Integrated switchers cut component count

24 October 2001 Power Electronics / Power Management

International Rectifier's IRIS Series integrated switchers combine a HEXFET power MOSFET with a controller IC in a single package. The switchers simplify design and reduce PCB area and component count by 25% at the same or better efficiency than discrete-based circuits in AC-DC switched mode power supply (SMPS) say the manufacturers. The devices are optimised for flyback topologies in universal and single-input, 60 to 180 W SMPS. They are designed to simplify design, decrease cost, and reduce size and weight in high-volume consumer applications. The benefit of the combination MOSFET/controller IC is reduced stray circuit inductance due to PCB and the discrete package, resulting in lower switching losses at higher PWM frequencies. IR claims efficiency is improved by up to 1,5% compared to a discrete solution with equivalent MOSFET ratings and up to 4,5% compared to competitive devices with equivalent ratings.

Avnet Kopp

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