IR2085S Datasheet | International Rectifier

Features - - - - - - - - - - Simple primary side control solution to enable half-bridge DC-Bus Converters for 48V distributed systems with reduced ponent 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 500k Hz max per 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 Product Summary VCC (max) 25V 100Vdc Voffset(max) High/low side output freq (fosc) 500k Hz Output Current (IO) +/-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. Package Each channel frequency is equal to fosc, where fosc can be set by selecting RT & CT, S O -8 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 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) Vcc Vb S1 C2 IR2085 RT CT C BIAS S R1 L S R2 R Vo Vs Cs S2 C1 .irf. IR2085S & (Pb F) Absolute Maximum Ratings Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. All voltage parameters are absolute voltages referenced to . All currents are defined...