UMZCH car amplifier on a TDA1554Q chip. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automotive power amplifiers
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The amplifier is made on two TDA1554Q ICs, designed to operate in cascades connected in a bridge circuit, and has the following technical characteristics (according to the microcircuit manufacturer and measurement results): sensitivity - 0,5 V, input impedance - 600 Ohm, nominal load resistance - 4 Ohm, rated (maximum) output power 4x15 (4x22) W) with a non-linear distortion factor of 0,25 and 10%, respectively, the reproducible frequency band is 30 ... 16000 and 15 ... 25000 Hz with an uneven frequency response, respectively -1 and -3 dB., supply voltage - 14,4 V, maximum current consumption - 14 A, quiescent current - 0,3 A, current consumption in standby mode - 0,001 A, readiness for operation when turned on - 5 s.
Rice. 6 (click to enlarge)
The scheme of the left channel of the amplifier is shown in fig. 6. The right channel is completely identical to it. Elements C1-C5 and R1-R5 form crossover filters. The amplifier is turned on when a control voltage of 12 V is supplied from the radio. When disconnected from the radio, the amplifier goes into standby mode. The main supply voltage is not switched, since the current consumed by the amplifier in standby mode is less than the self-discharge current of the car battery. R6C9 circuit provides turn-on delay. LC filters are used to filter interference in the power circuits of microcircuits. The high-capacity C10 capacitor in the power filter prevents voltage drop at power peaks and is installed directly in the amplifier case. The input signal is supplied via a shielded cable with a BNC bayonet connector.
The power amplifier is assembled on a printed circuit board, the filters are surface-mounted. Microcircuits and the board are placed on a duralumin corner - a heat sink. Cooling of the amplifier microcircuits is forced by means of a fan from the computer's power supply. The amplifier is installed in the front of the cabin on a shelf under the glove box.
If the amplifier will be connected directly instead of the dynamic heads of the radio, its signal level should be adjusted very carefully, starting from zero, so as not to overload the inputs of the microcircuit.
In the event that the device with which the amplifier is supposed to be used has an output stage made according to the bridge circuit, oxide capacitors with a capacity of 10 uF must be connected between its output and the filter board, and their positive terminals must be connected to the input jacks.
When mounting the amplifier, fixed resistors MLT-0,25 and variables .SP3-12a can be used. Amplifier oxide capacitors K50-18 (C10) and K50-24 (C7-C9), the rest - any ceramic. The power filter coil L1 is wound on an annular magnetic circuit with dimensions of 20x10x8 mm made of 2000NN ferrite and contains 5 turns of a mounting wire with an inner core cross section (Uez insulation) of 1 ... 1,5 mm2.
The speaker coil L1 is wound on a 2000NN ferrite rod with a diameter of 8 and a length of 20 mm and contains 15 turns of PEV-1 1,0 wire. Capacitors C1-C2 - KBG-MN, C3.C4 - K50-24, PEV resistors - 5 watts.
Literature
- Elyutin A. Gender issues -, "Master 12 volts" No. 1997/1998 p.20-23
- Elyutin A. Do you need a strong rear -, "Salon AV" No. 3/1998 p.84-87
- Shikhatov A. Passive tone controls - Radio, 1999, No. 1 pp. 14-15.
- Ageev S. Should the UMZCH have a low output impedance? - "Radio" No. 4/1997 pp. 14-16.
Author: A. Shikhatov; Publication: bluesmobile.com/shikhman
See other articles Section Automotive power amplifiers.
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