LM3524 National Semiconductor, LM3524 Datasheet
LM3524
Manufacturer Part Number
LM3524
Description
Regulating Pulse Width Modulator
Manufacturer
National Semiconductor
Datasheet
1.LM3524.pdf
(19 pages)
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© 1999 National Semiconductor Corporation
LM2524D/LM3524D
Regulating Pulse Width Modulator
General Description
The LM3524D family is an improved version of the industry
standard LM3524. It has improved specifications and addi-
tional features yet is pin for pin compatible with existing 3524
families. New features reduce the need for additional exter-
nal circuitry often required in the original version.
The LM3524D has a
rent carrying capability of the output drive transistors has
been raised to 200 mA while reducing V
V
the error-amp has been raised to 5.5V to eliminate the need
for a resistive divider from the 5V reference.
In the LM3524D the circuit bias line has been isolated from
the shut-down pin. This prevents the oscillator pulse ampli-
tude and frequency from being disturbed by shut-down. Also
at high frequencies ( 300 kHz) the max. duty cycle per out-
put has been improved to 44% compared to 35% max. duty
cycle in other 3524s.
In addition, the LM3524D can now be synchronized exter-
nally, through pin 3. Also a latch has been added to insure
Block Diagram
CE
breakdown to 60V. The common mode voltage range of
±
1% precision 5V reference. The cur-
CEsat
DS008650
and increasing
one pulse per period even in noisy environments. The
LM3524D includes double pulse suppression logic that in-
sures when a shut-down condition is removed the state of
the T-flip-flop will change only after the first clock pulse has
arrived. This feature prevents the same output from being
pulsed twice in a row, thus reducing the possibility of core
saturation in push-pull designs.
Features
n Fully interchangeable with standard LM3524 family
n
n Output current to 200 mA DC
n 60V output capability
n Wide common mode input range for error-amp
n One pulse per period (noise suppression)
n Improved max. duty cycle at high frequencies
n Double pulse suppression
n Synchronize through pin 3
±
1% precision 5V reference with thermal shut-down
DS008650-1
www.national.com
June 1999