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Consumer Electronics by S. P. Bali

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THE CA810 INTEGRATED CIRCUIT

BEL CA810 is a monolithic audio power amplifier intended for use in stereo amplifies, tv receivers, radio receivers and other audio applications. The salient features of this device are :

  • Large output current—7 W directly into 4 Ω load
  • Low harmonic and crossover distortion.
  • Operation over wide supply voltage range—4 V to 20 V, 2.5 A peak output current.
  • Integral thermal limiting circuit, that shuts down the device in case of excessive package temperature.
  • Minimal external components.

The functional diagram of CA810 is shown in Fig. 20.9(a). It contains a buffer, a preamplifier, a driver, a class 'B' output stage and a thermal limiting circuit. Emitter follower transistor Q1 forms the buffer stage and provides an ...

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