内置的耳机功放或许只是一片还不错的功放芯片。
The embedded headphone "amp" is probably just a good-enough chip amp.
第二章详细分析了芯片的内部线路图，重新设计音频功放LS7294；
The second chapter covers the analysis of the internal circuit of the chip, and the redesign of audio amplifier called LS7294;
该功放采用集成PWM波产生芯片SG3524作为PWM波产生芯片，采用EXB841作为过流保护芯片。
The integrated chip SG3524 is used to generate PWM wave, and the circuit-protection chip EXB841 is used in the design of the power amplifier.
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