100VIN Micropower Isolated Flyback Converter with 150V/260mA Switch


Features
■ 6V to 100V Input Voltage Range
■ 260mA, 150V Internal DMOS Power Switch
■ Low Quiescent Current:
70µA in Sleep Mode
330µA 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, Automotive, Industrial, Medical Power Supplies
■ solated Auxiliary/Housekeeping Power Supplies

Description
The LP8300 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 oropto-isolatorfor regulation. Theoutput 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 260mA, 150V DMOS power switch is integrated along with all high voltage circuitry and control logic into a5-lead ThinSOT™ package.
The LT8300 operates from an input voltages range of 6V to 100V and can deliver up to 2W 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.