5000 integrated circuits power audio amplifiers data book

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5000 integrated circuits power audio amplifiers data book

Postby SPeter » 26 Feb 2011, 21:06

Hope will be useful to many people!

One of the basic components of any sound-reproducing system, without dependence from its class is the power
amplifier of audio frequencies called also the power audio amplifier.
With reference to consumer and professional electronics equipments, the greatest popularity are the integrated
circuits-power audio amplifiers, due to their advantages - schematic simplicity, small dimensionss, large range of
output powers, polyfunctionality.
For correct usage of integrated circuits of the power audio amplifiers, irresepective of a field of application, it is
necessary to know following:
- Function of integrated circuit;
- The main electrical characteristics;
- Schematic of connection and (or) internal structure;
- Package type;
- Equivalents (replacements).
In the literature, the great many of the characteristics which one describe the electrical and operational param-
eters of power audio amplifiers depending on evaluation yardsticks and can give completely different estimations to
quality of operation of a amplifiers. Main of parameters used for the description of power audio amplifiers is following:
a gain; a bandwidt; a dynamic (phase, phase-frequency, peak (amplitude)) characteristic; linear and nonlinear
distortions; efficiency; input characteristics (impedance, current, voltage and power, impedance of a source of an
input sound signal); output characteristics (impedance, current, voltage, output power); a dinamic range; signal-
to-noise ratio and maximum ratings of electrical parameters.
The gain Gv (on a current, a voltage or power, depending on purpose of the amplifier) represents the logarithm
of the ratio of signal output from a amplifier to signal input to the amplifier. The gain Gv can be expressed as a direct
ratio (V/mV or V/µV), and in the logarithmic relation (in decibels -dB). The gain depends on value of external compo-
nents, from resistance of loading Rl, input resistance Rin, a supply voltage Vcc, frequency and temperature.
The frequency bandwidt Bw - area of frequencies (a bandwidt from bottom limit frequency Fl up to top fre-
quency Fh) within the gain changes no more than on ±3 dB, concerning gain measured on frequency 1 KHz. In the
certain cases when the manufacturer wants to emphasize the expanded range of working frequencies of the amplifier
at the improved non-uniformity frequency characteristics, the size of non-uniformity (1 dB, 0,5 dB etc.) is indicated
also.5000 integrated circuits power audio amplifiers data book


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