LM494 Datasheet, PDF (1/8 Pages) National Semiconductor (TI) – Pulse Width Modulated Control Circuit

June 1989
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 b40 C to a85 C
Features
Y _{Uncommitted output transistors capable of 200 mA}
source or sink
Y _{On-chip error amplifiers}
Y _{On-chip 5 0V reference}
Y _{Internal protection from double pulsing of outputs with}
narrow pulse widths or with supply voltages below
specified limits
Y _{Dead time control comparator}
Y _{Output control selects single ended or push-pull opera-}
tion
Y _{Easily synchronized (slaved) to other circuits}
Block Diagram
Connection Diagram
16-Lead DIP
Ordering Information
Device
Code
LM494IN
LM494CJ
LM494CN
Package
Code
N16A
J16A
N16A
TL H 10056 – 2
Package
Description
Molded DIP
Ceramic DIP
Molded DIP
Top View
C1995 National Semiconductor Corporation TL H 10056
TL H 10056 – 1
RRD-B30M115 Printed in U S A