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TRANSCRIPT
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LINEAR INTEGRATED CIRCUITS
SUBMITTED BY
PRADEEPA RAJENDRAN
115011013898
BTECH ECE 2ND YR
All Rights reserved. Not for distribution. Single user license
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VOLTAGE REGULATOR*Introduction
*Series op-AMP Regulator*Ic Voltage Regulators
*Characteristics*General Purpose Regulator
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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.
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SERIES OF OP-AMP REGULATOR
Reference voltage circuit
1Error amplifier
2Series pass
transistor and feedback network
3
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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
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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.
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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
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TYPES OF VOLTAGE REGULATOR ;
•SERIES REGULATOR•SWITCHING REGULATOR
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THE THREE TERMINAL REGULATORS DISCUSSED EARLIER HAVE THE FOLLOWING
LIMITATIONS;
1.No short circuit protection2.Output voltage (positive or
negative )is fixed.
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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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