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.