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 Op to-Isolator
- Required for Regulation
- Accurate EN/UVLO Threshold and Hysteresis
- Internal Compensation and Soft-Start
- 5-Lead TSOT-23 Package
Typical Application
Description
The LT8303 is a micro power high voltage isolated fly back converter. By sampling the isolated output voltage directly from the primary-side fly back waveform, the part requires no third winding or op to-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 thin SOT™ package.
Read More: 100Vin, 5W out regulator uses primary-side control