Bridge circuit on the TDA2005 chip 2. Scheme, description

Bridge circuit on a TDA2005 chip. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers

The TDA2005 stereo audio amplifier chip can be used in a bridge circuit as a mono amplifier with double the output power. Both halves of the DC amplifier have the same circuitry. In this circuit, the output signal of the "lower" part through the divider (R4, R5) and R3 "drives" the upper part.

Bridge circuit on TDA2005

Since R3=R5 and R2=2R4, the gain of the circuit is Ku=4R4/R5. Since the minimum load impedance of each half of the amplifier is 2 ohms, the diagonal of the bridge (between the output points) can include at least a 4 ohm speaker. Therefore, with a supply voltage (U1) for example 16V, the maximum output power will be 18-20 watts. As can be seen, large output capacitors are no longer necessary: well-matched, identical voltages are present at both output points, and hence the potential difference between the loudspeaker terminals at rest is minimal.

Literature

Hobby Electronics, No. 7,1996, XNUMX.

Translation by A. Volsky; Publication: N. Bolshakov, rf.atnn.ru

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