AN3399

Voltage regulation circuit schematics

Doc ID 018824 Rev 2

7/24

1.3

Voltage regulation and current limitation with external PNP

Figure 3.

Voltage regulation and current limitation with external PNP

This circuit is a light modification of circuit from Figure 1, extended for current limitation.

Transistor T2 (BC857) together with resistor R6 limits output current, which is possible

adjust be change or R6 value. The voltage drop at R6 for maximum current should be about

0,65 V.

Parameters of circuit form Figure 3 are following:

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Output voltage = 5 V

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Output current limited at 200 mA

●

The output voltage is possible adjust like in original schematics by change or R1 and R2

corresponds to selected output voltage.