International Rectifier Introduces High Voltage Class D Audio Control IC That Protects and Simplifies Digital Amplifier Circuits
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International Rectifier Introduces High Voltage Class D Audio Control IC That Protects and Simplifies Digital Amplifier Circuits

EL SEGUNDO, Calif.—(BUSINESS WIRE)—Sept. 15, 2005— International Rectifier, IR(r) (NYSE: IRF), a world leader in power management technology, today introduced the IRS20124SPbF, 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 IRS20124SPbF 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.

Design Assistance

A data sheet for the IRS20124SPbF is posted on the International Rectifier Web site:

In addition, product selection guides and Class D Audio Application Notes can be found on the International Rectifier Audio Web page:

Availability and Pricing

The new IRS20124SPbF 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 IRS20124SPbF in the 14-pin SOIC in 10,000-unit quantities. Prices are subject to change.

About International Rectifier

International Rectifier (NYSE: IRF) is a world leader in power management technology. IR's analog and mixed signal ICs, advanced circuit devices, integrated power systems and components enable high performance computing and reduce energy waste from motors, the world's single largest consumer of electricity. Leading manufacturers of computers, energy efficient appliances, lighting, automobiles, satellites, aircraft and defense systems rely on IR's power management benchmarks to power their next generation products. For more information, go to

Trademark Notice

IR(r) is a registered trademark of International Rectifier Corporation.

International Rectifier
Wayne Yoshida, 310-252-7726 

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