Electronic Circuits by Intellin Organization

Author:Intellin Organization [Organization, Intellin]
Language: eng
Format: epub, azw3, pdf
Published: 2014-11-26T23:00:00+00:00

60 Low Drop Regulator

Diagram 60.0 Low Drop Regulator

2SC3622

2SC3245

2SC3248

bottom view MJ2955

2SB722

2SA1147

This power supply regulator has the following characteristics: a) very low voltage drop of less than 1V. b) negligible standby current from 20 to 30 µA. c) variable but very stable output.

These characteristics make the circuit practical in some applications compared with the 3-terminal IC regulator which has high voltage drop and standby current consumption. Specially in battery operated applications, the discrete regulator featured here is highly recommended.

The circuit is basically a series regulator that uses a normal LED to produce the reference voltage. The given component values deliver a variable output from 2V up to 8V. If you intend to increase it up to 16V, change R4 with 220 kiloohms. Eventually, you need to increase the value of P1. The maximum current that can be delivered by the regulator circuit depends on the type of the series transistor used and the difference between the input and output voltages.

Figure 60.0 Printed Circuit Layout Figure 60.1 Parts Placement Layout

Figure 60.2 External wiring layout of the low drop regulator. Take note that two terminals of the potentiometer P1 must be shorted together. Transistor T1 must be properly heatsinked.

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