Analog Devices LT8315

Description

In traditional isolated high voltage flyback converters,tight regulation is achieved using opto-couplers totransfer regulation information from the secondarysidereference circuitry to the primary side. The problemis that opto-couplers add significant complexityto isolated designs: there is propagation delay, aging,and gain variation, all of which complicate powersupply loop compensation and can reduce reliability.Moreover, during start-up, either a bleeder resistoror high voltage start-up circuit is required to initiallypower up the IC. Unless an additional high voltageMOSFET is added to the start-up components, thebleeder resistor is a source of unwelcome power loss.The LT®8315 is a high voltage flyback converterwith an integrated 630V/300mA switch. The LT8315eliminates the need for an opto-coupler, complicatedsecondary-side reference circuitry, additional start-upcomponents, and an external high voltage MOSFET.

More information

• Datasheet
• IC product information