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LM3524D

ACTIVO

Controlador PWM de 40 V, 0.2 A y 350 KHz

Detalles del producto

Topology Full bridge Control mode Voltage Features Adjustable switching frequency, Error amplifier, Multi-topology, Synchronization pin Duty cycle (max) (%) 90
Topology Full bridge Control mode Voltage Features Adjustable switching frequency, Error amplifier, Multi-topology, Synchronization pin Duty cycle (max) (%) 90
SOIC (D) 16 59.4 mm² (9.9 mm × 6 mm)
  • Fully Interchangeable With Standard LM3524 Family
  • ±1% Precision 5V Reference With Thermal Shut-Down
  • Output Current to 200 mA DC
  • 60V Output Capability
  • Wide Common Mode Input Range for Error-Amp
  • One Pulse per Period (Noise Suppression)
  • Improved Max. Duty Cycle at High Frequencies
  • Double Pulse Suppression
  • Synchronize Through Pin 3

All trademarks are the property of their respective owners.

  • Fully Interchangeable With Standard LM3524 Family
  • ±1% Precision 5V Reference With Thermal Shut-Down
  • Output Current to 200 mA DC
  • 60V Output Capability
  • Wide Common Mode Input Range for Error-Amp
  • One Pulse per Period (Noise Suppression)
  • Improved Max. Duty Cycle at High Frequencies
  • Double Pulse Suppression
  • Synchronize Through Pin 3

All trademarks are the property of their respective owners.

The LM3524D family is an improved version of the industry standard LM3524. It has improved specifications and additional features yet is pin for pin compatible with existing 3524 families. New features reduce the need for additional external circuitry often required in the original version.

The LM3524D has a ±1% precision 5V reference. The current carrying capability of the output drive transistors has been raised to 200 mA while reducing VCEsat and increasing VCE 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 amplitude 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 externally, 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 insures 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.

The LM3524D family is an improved version of the industry standard LM3524. It has improved specifications and additional features yet is pin for pin compatible with existing 3524 families. New features reduce the need for additional external circuitry often required in the original version.

The LM3524D has a ±1% precision 5V reference. The current carrying capability of the output drive transistors has been raised to 200 mA while reducing VCEsat and increasing VCE 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 amplitude 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 externally, 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 insures 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.

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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos LM2524D/LM3524D Regulating Pulse Width Modulator datasheet (Rev. E) 2/05/2013
Nota sobre la aplicación AN-715 LM385 Feedback Provides Regulator Isolation (Rev. A) 6/05/2013
Nota sobre la aplicación AN-288 System-Oriented DC-DC Conversion Techniques (Rev. B) 6/05/2013
Nota sobre la aplicación AN-694 A DMOS 3A, 55V, H-Bridge: The LMD18200 (Rev. C) 26/04/2013
Nota sobre la aplicación Applications of the LM3524 Pulse Width Modulator (Rev. B) 23/04/2013
Nota sobre la aplicación AN-272 Op Amp Booster Designs (Rev. B) 23/04/2013

Diseño y desarrollo

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Esta herramienta ayuda a un ingeniero de fuentes de alimentación a seleccionar la topología CC-CC aislada adecuada en función de las especificaciones. Según la topología elegida, la calculadora también recomienda el CI adecuado para el diseño.

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Pedidos y calidad

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