Single chip design of closed-loop class D audio power amplifier
Wireless Communications and Signal Processing(2010)
摘要
A single chip design of class D audio power amplifier is presented. It is composed with a rail-to-rail operational amplifier and a closed-loop pulse width modulation. It achieves a maxim power of 3.75W and consumes about 1.9mA quiescent current as maxim efficiency is more than 90%. When sine wave input signal frequency is 1KHz and output power is 3.75W, the THD of output signal is only 0.1%. The chip is designed with thermal protection which turns the device off when the junction temperature surpasses 150°C to prevent damage to the IC. ©2010 IEEE.
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关键词
class d audio power amplifier,integrated circuit,pulse width modulation,thermal shutdown protection,network synthesis,power generation,operational amplifier,chip,power amplifier
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