100Vin, 5W out regulator uses primary-side control

Features

  • 5.5V to 100V Input Voltage Range
  • 450mA, 150V Internal DMOS Power Switch
  • Up to 5W of Output Power
  • Low Quiescent Current:
     70μA in Sleep Mode
     280μA in Active Mode
  • Boundary Mode Operation at Heavy Load
  • Low-Ripple Burst Mode® Operation at Light Load
  • Minimum Load <0.5% (Typ) of Full Output
  • VOUT Set with a Single External Resistor
  • No Transformer Third Winding or Opto-Isolator
  • Required for Regulation
  • Accurate EN/UVLO Threshold and Hysteresis
  • Internal Compensation and Soft-Start
  • 5-Lead TSOT-23 Package

Typical Application100Vin, 5W out regulator uses primary-side control

Description

The LT8303 is a micropower high voltage isolated flyback converter. By sampling the isolated output voltage directly from the primary-side flyback waveform, the part requires no third winding or opto-isolator for regulation. The output voltage is programmed with a single external resistor. Internal compensation and soft-start further reduce external component count. Boundary mode operation provides a small magnetic solution with excellent load regulation. Low ripple Burst Mode operation maintains high efficiency at light load while minimizing the output voltage ripple. A 450mA, 150V DMOS power switch is integrated along with all high voltage circuitry and control logic into a 5-lead thinSOT™ package.
The LT8303 operates from an input voltages range of 5.5V to 100V and can deliver up to 5W of isolated output power. The high level of integration and the use of boundary and low ripple burst modes result in a simple to use, low component count, and high efficiency application solution for isolated power delivery.
For more detail: 100Vin, 5W out regulator uses primary-side control


About The Author

Ibrar Ayyub

I am an experienced technical writer with a Master's degree in computer science from BZU Multan University. I have written for various industries, mainly home automation and engineering. My writing style is clear and simple, and I am skilled in using infographics and diagrams. I am a great researcher and am able to present information in a well-organized and logical manner.

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