Control IC for automotive drive applications

These include DC/DC converters, HEV auxiliary converters and battery-management converters.

A self-oscillating half-bridge 100V driver IC with 50 per cent duty cycle, the AUIR2085S features an integrated soft-start capacitor that gradually increases duty cycle from zero to 50 per cent for 5msec.

This limits in-rush current during start-up, and maintains equal pulse widths for the high- and low-side Mosfets throughout the start-up sequence.

The low- and high-side pulses for the half-bridge are matched to within +/-25nsec to prevent transformer imbalances during operation.

Other features include +/-1A gate drive current optimised for low-charge Mosfets and adjustable deadtime from 50nsec to 200nsec to protect against shoot-through current.

The AUIR2085S with its smart protection features and small footprint is specifically designed for harsh automotive drive applications including efficient DC/DC converters and fast-switching robust power management solutions.

The AUIR2085S, which is offered in an eight-pin SOIC package and qualified to AEC-Q100 standards, provides programmable switching frequency up to 500kHz for design flexibility.

Higher switching frequency decreases output voltage ripple and allows use of smaller, lower loss magnetic components.

Switching frequency and deadtime can be controlled independently with two external components to customise circuits for a particular application.

The device also features a floating channel designed for bootstrap operation up to +100VDC and VCC supply, under-voltage lockout and adjustable over-current protection.