IC Voltage Regulator

Introduction

IC voltage regulators are versatile and relatively inexpensive and

are available with fea tures such as a programmable output,

current-voltage boosting, internal short-circuit cur rent limiting,

thermal shutdown, and floating operation for high voltage

applications

Voltage Regulator

Voltage regulators comprise a class of widely

employed ICs.

Regulator IC units contain the circuitry for

reference source, comparator amplifier, control

device, and overload pro tection all in a single IC. 

IC Voltage Regulator Block Diagram

Voltage Regulators Except for the, switching regulators, all other types

of regulators are linear regulators.

The impedance of the active element of the linear

regulator provide a desired current to the load,

on the other hand, in a switching regulator.

A switch is turned on and off at a rate such that the

regulator provides the desired average current in

periodic pulses to the load. 

Voltage Regulator internal Animation

Fixed voltage Regulator

IC Voltage Regulator types

Fixed output voltage regulators: positive and/or

negative output voltage.

Adjustable output voltage regulators: positive or

negative output voltage.

Switching regulators.

Special regulators.

Switching Regulators

The switching regulators are more efficient than the

linear regulators.

This is because there is negligible power dissipation

in switching ele ments in either the on or off state.

Switching Regulator circuit

Fixed output voltage Regulator

The fixed voltage regulator has an unregulated dc

input voltage Vin, applied to one input terminal,

a regulated output dc voltage, Vout from a  

second terminal, with the third terminal connected

to ground.

Fixed output voltage Regulator

Adjustable output voltage Regulator

The adjustable voltage regulator implies that the

input voltage must be at least 2 V greater than

output voltage i.e. input voltage must be at least 7

V, because its output voltage is 5 V.

New devices can supply load current from 100 mA

to more than 5 A. 

Adjustable output voltage Regulator

Special Regulators

The special regulators are employed as control

circuits in pulse width modulation, push-pull

bridges, and series type switch mode supplies.

Almost all power supplies make use of some type

of voltage regulator IC

Special Regulator

The End

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