UMZCH high power (for disco). Scheme, description

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UMZCH high power (for disco). 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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UMZCH increased power (for disco) is made on a hybrid IC Sanyo STK4231-II. The microcircuit is two-channel, therefore, only one IC package is required to form a bridged load connection BA1. The sound signal to the upper amplifier according to the circuit (pin 3 DA2) comes directly, and to the lower one (pin 20 DA2) - through a single inverter on the op-amp DA1. Output current sensors R18 and R28 in case of overload or short circuit. loads open transistors VT2, VT1, and behind them the analog of the thyristor on VT3, VT4 is “latched”, closing resistors R25, R31 to ground and turning off the amplifier.

L1 and L2 are wound with a millimeter wire in one layer on resistors R17, R29 (C5-16 with a power of 5 W). Due to the large power dissipation, the DA2 IC must be mounted directly on an efficient heat sink (preferably with forced airflow - a fan from the PC processor), preventing it from heating above 70 ° C.

Features

Rated input voltage of the amplifier: 500 mV;
Maximum output power 320 W into a load of 5,3 ohms;
Rated output power 200W;
Kg < 0,4%

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Literature

"Radio" No. 11/2005, pp. 16-18

Publication: cxem.net

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