2-channel 120 W class D audio amp reference design
5 September 2007
Analogue, Mixed Signal, LSI
Showcasing International Rectifier's IRS20955 200V digital audio driver IC and the IRF6645 DirectFET digital audio MOSFETs, the new IRAUDAMP4 reference design is a two-channel, 120 W half-bridge design offering 96% efficiency at 120 W and 4 Ω. The design incorporates critical protection features such as over-current protection, over-voltage protection, under-voltage protection, DC-protection, and over-temperature protection, in addition to housekeeping functions such as a ±5 V supply for analog signal processing for the preamplifier and a +12 V 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 over-current conditions during positive and negative load currents without any external shunt resistors. A built-in protection control block provides a secure protection sequence against over-current conditions and a programmable reset timer. The internal dead-time generation block enables accurate gate switching and optimum dead-time setting for better audio performance, such as lower total harmonic distortion and lower audio noise floor.
The featured companion IRF6645 power MOSFETs are part of International Rectifier'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 120 W operation into 4 Ω, eliminating the need for a heatsink, thereby shrinking circuit size, providing greater layout flexibility and reducing overall amplifier system cost.
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