International Rectifier

Part Name

Description

Manufacturer

IR2085STR

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

International Rectifier 

Data Sheet No. PD60206 Rev.D

IR2085S & (PbF)

HIGH SPEED, 100V, SELF OSCILLATING 50%

DUTY CYCLE, HALF-BRIDGE DRIVER

Features

• Simple primary side control solution to enable half-bridge 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 channel

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

MOSFETs

• Adjustable dead-time 50ns – 200ns

• Floating channel designed for bootstrap operation up to

+100Vdc

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

• Adjustable overcurrent protection

• Undervoltage lockout and internal soft start

• Also available Leadfree

Product Summary

Topology

Half-Bridge

VOFFSET

≤ 100 V

Io+ & I o- (typical)

1.0A & 1.0A

fOSC (max)

500kHz

Deadtime

50ns – 200ns

HO/LO Pulse

Matching

+/- 25ns

Package

8 - Lead SOIC

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 fOSC, which 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 50ns to 200ns. 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 VCC is less than 7.5V.

Typical Connection Diagram

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