Two-channel stabilizer on the TDA2004 chip. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Two-channel stabilizer on the TDA2004 chip. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Surge Protectors

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If for some reason you are not satisfied with the sound quality of the UMZCH on a specific instance of the TDA2004 or TDA2004A IC, then such a microcircuit can be used as a two-channel compensation type voltage stabilizer. Moreover, partially faulty specimens can be used as a voltage stabilizer, for example, if one of the channels does not work or even both amplifiers of the microcircuit are partially faulty. To work as a stabilizer, faulty specimens with a break in the "lower" output transistor of the IC are suitable. With such a malfunction, the microcircuit operating as part of the UMZCH makes a wheezing sound when operating on a low-resistance load. Instances of microcircuits prone to self-excitation are also suitable. The quiescent current of a partially faulty microcircuit should not exceed 80 mA.

Schematic diagram of a two-channel stabilizer made on a TDA2004 chip. shown in fig. 1. The stabilizer is configured for output voltages of +9 and +5 V. The maximum load current for each channel should not exceed 2 A, and the maximum power dissipated by the microcircuit should not exceed 30 W.

Two-channel stabilizer on a TDA2004 chip

The input supply voltage is supplied to the pin. S DA1 through a polymer resettable fuse FU1. Capacitors C1, C8 are blocking capacitors in the IC power supply circuit. The output voltage of the stabilizer depends on the stabilization voltage of the applied instance of the zener diode, which will be equal to the operating voltage of the zener diode of 0,7 ... direct current. The second stabilizer has a 0,8V zener diode, which allows you to get a voltage of <-8,2V at the output.

The minimum difference between the input and output voltage, at which the stabilizer retains stabilizing properties, is 2 V at a load current of 2 A or 1 V at a load current of 0,1 A. The intrinsic current consumption of DA1 is 70 mA at a supply voltage of 18 V or 40 mA at supply voltage of 10 V. Such parameters limit the scope of stabilizers on TDA2O04, but they are quite suitable for use, for example, in automotive electronics devices, for powering microcomputers, game consoles, as part of chargers. Stabilizers can be turned off by applying a control voltage to the control input. In this case, the corresponding transistor will open, the voltage at the output of the corresponding stabilizer will become zero. If turning off one or both stabilizers is not required, then the elements R1, R3, VT1 and, or R2, R4, VT2 can be omitted.

Capacitors C4, C5 prevent self-excitation of the microcircuit. Capacitors C6, C10 and C7, C11 are blocking capacitors for output voltages.

The device can be mounted on a 77x45 mm printed circuit board. rice. 2. Fixed resistors such as MLT, S1-14, S2-23 and other general applications. Oxide capacitors - K50-35, K50-88, K50-29 or analogues. Non-polar capacitors ceramic type K10-17, K10-50, KM-5. The 1N4738A zener diode can be replaced with the BZV55C-8V2. TZMC-8V2, KS182C, 2S182K1, KS182A. Instead of Zener diode 1 N4731A, BZV55C-4V3, TZMC-4V3, 2S143D1 are suitable. For the output voltage of the stabilizer +12 V, a KS211Ts zener diode with a Schottky diode connected in series is suitable. If you install an AL307KM LED instead of a zener diode, then the output voltage will be about 2,4 V. Instead of the TDA2004 IC, the TDA2004A is suitable. You can also try TDA2005S, A2000V, A2006V, DBL1032-D, LM2005, μPC2005 microcircuits.

All these microcircuits have a maximum supply voltage of +18 V, the minimum supply voltage for the A2000V, A2005V microcircuits is 4 V, for the rest it is 8 V. With at the maximum allowable load of the stabilizer. Resettable fuse MF-R60 can be replaced by LP400-30 Instead of KT400G transistors, any of the KT3102, KT312 KT315, KT3102 series will do. SSS645.

When used in the design of a fully functional microcircuit instance, one of its channels can be used to amplify audio frequency signals, and the other as a stabilizer. In this version, the design can be used to upgrade obsolete radio equipment, the operation of which from autonomous power sources is not expected, for example, the massive Okean and Meridian radio receivers popular in the 70-80s of the last century. When manufacturing a power supply based on the TDA2004 IC, any transformer of suitable power with an open-circuit voltage on the secondary winding up to 16 V is suitable as a power step-down transformer. For example, KBU6M with a small body tap is suitable as a bridge diode rectifier.

Author: Butov A.L.

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