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一、电路分析 TA7215P典型应用BTL电路原理见图1、图2,其中图2为立体声放大器。在图2中,第⑥脚、(14)脚和(20)脚接地,第一通道第②脚是同相输入端。第③脚是反相输入端,第④、⑤脚间接补偿电容,第(19)脚与第①脚接滤波电容;第⑩脚接电源,第⑧脚供接自举电容之用,第⑨脚是输出端。信号从第②脚输入经放大后从第⑨脚输出至扬声器,另一通道的工作过程完全相同。在图1中,输入信号经隔直电容送到第一通道正相输入端第②脚,经放大后从第⑨脚输出同相信号至扬声器。与此同时,部分放大后的信号经18kΩ和
First, the circuit analysis Typical application of TA7215P BTL circuit shown in Figure 1, Figure 2, in which Figure 2 is a stereo amplifier. In Figure 2, the first ⑥ foot, (14) feet and (20) feet grounded, the first channel ② feet are non-inverting input. The third pin is the inverting input, ④, ⑤ pin indirect compensation capacitor, the first (19) pin and the first pin filter capacitor; the first ⑩ pin connected to the power, the first ⑧ pin for bootstrap capacitors used, the first ⑨ Foot is the output. The signal from the ② feet input amplified by the first ⑨ feet output to the speaker, the other channel’s work exactly the same process. In Figure 1, the input signal through the DC blocking capacitor to the positive input of the first channel of the second pin, amplified by the first ⑨ pin output in-phase signal to the speaker. At the same time, part of the amplified signal by 18kΩ and