Analog Devices LT8315

Description

The LT®8315 is a high voltage flyback converter with integrated630V/300mA switch. No opto-isolator is needed forregulation. The device samples the output voltage from theisolated flyback waveform appearing across a third windingon the transformer. Quasi-resonant boundary modeoperation improves load regulation, reduces transformersize, and maintains high efficiency.At start-up, the LT8315 charges its INTVCC capacitor via acurrent source attached to the DRAIN pin. During normaloperation, the current source turns off and the devicedraws its power from a third winding on the transformer.The LT8315 operates from a wide range of input supplyvoltages and can deliver up to 15W of power. It is availablein a thermally enhanced 20-pin TSSOP package with fourpins removed for high-voltage spacing.

Features

Remark: Design Note 559 contain same inputs, outputs and circuit diagram so datafile is addednn Wide Input Voltage Range: 18V to 560Vnn 630V/300mA Integrated Power Switchnn No Opto-Isolator Required for Regulationnn Quasi-Resonant Boundary Mode Operationnn Constant-Current and Constant-Voltage Regulationnn Low-Ripple Light Load Burst Mode® Operationnn Low Quiescent Current: 70μAnn Programmable Current Limit and Soft-Startnn TSSOP Package with High-Voltage Spacing

Typical applications

• Electric Vehicles and Battery Stacks
• Isolated Telecom, Automotive, Industrial, Medical Power Supplies, Isolated Off-Line Housekeeping Power Supplies

More information

• Datasheet
• IC product information