LINEAR INTEGRATED CIRCUITS

SUBMITTED BY

PRADEEPA RAJENDRAN

115011013898

BTECH ECE 2ND YR

All Rights reserved. Not for distribution. Single user license

VOLTAGE REGULATOR*Introduction

*Series op-AMP Regulator*Ic Voltage Regulators

*Characteristics*General Purpose Regulator

VOLTAGE REGULATOR*A Voltage regulator should be

capable of providing substantial output current.

*The function of a voltage regulator is to provide a stable dc voltage for

powering other electronic circuits.

SERIES OF OP-AMP REGULATOR

Reference voltage circuit

1Error amplifier

2Series pass

transistor and feedback network

3

CHARACTERISTICS

The regulated output voltage is fixed at a value as specified by the manufacturer.

1

The unregulated input voltages must be at least 2V more than the regulated output voltage.

2

The load current may vary from 0 to rated maximum output current .The IC is usually provided with a heat sink.

3

The output current will drop and remains there until the IC has cooled significantly.

4

LINE /INPUT REGULATIONIt is defined as the percentage change in the

output voltage for a change in the input voltage. It is is usually expressed in millivolts or as a

percentage of the output voltage. Typical value of line regulation from the data sheet of 7805 is

3mV.

Many discrete and IC circuits (such as op-amp) require bipolar

supplies . This can be easily done with two three terminal regulators.

DUAL VOLTAGE SUPPLY

TYPES OF VOLTAGE REGULATOR ;

•SERIES REGULATOR•SWITCHING REGULATOR

THE THREE TERMINAL REGULATORS DISCUSSED EARLIER HAVE THE FOLLOWING

LIMITATIONS;

1.No short circuit protection2.Output voltage (positive or

negative )is fixed.

SWITCHING REGULATOR

The regulated power supplies discussed so far are referred

to as linear voltage regulator , since the series pass transistor operates in

the linear region .

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