Application and design scheme of LM4702 power amplifier module This is the first product in a new series of high-performance audio chips. It has a wide power supply voltage range, and also has a mute function and multiple protection functions. It is suitable for advanced home audio systems and also meets the strict requirements of professional audio equipment. IC LM4702 (Figure 1). LM4702 pdf datasheet
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The LM4702 chip is actually an audio amplifier driver IC suitable for high power supply voltage. It contains two sets of independent audio amplifier and driver parts. As long as a few external components are connected, a high-performance audio amplifier can be formed.
The LM4702 can drive multiple high-power discrete transistors or multiple pairs of Darlington transistors. It is suitable for systems that can provide output power of 25W to more than 300W per channel. Its typical application circuit is shown in Figure 2. 
On the homepage of the country half company, you can download the application design information (http://TIonal.com/an/AN/AN-1490.pdf), the total harmonic distortion and noise of this circuit in the best working state (THD + N) is only 0.0006%. Designers can adjust the output power of the amplifier as long as they change the supply voltage and related output power transistors. For high current and power applications, the output stage can be configured in parallel with multiple tubes without changing the basic circuit of the LM4702 driver.
The LM4702 chip is equipped with an advanced overheat protection circuit. If the chip temperature exceeds 150 ° C, the protection circuit will be activated. In addition, this driver is also equipped with a mute function that can suppress switching / switching noise. When this function is activated, the output of the amplifier can be reduced to the equivalent quiescent current state. This function can easily design a stand-by (standby) status. 
