LM494 National Semiconductor, LM494 Datasheet
LM494
Manufacturer Part Number
LM494
Description
Pulse Width Modulated Control Circuit
Manufacturer
National Semiconductor
Datasheet
1.LM494.pdf
(8 pages)
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C 1995 National Semiconductor Corporation
LM494
Pulse Width Modulated Control Circuit
General Description
The LM494 is a monolithic integrated circuit which includes
all the necessary building blocks for the design of pulse
width modulated (PWM) switching power supplies including
push-pull bridge and series configurations The device can
operate at switching frequencies between 1 0 kHz and
300 kHz and output voltages up to 40V The operating tem-
perature range specified for the LM494C is 0 C to 70 C and
for the LM494V is
Block Diagram
Connection Diagram
b
40 C to
16-Lead DIP
Top View
a
TL H 10056
85 C
TL H 10056 – 1
Features
Y
Y
Y
Y
Y
Y
Y
Ordering Information
Uncommitted output transistors capable of 200 mA
source or sink
On-chip error amplifiers
On-chip 5 0V reference
Internal protection from double pulsing of outputs with
narrow pulse widths or with supply voltages below
specified limits
Dead time control comparator
Output control selects single ended or push-pull opera-
tion
Easily synchronized (slaved) to other circuits
LM494IN
LM494CJ
LM494CN
Device
Code
Package
Code
N16A
N16A
J16A
RRD-B30M115 Printed in U S A
TL H 10056 – 2
Description
Molded DIP
Ceramic DIP
Molded DIP
Package
June 1989
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