EL SEGUNDO, Calif. — June 2006 — International Rectifier, IR® (NYSE: IRF), a world leader in power management technology, today introduced the IRAUDAMP3 Class D audio reference design. The new, compact reference design features the IRS20124S high-voltage analog IC and IRF6645 DirectFET® power MOSFETs to complete a six-channel 120W half-bridge Class D audio power amplifier with no heatsink.

“By optimizing our Class D audio high-voltage ICs with benchmark power MOSFETS, the IRAUDAMP3 delivers outstanding performance benefits and size advantage to our customers,” said David Tam, vice president of International Rectifier’s Energy-Saving Products Segment.

The IRS20124S high-voltage IC incorporated in this reference design features an internal selectable dead-time generation circuit and is immune to noise and supply voltage fluctuations to help achieve a total harmonic distortion (THD) of 0.01% at 60W, 4Ω and 94% efficiency at 120W, 4Ω single channel. Additionally, the IC has built-in bi-directional current sensing and an integrated shutdown function to protect the output MOSFETs when an over-current condition occurs such as a short-circuited speaker wire.

The IRAUDAMP3, which has a footprint of 4.5 square inches for each two channel control and switch function, also utilizes IRF6645 DirectFET power MOSFETs. The innovative DirectFET packaging technology enhances performance in Class D audio amplifier circuits by reducing lead inductance to improve switching performance and reduce EMI noise. The higher thermal efficiency enables 120W operation into 4O, eliminating the need for a heatsink to shrink circuit size, provide greater layout flexibility and reduce overall amplifier system cost.

Part Number	Supply Voltage	Load Impedance	Frequency	Gain Setting
IRAUDAMP3	±35V	4O	400kHz	26dB

Patented DirectFET Packaging Technology

International Rectifier's patented DirectFET MOSFET packages present a whole new set of design advantages not previously delivered by standard plastic discrete packages. Their metal can construction enables dual-side cooling that effectively doubles the current handling capacity of high-frequency DC-DC buck converters powering advanced microprocessors. In addition, devices in the DirectFET package are compliant with the Restriction of Hazardous Substances Directive (RoHS).

Availability and Pricing

The IRAUDAMP3 reference design is available immediately; pricing is US $995 each. Pricing is subject to change.