Class D has PWM switch
08 February 2008
International Rectifier's chipset has the IRS2092 audio driver IC with protected PWM switching and IR’s audio MOSFETs.
The chipset targets medium power, high performance Class D audio amplifiers from 50W to 500W in home theatre, home stereo, active speaker, musical instrument, and professional audio applications. In a 100W application, the IRS2092 IC and IRF6645 Direct MOSFETs reduce board size by 60 per cent and eliminate 20 per cent of the parts from the typical bill of materials.
Based upon a half bridge topology, the new audio driver IC integrates four essential functions for Class D design implementation, including error amplifier, PWM comparator, gate driver, and robust protection circuitry. As a result, this compact 16-pin IC offers high noise immunity and reduced start and stop click noise, while greatly reducing some of the most complicated and costly design tasks such as overload protection.
Key features of the IRS2092 include an analogue PWM modulator with frequency up to 800kHz, programmable bi-directional over-current protection (OCP) with self-reset control, under-voltage lockout protection (UVLO), and programmable preset deadtime for a scalable power design.
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