60V Low I No-Opto Isolated Flyback Controller

The LT8306 is a micropower isolated flyback controller in a 6-lead ThinSOT™ package. 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. The LT8306 drives a low side N-channel power MOSFET with 8V gate drive.

The LT8306 has a wide input voltage range of 4.5V to 60V. 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.

APPLICATIONS

* Isolated Telecom, Automotive, Industrial, Medical Power Supplies

* Isolated Auxiliary/Housekeeping Power Supplies

* Wide Input Voltage Range: 4.5V to 60V

* Low Quiescent Current

* 120μA in Sleep Mode

* 390μA in Active Mode

* Quasi-Resonant 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