Audio output amplifier with parallel class AB stages

Details Audio output amplifier with parallel class AB stages Audio output amplifier with parallel class AB stages

1997-10-06

1999-01-05

Pascal, Robert

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

330146, 381 28, H03F 368

Patent

active

058567593

ABSTRACT:
A high output power is obtained for an audio power amplifier using an amplifier circuit topology wherein channels or stages of a multi-channel class AB monolithic integrated circuit are paralleled in order to drive a low impedance dual voice coil speaker. The stages are paralleled by connecting their outputs through isolation resistors. These resistors prevent the differences in output bias voltages from resulting in a short circuit from power to ground. In addition, the resistors are sufficiently small to achieve the correct speaker damping factor, yet large enough to prevent excessive quiescent current. The separate amplifier channels or stages are paralleled through isolation resistors which increases current drive resulting in a higher output power to the loud speaker.

REFERENCES:
patent: 4376267 (1983-03-01), Chu et al.
patent: 5162753 (1992-11-01), Khorramabadi
patent: 5386474 (1995-01-01), Grodinsky et al.
patent: 5465074 (1995-11-01), Maschmann et al.
patent: 5729174 (1998-03-01), Dunnebacke et al.
Bridge/Parallel Amplifier (BPA-200) Documentation, National Semiconductor, Sep. 19, 1997.
SGS-Thomson Microelectronics, TDA7454, Apr., 1995, Data Sheet.
SGS-Thomson Microelectronics, TDA7374B, Apr., 1995, Data Sheet.
Phillips, TDA8566Q, Apr., 1996, Data Sheet.

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