Voltage regulator with a small difference between input and output parameters. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Voltage regulator with a small difference between input and output parameters. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Power Supplies

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A distinctive feature of this regulator is its ability to regulate the voltage when the input and output voltages are almost equal. (Most 3-pin voltage regulators require a difference between input and output voltage of about 3 volts for normal operation.)

Voltage regulator with a small difference between input and output parameters

To cater for situations where the two voltages are nearly equal, discrete components must be used. The BD140 transistor must be installed on a radiator, the power dissipated on the transistor is about 5-6 watts.

The output voltage level is determined by the formula Uo={(R4+R5)/R5}*Uzener.

See other articles Section Power Supplies.

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