LM494CJ ,Pulse Width Modulated Control CircuitLM494PulseWidthModulatedControlCircuitJune1989LM494PulseWidthModulatedControlCircuitGeneralDescript ..
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LM494CJ
Pulse Width Modulated Control Circuit
TL/H/10056
LM494
Pulse
Width
Modulated
Control
Circuit
June 1989
LM494
Pulse Width Modulated Control Circuit
General Description
The LM494isa monolithic integrated circuit which includes
allthe necessary building blocksforthe designof pulse
width modulated (PWM) switching power supplies, including
push-pull, bridgeand series configurations.The devicecan
operateat switching frequencies between1.0 kHz and
300kHzand output voltagesupto 40V.The operating tem-
perature range specifiedforthe LM494Cis 0§Cto70§Cand
forthe LM494Vis b40§Cto a85§C.
Features Uncommitted output transistors capableof 200 mA
sourceor sink On-chip error amplifiers On-chip 5.0V reference Internal protection from double pulsingof outputs with
narrow pulse widthsor with supply voltages below
specified limits Dead time control comparator Output control selects single endedor push-pull opera-
tion Easily synchronized (slaved)to other circuits
Block Diagram
TL/H/10056–2
Connection Diagram
16-LeadDIP
TL/H/10056–1
Top View
Ordering Information
Device Package Package
Code Code Description
LM494IN N16A MoldedDIP
LM494CJ J16A CeramicDIP
LM494CN N16A MoldedDIP
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
