Power amplifier on TDA1562 (P=55 Watts). Scheme, description

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Power amplifier on a TDA1562 chip (55 watts). Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers

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The amplifier is built on a microcircuit of the bourgeois company Philips TDA1562, in which the so-called H mode is implemented. Its essence is that up to a certain output power value (approximately 20 watts), the amplifier operates in mode B. If the output power grows further, a smart boost circuit is turned on. voltage at the output stage and thus allows you to swing the amplifier up to a maximum power of 70 watts.

Well, at least that's how it looks in theory.

The main characteristics are as follows:

Supply voltage	14,4
Current consumption in silent mode, mA	110
Input resistance, kOhm	150
Rated output power (KG=0,5%), W	55
Maximum output power (KG=10%), W	70
Reproducible frequency range, Hz	20 20000 ...

Inclusion circuit

Generally speaking, this IC is recommended for use in an entry-level subwoofer in a car. And the above scheme is optimized for just such an application. Although, of course, no one bothers to reproduce the full signal with its help.

Capacitors C4 and C5 work as power storage devices for the functioning of the very smart circuit that ensures the operation of mode H. The HL1 LED - diagnostic - turns on in case of emergency conditions of the microcircuit - overheating, short circuit in the load and very large signal distortions. It is recommended to supply power to the amplifier directly from the car battery, and with as thick wires as possible.

About details

Designation in the diagram	Nominal
R1, R2, R3	10kOhm
R4	1kOhm
C1, C2	0,22uF
C3	10uFx16V
C4, C5	10000uFx25V
C6	0,1uF
C7	4700uFx25V
VT1	KT3107
HL1	any
DA1	TDA1562

Capacitors C1 and C2 must be film, for example K73-17 or any other, but in no case ceramic. Electrolytic capacitors can also be taken with an operating voltage of 16 volts, but the reliability of such a solution will be lower. Transistor VT1 can be replaced by KT361 with any letter.

You can take the printed circuit board here.

Publication: radiokot.ru

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