Adjustable stabilizer 0,7-12 volts. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Adjustable stabilizer 0,7-12 volts. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Surge Protectors

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Reducing the voltage almost to zero at the output of an adjustable voltage regulator can be achieved according to the circuit shown in the figure.

Adjustable stabilizer 0,7-12 volts

The output voltage of the microassembly U1 (adjustable pulse DC-DC converter) is automatically maintained due to feedback so that the voltage at its output VadJ remains equal to the internal reference (2,5 V). This usually determines the minimum output stabilized voltage. However, if you introduce a battery GB1 and a diode VD1 into the feedback circuit, then with the variable resistor R1 in the upper position according to the diagram, the stabilized voltage will become less than the reference voltage by the battery voltage minus its drop across the diode.

In practice, when using two partially discharged galvanic cells with a total voltage of 1 V as GB2,7, it was possible to lower the output voltage to 0,673 V.

Note that you must not introduce a bias in excess of the reference voltage into the external feedback circuit. This will disrupt the operation of the stabilizer. And when the variable resistor R1 is in the lower position according to the diagram, the external feedback circuit is broken. However, the VD1 diode is closed in this case, and the internal feedback circuit present in the HRD12003E microassembly maintains the output voltage equal to the nominal voltage (12 V).

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