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.