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LM3101 Datasheet

  • LM3101

  • National Semiconductor [Secondary-Side PWM Controller]

  • NSC

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LM3101 Secondary-Side PWM Controller
January 1995
LM3101 Secondary-Side PWM Controller
General Description
The LM3101 is a precision high-speed PWM controller It is
designed to provide secondary-side feedback for offline
Switch-Mode Power Supplies (SMPS) using pulse communi-
cation to the primary-side driver The LM3101 is applicable
in all of the popular converter topologies such as flyback or
forward
The LM3101 combined with its companion LM3001 Primary-
Side Driver forms a regulator chip-set that provides preci-
sion control of offline or other isolated DC DC converters
The communication is realized between the two chips by a
small pulse transformer with one or two turns on its primary
and secondary This type of communication does not intro-
duce any poles or zeroes in the control loop and yields the
fastest possible loop response for the isolated switching
regulator
The secondary-side controller contains a precision 1 242V
reference an error amplifier and a trimmed oscillator which
is programmed with a single resistor The LM3101 can real-
ize voltage current or charge mode control Power supply
monitor features include power-on reset with programmable
delay and overvoltage protection
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
g
2% precision voltage reference
Wide-bandwidth (8 MHz) error amplifier
External synchronization
Frequency shift during an output short circuit
Power-on reset flag with programmable delay
Overvoltage crowbar trigger circuit
Ramped reference Soft-Start
Operation beyond 1 MHz
Voltage current or charge mode control
Typical Applications
Y
Y
Y
Y
Isolated offline switching power supplies
Isolated DC DC power converters
Flyback regulator
Forward converter
Block Diagram
TL H 11436 鈥?1
C
1995 National Semiconductor Corporation
TL H 11436
RRD-B30M75 Printed in U S A

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