Title :
Single chip design of closed-loop class D audio power amplifier
Author :
Yong, Xu ; Fei, Zhao ; Yuanliang, Wu ; Rui, Min ; Zheng, Sun ; Lu, Tang
Author_Institution :
Coll. of Sci., PLA Univ. of Sci. & Technol., Nanjing, China
Abstract :
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.
Keywords :
audio-frequency amplifiers; network synthesis; power amplifiers; pulse width modulation; thermal management (packaging); closed-loop class D audio power amplifier; closed-loop pulse width modulation; rail-to-rail operational amplifier; single chip design; thermal protection; Driver circuits; MOS devices; Power amplifiers; Power generation; Pulse width modulation; Rail to rail amplifiers; Rail to rail inputs; Class D Audio Power Amplifier; Integrated Circuit; Pulse Width Modulation; Thermal Shutdown Protection;
Conference_Titel :
Wireless Communications and Signal Processing (WCSP), 2010 International Conference on
Conference_Location :
Suzhou
Print_ISBN :
978-1-4244-7556-8
Electronic_ISBN :
978-1-4244-7554-4
DOI :
10.1109/WCSP.2010.5633477
