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On Semi NCS8353立体声每路20W D类功率放大方案

关键词:消费类电子 D类放大器

时间:2011-04-27 09:48:43       作者:On Semi       来源:NCS8353

On Semi公司的NCS8353是立体声每路输出20W的D类音频功率放大器,具有可编程程的功率限制和可选择的增益: 20 dB, 26 dB, 32 dB, 36 dB。NCS8353的效率高达86%,每路的输出功率限制有10W,12W,15W和20W.工作电压8 V 到26 V,主要用在平板电视机和有源扬声器。本文介绍了NCS8353主要特性,基本方框图和8欧姆扬声器典型应用电路图。

Stereo 20W/Ch Class D Audio Power Amplifier with Programmable Power Limit and Selectable Gain

The NCS8353 is a stereo Class D audio power amplifier capable of delivering a continuous power of up to 20 W/ch into an 8ohm bridge tied load (BTL). It can be powered from the existing 24 V rail in Flat Panel Television (FPTV) systems. The high efficiency of the NCS8353, 86%, reduces the requirement of an external heat sink when driving
high power.

The digital power limit feature can program the output power limit at 10 W, 12 W, 15 W, or 20 W/ch, allowing the NCS8353 to be a single system solution in FPTV audio applications.

The NCS8353 includes a digital power limit feature. The digital power limiter quickly reduces the internal gain of the amplifier when high amplitude signals would cause excessive clipping on the output.
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