Voltage stabilizer on the LX8384-00CP chip, 3-10 / 1,25-7 volts 5 amps. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Surge Protectors

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This low-voltage voltage regulator is based on LinFinity Microelectronics' LX8384-00CP IC, which is a high-current positive-polarity linear voltage regulator with adjustable output voltage and low saturation voltage. Voltage stabilizers built using this microcircuit are primarily designed to power digital devices, microprocessor-based devices, but can also be used for other purposes.

The maximum load current for the LX8384 series can reach 5A, and the maximum power dissipation (with heat sink) is about 15W.

The stabilizer circuit is shown in Fig.1.

(click to enlarge)

The voltage is supplied to the input of the integrated circuit through a resettable fuse FU1. Diode VD1 protects the stabilizer from supplying voltage in the wrong polarity. When the supply voltage is reversed, the self-healing fuse goes into a high resistance state, the reverse voltage at the DA1 input is limited to a safe value equal to the forward voltage drop across the VD1 diode. Capacitors C1 ... C13 - power filter DA1.

The large total capacitance of these capacitors is necessary to achieve the high performance that the LX8384 is capable of delivering. If the stabilizer is connected to the output of a bridge rectifier, then it is desirable to increase the total capacitance of the capacitors to 10000 microfarads.

The output voltage of the stabilizer is regulated using a variable resistor R3. The adjustment range is from 1,25 to 7 V. By selecting the resistor R1, the upper limit for adjusting the output voltage (7 V) is set. Capacitors C14 ... C20 - blocking in the output voltage circuit.

The HL1 LED indicates the presence of an output supply voltage of more than 2 V. The VD2 diode protects the integral stabilizer from damage by reverse voltage, for example, when, in the event of a short circuit in the primary circuit, the voltage at the input of the stabilizer becomes less than the output. Variable resistor R3 - SPZ-96-1.

To fine-tune the output voltage, a variable resistor with a resistance of 47 ... 100 Ohms can be connected in series with this resistor. The wires going to the variable resistor should be as short as possible. Oxide capacitors in the circuit used conventional, aluminum. The use of several capacitors is caused by the need to reduce the size and cost of the structure.

If desired, in place of C7 ... C12, you can install one capacitor with a capacity of 6800 microfarads, and in place of C15.C17 - a capacitor of 3300 microfarads. All non-polar capacitors are ceramic, for surface mounting, with a capacity of 0,47 ... 4,7 microfarads. Capacitors C1.C6, C18 ... C20 are soldered on the reverse side of the board to the terminals of oxide capacitors. Capacitors C13, C14 are soldered with a low-power soldering iron directly to the terminals of the microcircuit near the case. The "negative" terminals of these two capacitors are connected to a common wire by separate wires.

Diodes KD226A can be replaced by any of the series KD226, KD202, KD411, 1N5401, 1N5407.

The super-bright green L-1503SGT LED can be replaced with any similar one. The self-resetting fuse can be replaced with an LP30-400 or equivalent 4A fuse. This fuse is selected for a lower current rating than the LX8383 integrated regulator is capable of delivering to the load. This was done both to increase the reliability of the device in different operating modes, and for the reason that at a current of 5 A, the fuse does not work immediately, but after several tens of seconds, which allows the stabilizer to be operated for a short time with a load current of more than 4 A.

A view of the installation of the device is shown in Fig.2.

The stabilizer is mounted by surface mounting on a board with dimensions of 95x45 mm. High-current circuits are made of wire with a copper cross section of 0,75 mm2. The stabilizer microcircuit is attached to a 110x100x2 mm duralumin heat sink, which is a half of the thyristor heat sink. KU221 from an old TV. UPIMCT. With such a heat sink, the microcircuit is capable of dissipating power up to 7 W (in a spacious case).

Higher power dissipation requires more efficient heat dissipation or forced airflow.

When mounting a microcircuit, it should be taken into account that its heat-removing flange is electrically connected to the output of the stabilizer (pin 2). The LX8384-00CP chip is connected to the stabilizer board with wires of the shortest possible length. Instead of the LX8384-00CP, you can use the LX8384A-00CP, LX8384B-00CP, LX8384-00IP chips. made in the body. TO-220, or one of the microcircuits in the case. TO-263, which in the designation instead of the suffixes СР, IP contain the suffixes CDD, IDD. It should be noted that in the LX8384 series, in addition to stabilizers with adjustable output voltage, there are stabilizers with a fixed output voltage, for example, LX8384-15 for an output voltage of 1,5V / 5A and LX8384-33 for an output voltage of 3,3V / 5A.

The structure of these microcircuits is shown in Fig.3.

It is advantageous to use stabilizers on LX8384 series microcircuits with a small difference between the input and output voltage, when the use of switching regulators is difficult or ineffective. The saturation voltage of microcircuits of these series is not more than 1,3. 1,5 V at a load current of 5 A.

The maximum input voltage recommended by the manufacturer should not exceed 10 V, however, the performance of these microcircuits was successfully tested at an input voltage of 12 V, an output of 7 V and a load current of 3 A, as well as at an output voltage of 5 V and a load current of 2 A.

At the same time, the cooling system provided the temperature of the IC case not higher than 50°C. The ability to power these microcircuits with an input voltage of 12 V with efficient cooling expands the scope of the stabilizers built on their basis.

The difference between the input and output voltage should not be more than 10 V.

Voltage stabilizers based on the LX8384 series microcircuits can be used to power various digital and analog devices, to stabilize the voltage in high-power battery-powered LED lamps, to supply stable voltage to subminiature electric soldering irons for soldering SMD components, etc.

Author: A.Butov, village of Kurba, Yaroslavl region

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