Product category:
Reference Designs
News Release from: International Rectifier | Subject: IRAUDAMP4
Edited by the Electronicstalk Editorial
Team on 10 July 2007
Audio amplifier design saves space
Reference design cuts PCB board space by 50% for Class D audio amplifiers for the entire mid-voltage range of mid- and high-power amplifiers.
A new Class D audio power amplifier reference design from International Rectifier shows how designers can reduce PCB board space by 50% 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 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% efficiency at 120W, 4ohm
This article was originally published on Electronicstalk on 15 Feb 2001 at 8.00am (UK)
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The design incorporates critical protection features such as overcurrent protection, overvoltage protection, undervoltage protection, DC-protection, and overtemperature protection, in addition to housekeeping functions such as a +/-5V supply for analogue signal processing for the preamplifier and a +12V supply referenced to -B for the Class D gate driver stage.
The two-channel design is scalable for power and a 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 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 four-ohms, eliminating the need for a heatsink to shrink circuit sise, provide greater layout flexibility and reduce overall amplifier system cost.
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