EL SEGUNDO, Calif. — September 2005 — International Rectifier, IR® (NYSE: IRF), a world leader in power management technology, today introduced the IRS20124S, a 200V control IC developed specifically for Class D audio applications up to 500W per channel. Integrated features such as adjustable dead-time generation and bi-directional over-current sensing protect the amplifier system. Also, these features allow audio designers to simplify circuits and minimize component count for Class D audio amplifiers in home theatre entertainment systems, audio-video receivers and automotive sound systems.

The internal, selectable dead-time generation circuit is thermally compensated for stability, and is immune to noise and supply voltage fluctuations to help improve total harmonic distortion, or THD. The IRS20124S has built-in bi-directional current sensing and combines with an integrated shutdown function to protect the output MOSFETs when an over-current condition occurs, such as a short-circuited speaker wire.

“Circuit designers can reduce system footprints, improve PCB layouts, reduce EMI and improve thermal characteristics using IR’s new Class D audio IC to drive audio MOSFETs, such as the IRF6665,” said David Tam, Vice President, Consumer and Industrial Sector Business.

“Since Class D audio circuits need to deal with switching high voltage at high frequency, IR’s expertise in optimizing MOSFETs and high voltage control ICs for switching applications is a perfect match to digital audio systems. IR’s application-specific devices enable higher efficiency, increased power density and better audio performance,” Tam concluded.

Part Number	Package	Voffset	Vout	Io+/-	Prop Delay Selectable	Dead Time
IRS20124S	14-pin SOIC	200V max	10-20V	1A / 1.2A typ.	70ns typ.	15/25/35/45ns typ.

Design Assistance

Links to device data sheets, product selection guides and Class D Audio Application Notes can be found on the International Rectifier Audio Web page, at http://www.irf.com/product-info/audio/

Availability and Pricing

The new IRS20124S Class D audio high voltage control IC is available immediately. The device is lead-free and RoHS-compliant. Pricing is US $1.50 each for the IRS20124S in the 14-pin SOIC in 10,000-unit quantities. Prices are subject to change.