AUIR2085STR

The AUIR2085S is a self oscillating half-bridge driver IC with 50% duty cycle ideally suited for 36V – 75V half-bridge DC-bus converters. Each channel frequency is equal to fOSC, which can be set by selecting 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. Typically soft-start duty cycle varies beginning from 5 - 10% ramping up to about 50% over 1000 cycles. The AUIR2085S initiates a soft start at power up and after every overcurrent condition. Undervoltage lockout prevents operation if VCC is less than 7.5V.

Applications

• DC-DC Converters
• HEV Auxiliary Converter
• Battery Management Converters

Key features

• Simple primary side control solution to enable halfbridge 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
• Leadfree, RoHS compliant
• Automotive qualified