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IR unrolls Class D audio amp reference design

Posted: 11 Jul 2007 ?? ?Print Version ?Bookmark and Share

Keywords:Class D audio amp? reference design? IR reference design?

IRAUDAMP4

International Rectifier has introduced the IRAUDAMP4 Class D audio power amplifier reference design. Compared to typical circuit designs, the new reference design illustrates how designers can reduce PCB board space by 50 percent for Class D audio amplifiers for the entire mid-voltage range of mid- and high-power amplifiers for home theatre applications, professional amplifiers, musical instruments and car entertainment.

"With THD+N at 0.004 percent at 60W into 4, this reference design demonstrates IR's silicon enabling the best in audio performance from Class D topology," said Stephane Ernoux, product marketing manager at International Rectifier.

Showcasing IR's IRS20955 200V digital audio driver IC and the IRF6645 DirectFET digital audio MOSFETs, the IRAUDAMP4 reference design is a two-channel, 120W half-bridge design offering 96 percent efficiency at 120W, 4. The design incorporates critical protection features such as overcurrent protection, overvoltage protection, undervoltage protection, DC protection, and overtemperature protection. It also features housekeeping functions such as a 5V supply for analog signal processing for the preamplifier and a 12V supply (Vcc) referenced to -B for the Class D gate driver stage. The two-channel design is scalable for power and number of channels and requires no heatsink under normal operating conditions.

The IRS20955(S)(TR)PbF audio driver IC, on which the reference design is based, features a floating PWM input designed specifically for Class D audio amplifier applications. Bidirectional current sensing detects overcurrent conditions during positive and negative load currents without any external shunt resistors. A built-in protection control block provides a secure protection sequence against overcurrent conditions and a programmable reset timer. The internal deadtime generation block enables accurate gate switching and optimum deadtime setting for better audio performance, such as lower THD and lower audio noise floor.

The featured companion IRF6645 power MOSFETs are part of IR's DirectFET family. 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 4, eliminating the need for a heatsink to shrink circuit size, provide greater layout flexibility and reduce overall amplifier system cost.

The IRAUDAMP4 reference design is available immediately for $550 each.




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