The LT8303ES5TRMPBF from Linear Technology 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 the 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 450 mA, 150 V DMOS power switch is integrated along with all high-voltage circuitry and control logic into a 5-lead thinSOT™ package.
Feature
- 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
Applications
- Isolated Telecom, Datacom, Automotive, Industrial, and Medical Power Supplies
- Isolated Auxiliary/Housekeeping Power Supplies
