Chips KR142EN12. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Application of microcircuits

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Chips KR142EN12A. KR142EN12B is an adjustable compensation voltage stabilizer. They are made by planar diffusion technology with insulation pn-transition. The stabilizer works with an external voltage divider in the measuring element, which allows you to adjust the output voltage in a very wide range - from 1,3 to 37 B. The regulating element of the stabilizer is included in the positive power cable. Output current (load current) - up to 1 A.

These microcircuit stabilizers are among the most "high-voltage" in the K 142 series. They are resistant to impulse power overloads, equipped with an output current overload protection system.

The instruments are packaged in a plastic case KT-28-2. On the side of one of the wide faces, an elongated heat-removing flange with a mounting hole is mounted in the case (Fig. 1). Weight of the device - no more than 2,5 g.

Electrical characteristics at T=25 deg

Minimum output voltage. V, its more, with an input voltage of 5 V and a load current of 5 mA ... 1,3
Minimum voltage drop. V, no more, at input voltage 18,5V...3,5
The instability of the output voltage by the input voltage, %/V, no more, with an increase in the input voltage from the initial value of 20 V, an output voltage of 15 V and an output current of 5 mA, for
KR142EN12A...0,01
KR142BN12B...0,03
The instability of the output voltage for the output current, % / A, no more, with an input voltage of 20 V, an output of 15 V and an increase in the output current from the initial value of 5 mA ... 0,2
Temperature coefficient of output voltage, %/'С, no more, at input voltage 5 V, minimum output voltage and output current 5 mA...0,02
Change in output voltage for 500 hours of operation, F, no more, at input voltage 45 V, output 15 V and output current 23 mA...1

Maximum permissible values ​​of parameters

Input voltage, V... 5...45
Output voltage, V...37
Output current, A...1
Power dissipated by a microcircuit without a heat sink, W, at ambient temperature
(-10...+40)'С...1
+70 "C ... 0,7
Temperature operating interval 'С...-10...+70

The chip is designed to work with a heat sink; fastening to the heat sink - a screw with a nut. The power dissipated by a chip with a heat sink must not exceed 10 watts. A printed circuit board can be used as a substitute for a heat sink. The heat sink flange of the microcircuit is electrically connected to pin 2; this must be taken into account when mounting the heat sink on the board or on. casing of the device.

A typical circuit for switching on microcircuits KR142EN12A and KR142EN12B is shown in Fig. 2.

Resistors R1 and R2 form an external adjustable voltage divider, which is included in the measuring element of the stabilizer. The resistance values ​​of the resistors must be related by the formula

where I.e.-current through the resistors R1 and R2 of the measuring element; the minimum allowable value of this current is 55 μA.

To reduce the background level at an output voltage close to the minimum, it is recommended to include a smoothing capacitor C2 in the measuring element of the stabilizer. The capacitance of this capacitor should be sufficient for effective smoothing (usually about 10 uF). The capacitance of the capacitor C1 is at least 0,1 μF, C3 is at least 1 μF.

With an output voltage exceeding 25 V, if it is possible to close the input circuit of the stabilizer, in the presence of capacitor C2, diodes V01 (KD510A) and VD2 (KD521A) should be inserted into the stabilizer; in the absence of capacitor C2, one diode VD1 is sufficient when the capacitance of capacitor C3 is greater than or equal to 25 microfarads. If the closure of only the output circuit of the stabilizer is not excluded, it is sufficient, in the presence of capacitor C2, to turn on only the diode VD2.

If there is a smoothing filter at the input of the stabilizer, and in the case when there are no switching devices between the output capacitors of the filter and the microcircuit, leading to a relatively slow increase in the input voltage, and when the length of the connecting conductors between the filter and the microcircuit does not exceed 70 mm, the input capacitor of the stabilizer can be the output filter capacitor. If the output capacitor of the filter is ceramic and its capacitance is less than -1 μF, or if it is aluminum and its capacitance is less than 10 μF, then it is necessary to turn on capacitor C1 (see Fig. 2) with a capacity of at least 0,1 μF, and it should be located at a distance no more than 70 mm from the microcircuit.

To maximize the stabilizing qualities of the microcircuit, it is necessary to connect the resistive voltage divider R1R2 and the output capacitor C3 as close as possible to its output, and mount the microcircuit in close proximity to the load.

Figure 3 shows the load characteristic of the stabilizer, illustrating the operation of the overload protection device (the zone of technological spread of parameters is shaded). The frequency response of the output voltage ripple smoothing factor is shown in Fig.4.

Figure 5 shows the dependence of the output current on the voltage drop across the microcircuit. The ascending section of the curve corresponds to the output of the microcircuits to the operating mode with the maximum output current. The second straight section is a working one.

When a certain threshold value of the voltage drop is reached, the protection system is triggered and the operating point moves to the third - the curvilinear section of the curve, which characterizes the mode of limiting the output current and the power dissipated by the microcircuit.

Authors: A. Nefedov, V. Golovina, Moscow; Publication: N. Bolshakov, rf.atnn.ru

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