Reference Design Delivers Compact 120-W Class D Amplifier

July 17, 2006
The International Rectifier IRAUDAMP3 needs no heatsink and covers just 4.5 sq. in.

The IRAUDAMP3 Class D audio reference design offers a complete six-channel 120-W half-bridge audio power amplifier without a heatsink and in a footprint of only 4.5 sq. in. The reference design employs an IRS20124S high-voltage IC, which features an internal selectable dead-time generation circuit and is immune to noise and supply voltage fluctuations to help achieve a total harmonic distortion of 0.01% at 60 W and 4-ohm load impedance, and 94% efficiency at 120 W and 4 ohms, single channel. The IC also has built-in bi-directional current sensing and an integrated shutdown function to protect the output MOSFETs when an over-current condition like a short-circuited speaker wire occurs.

Also used in the reference design is the IRF6645 DirectFET power MOSFET. The patented DirectFET packaging technology enhances performance in Class D audio amplifier circuits by reducing lead inductance, which improves switching performance and reduces electromagnetic interference. The package’s higher thermal efficiency allows 120-W operation into 4 ohms while eliminating the need for a heatsink. The result is greater layout flexibility and lower overall system cost. Devices in the DirectFET package are RoHS compliant.

The IRAUDAMP3 reference design is available immediately. PRICING
The reference design costs $995 each. Prices are subject to change. FOR MORE INFORMATION
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