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LM2524DN データシート(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM2524DN
部品情報  Regulating Pulse Width Modulator
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

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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 ±1% precision 5V reference. The cur-
rent carrying capability of the output drive transistors has
been raised to 200 mA while reducing V
CEsat and increasing
V
CE breakdown to 60V. The common mode voltage range of
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
output 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
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 ±
1% precision 5V reference with thermal shut-down
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
Connection Diagram
00865002
Top View
Order Number LM2524DN or LM3524DN
See NS Package Number N16E
Order Number LM3524DM
See NS Package Number M16A
March 2005
© 2005 National Semiconductor Corporation
DS008650
www.national.com


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