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IC Voltage Regulator
Introduction
IC voltage regulators are versatile and relatively inexpensive and
are
available with features such as a programmable output, currentvoltage boosting, internal short-circuit current 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 protection
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
elements 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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