Mixed Signal/Analog

Class D chipset for audio amplifier applications

7th April 2014
Nat Bowers

International Rectifier has introduced an audio chipset optimised for high performance Class D audio amplifier applications. The Class D audio chipset is comprised of the IRS20965 digital audio driver IC with protected Pulse Width Modulation (PWM) switching and a full complement of audio MOSFETs.

The IRS20965 features high-side and low-side independent floating PWM input to allow deadtime control from an external PWM controller. Shoot-through prevention logic provides additional safety in the event of PWM controller failure. The IC also features over-current sensing output and 2A gate drive output capability.

Operating up to 800kHz, other key features of the IRS20965 include programmable bidirectional over-current detection with self-reset function, high noise immunity, ±100V ratings to deliver up to 500W in output power and 3.3/5 V logic compatible input. Supplied in a 16-lead SOIC package, the digital audio driver IC features propagation delay of 120ns, OC protection delay of 500s and shutdown delay of 250ns.

“The new chipset featuring the IRS20965 brings the additional flexibility of an external controller which programs performance and protection features. For example, it allows non-shutdown overload protection while maintaining high audio performance,” commented Jun Honda, Director of Audio Systems Engineering, Energy Saving Products Business Unit, International Rectifier.

Pricing for the RoHS compliant and industrial qualified IRS20965 begins at $3.83 (USD) each in 10,000 unit quantities. Production orders are available immediately.

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