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LM3578AMN/a500avaiSwitching Regulator
LM3578AMNSN/a37919avaiSwitching Regulator
LM3578AMNS ?N/a180avaiSwitching Regulator
LM3578AM= |LM3578AMNSN/a696avaiSwitching Regulator
LM3578AMXNSN/a51033avaiSwitching Regulator
LM3578ANN/a26avaiSwitching Regulator
LM2578AMNS ?N/a95avaiSwitching Regulator
LM2578AMNSN/a3000avaiSwitching Regulator
LM2578AMNSCN/a60avaiSwitching Regulator
LM2578AMXNSC ?N/a17avaiSwitching Regulator
LM2578ANNSN/a100avaiSwitching Regulator
LM2578ANNSCN/a995avaiSwitching Regulator


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LM2578AM-LM2578AMX-LM2578AN-LM3578AM-LM3578AM=-LM3578AMX-LM3578AN
Switching Regulator
LM1578A/LM2578A/LM3578A
Switching Regulator
General Description

The LM1578Aisa switching regulator whichcan easilybe
setupfor such DC-to-DC voltage conversion circuitsasthe
buck, boost,and inverting configurations.The LM1578Afea-
turesa unique comparator input stage whichnot onlyhas
separatepinsfor boththe invertingand non-inverting inputs,
but also providesan internal 1.0V referenceto each input,
thereby simplifying circuit designandp.c. board layout.The
outputcan switchupto750mAandhas output pinsforits
collectorand emitterto promotedesign flexibility.Anexternal
currentlimit terminal maybe referencedto eitherthe groundtheVin terminal, depending uponthe application.In addi-
tion,the LM1578Ahasanon board oscillator, whichsetsthe
switching frequencywitha single external capacitor from<1to100kHz (typical).
The LM1578Aisan improved versionofthe LM1578, offer-
ing higher maximum ratingsforthe total supply voltageand
output transistor emitterand collector voltages.
Features
Invertingand non-inverting feedback inputs 1.0V referenceat inputs Operates from supply voltagesof2Vto40V Output currentupto750 mA, saturationless than 0.9V Current limitand thermal shut down Duty cycleupto 90%
Applications
Switching regulatorsin buck, boost, inverting,and
single-ended transformer configurations Motor speed control Lamp flasher
Functional Diagram

DS008711-1
April 1998
LM1578A/LM2578A/LM3578A
Switching
Regulator

©1998NationalSemiconductor Corporation DS008711
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