National Semiconductor - LM2524D LM3524D Regulating PWM Controller Data Sheet Manual
Summary
This comprehensive manual provides technical specifications for the LM2524D/LM3524D, a high-precision Pulse Width Modulator (PWM) regulating device. It is designed for engineers requiring reliable power regulation and a stable ±1% precision 5V reference in sensitive electronic systems. The document details operational capabilities across electrical sections—including output voltage, oscillator, and error-amplifier performance—covering absolute maximum ratings, temperature ranges, and crucial characteristics like noise suppression and synchronization features for demanding industrial and commercial designs.
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May 2, 2008
LM2524D/LM3524D Regulating Pulse Width Modulator
pulse per period even in noisy environments. The LM3524D
General Description
includes double pulse suppression logic that insures when a
The LM3524D family is an improved version of the industry shut-down condition is removed the state of the T-flip-flop will standard LM3524. It has improved specifications and addi- change only after the first clock pulse has arrived. This feature tional features yet is pin for pin compatible with existing 3524 prevents the same output from being pulsed twice in a row, families. New features reduce the need for additional external thus reducing the possibility of core saturation in push-pull circuitry often required in the original version. designs. The LM3524D has a ±1% precision 5V reference. The current carrying capability of the output drive transistors has been Features raised to 200 m A while reducing VCEsat and increasing VCE
Fully interchangeable with standard LM3524 family
breakdown to 60V. The common mode voltage range of the
±1% precision 5V reference with thermal shut-down
error-amp has been raised to 5.5V to eliminate the need for
a resistive divider from the 5V reference. Output current to 200 m A DC In the LM3524D the circuit bias line has been isolated from 60V output capability
the shut-down pin. This prevents the oscillator pulse ampli-
Wide common mode input range for error-amp
tude and frequency from being disturbed by shut-down. Also
One pulse per period (noise suppression)
at high frequencies (≃300 k Hz) the max. duty cycle per output
Improved max. duty cycle at high frequencies
has been improved to 44% compared to 35% max. duty cycle
in other 3524s. Double pulse suppression In addition, the LM3524D can now be synchronized external- Synchronize through pin 3
ly, through pin 3. Also a latch has been added to insure one
Connection Diagram
Top View
Order Number LM2524DN or LM3524DN See NS Package Number N16E Order Number LM3524DM See NS Package Number M16A
© 2008 National Semiconductor Corporation www.national.com
Page Summary Contents For National Semiconductor - LM2524D LM3524D Regulating PWM Controller Data Sheet Manual
Manual Details
| Brand | National |
|---|---|
| Pages | 22 |
| File Size | 1.05 MB |
| Published | May 27, 2026 |
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Frequently Asked Questions
What are the primary benefits of using the LM3524D over previous models?
It features double pulse suppression logic for noise resistance, an improved high-frequency duty cycle up to 44%, and a ±1% precision 5V reference.
Is the LM3524D compatible with standard parts families?
Yes, it is pin-for-pin compatible and fully interchangeable with existing standard LM2524 and LM3524 families.
What is the maximum continuous output current capability?
The output current (DC) for both models has been increased to 200 mA.
How can the device be externally synchronized?
It can be synchronized externally through pin 3, which also supports a dedicated latch connection.