Class D audio amplifier delivers constant 1-W to provide continuous high quality audio output as battery depletes

ON Semiconductor has introduced a new Class D audio amplifier with an integrated charge pump that provides a cost-effective and space-efficient speaker amplifier solution for applications such as cell phones, digital video recorders and portable speakers.

The NCP2830 is a 1 W constant power filterless device that delivers continuous, high quality audio output to an 8.0 ohm Bridge Tied Load (BTL) with less than 1 percent total harmonic distortion – even if the input voltage varies. The device offers longer equipment operating times as the user does not experience reduced audio volume or distortion as the battery depletes.

Housed in a 20-pin QFN package measuring just 3 mm x 3 mm x 0.5 mm, the NCP2830 occupies minimal board space and can also be used where component height is restricted. The integrated design reduces the need for external components and also helps simplify and speed the implementation of a reliable, complete audio amplifier solution.

The NCP2830 operates from a supply voltage of between 2.7 V and 5.5 V, has a fast start-up time of 200 micro seconds (uS) and a power supply ripple rejection ratio (PSRR) of -88 decibels (dB). Overall efficiency is up to 89 percent, and low noise performance is underlined by a signal-to-noise ratio (SNR) of 100 dB. An optimized Pulse Width Modulation (PWM) output stage gives the NCP2830 filterless capability that further reduces the number of external components required.

“One challenge the designers are facing is to deliver powerful, yet clear audio output,” said Marie Capron, low voltage power management business unit director with ON Semiconductor. “The NCP2830 achieves the constant high power audio output with the smallest solution size and cost, thanks to the switched capacitor structure that makes the device unique in the market.”

The NCP2830 uses a halogen-free molding compound and is a RoHS compliant, Pb-Free device.



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