Adjustable voltage stabilizers 2,5-30 volts on the KR142EN19 chip. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Surge Protectors
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The scheme of a low-power adjustable voltage regulator is shown in the figure. It is implemented on the KR142EN19 microcircuit, which is a parallel voltage regulator, with a stabilization current of 1 ... 100 mA and an output voltage range of 2,5 to 30 V. The maximum power dissipated by the microcircuit is 0.4 W, the differential resistance is not more than 0.5 Ohm. The control input current of the microcircuit can be 5 μA, so it is advisable to choose a current through the resistive divider of at least 0.5 mA. The resistance of the ballast resistor R1 can be calculated by the formula: R1=(Uin.- ORout.)/(IArt. min..+Ipart.+In. Max.). Where IArt. min.. - can be taken equal to 1 mA. The stabilization coefficient is calculated in the same way as for parametric stabilizers on zener diodes. The output voltage of the stabilizer is determined by the formula: Uout.=2.5 (1+R2/R3).
The following figure shows a variant of an adjustable voltage regulator, with a large load current. It is assembled on KR142EN5, KR142EN19 microcircuits, and in comparison with single-case stabilizers of this series, at the same power, it has slightly better technical characteristics. The resistive divider, in this case, is connected between the output of the stabilizer and the common wire, which significantly increases the stability of the output voltage. To increase the output current of the stabilizer, between pins 1 and 3 of the DA1 chip, you can turn on the shunt resistor RX, the stabilization coefficient will decrease accordingly.
The output voltage of the stabilizer is determined by the same ratio as in the previous circuit, only the stabilization voltage of the DA1 microcircuit is added to it. Thus, the minimum output voltage - in this case will be 7.5 V.
Publication: cxem.net
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