Easy to Design

? Lowest component count switcher solution

? Selectable device current limit

? Fully integrated auto-restart for short-circuit and open-loop

protection

? Optional self-biased supply

? Frequency jittering greatly reduces EMI

? Meets HV creepage requirements between DRAIN and all other pins

both on the PCB and at the package

? Pin-out simplifies PCB heat sinking

Features Superior to Linear/RCC

? Output overvoltage protection (OVP)

? Input overvoltage line protection (OVL)

? Hysteretic over-temperature protection (OTP)

? Extended creepage between DRAIN pin and all other pins improves

field reliability

? 725 V MOSFET rating series for excellent surge withstand

? 900 V MOSFET rating series for industrial design or extra safety

margin

? Extremely low component count enhances reliability

? Allows single-sided PCB and full SMD manufacturability

EcoSmart? – Extremely Energy-Efficient

? Easily meets all global energy efficiency regulations

? No-load consumption <100 mW without bias winding at 265 VAC

input (<10 mW with bias winding)

? ON/OFF control provides constant efficiency to very light loads

Applications

? Flyback converters

? Supplies for appliances, industrial systems, and metering

Description

LinkSwitch?-XT2 incorporates a 725 V / 900 V power MOSFET,

oscillator, simple ON/OFF control scheme, a high-voltage switched

current source, frequency jittering, cycle-by-cycle current limit and

thermal shutdown circuitry onto a monolithic IC. The start-up and

operating power are derived directly from the DRAIN pin, eliminating

the need for a bias winding and associated circuitry.