Integrated OTL power amplifier circuit composed by the TDA2040

Posted on Mar 28, 2007

By an integrated power amplifier TDA2040 composed OTL power amplifier circuit is shown, which uses +3V single supply as the working voltage. This circuit voltage gain 30 dB (32

Integrated OTL power amplifier circuit composed by the TDA2040
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times magnification), the speaker impedance Z chaos 4 Q, output power I5W, speaker barrier anti ZBL: 80, the output power is 7.5W. In this circuit, the voltage signal by the integrated power amplifier IC-inverting input terminal of the input coupling capacitor .cl .RJ, bias resistor R2 to the inverting input terminal of the integrated circuit in the power supply voltage of i bias/2 (+16 V) .R3 role is to prevent the bias resistor R, Rz reduced input impedance .Rs feedback resistor, it C4, R4 together form the exchange of negative feedback network, the decision circuit a voltage amplification gain of the circuit RS/R4.C7 the coupling capacitor .R6, C6 form the output terminal network vibration absorption, prevent self-excited circuit .C, the power supply filter capacitor C5.

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