560V Micropower No-Opto Isolated Flyback Controller

The LT8316 is a micropower, high voltage flyback controller. No opto-isolator is needed for regulation. The device samples the output voltage from the isolated flyback waveform appearing across a third winding on the transformer. Quasi-resonant boundary mode operation improves load regulation, reduces transformer size, and maintains high efficiency.

At start-up, the LT8316 charges its INTVCC capacitor via a high voltage current source. During normal operation, the current source turns off and the device draws its power from a third winding on the transformer minimizing standby power dissipation.

The LT8316 operates from a wide range of input supply voltages and can deliver up to 100W of power. It is available in a thermally enhanced 20-pin TSSOP package with four pins removed for high-voltage spacing.

APPLICATIONS

* Isolated Telecom, Automotive, Industrial, Medical Power Supplies

* Isolated Off-Line Housekeeping Power Supplies

* Electric Vehicles and Battery Stacks

* Multioutput Isolated Power Supplies for Inverter Gate Drives

* Wide Input Voltage Range: 16V to 560V (600V max)

* No Opto-Isolator Required for Regulation

* Quasi-Resonant Boundary Mode Operation

* Constant-Current and Constant-Voltage Regulation

* Low-Ripple Light Load Burst Mode® Operation

* Low Quiescent Current: 75μA