Analog Devices LT8315

Description

In traditional isolated high voltage flyback converters, tight regulation is achieved using opto-couplers to transfer regulation information from the secondaryside reference circuitry to the primary side. The problem is that opto-couplers add significant complexity to isolated designs: there is propagation delay, aging, and gain variation, all of which complicate power supply loop compensation and can reduce reliability. Moreover, during start-up, either a bleeder resistor or high voltage start-up circuit is required to initially power up the IC. Unless an additional high voltage MOSFET is added to the start-up components, the bleeder resistor is a source of unwelcome power loss. The LT®8315 is a high voltage flyback converter with an integrated 630V/300mA switch. The LT8315 eliminates the need for an opto-coupler, complicated secondary-side reference circuitry, additional start-up components, and an external high voltage MOSFET.

Features

• Wide Input Voltage Range: 18V to 560V
• 630V/300mA Integrated Power Switch
• No Opto-Isolator Required for Regulation
• Quasi-Resonant Boundary Mode Operation
• Constant-Current and Constant-Voltage Regulation
• Low Ripple Light Load Burst ModeR Operation
• Low Quiescent Current: 70μA
• Programmable Current Limit and Soft-Start
• TSSOP Package with High Voltage Spacing

Typical applications

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

More information

• Datasheet
• IC product information