LinkSwitch®-XT Family Energy Efficient, Low Power Off-Line Switcher IC

Description
LinkSwitch-XTincorporates a 700 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 startup and operating power are derived directly from the DRAIN pin, eliminating the need for a bias winding and associated circuitry.

Product Highlights
Optimized for Lowest System Cost
•  Proprietary IC trimming and transformer construction techniques enable Clampless™ designs with LNK362 for lower system cost, component count and higher efficiency
•  Fully integrated auto-restart for short circuit and  open loop protection
•  Self-biased supply – saves transformer auxiliary winding and associated bias supply components
•  Frequency jittering greatly reduces EMI
•  Meets HV creepage requirements between DRAIN and all other pins both on the PCB and at the package
•  Lowest component count switcher solution

Features Superior to Linear/RCC
•  Accurate hysteretic thermal shutdown protection –  automatic recovery improves field reliability
•  Universal input range allows worldwide operation
•  Simple ON/OFF control, no loop compensation needed
•  Eliminates bias winding – simpler, lower cost transformer
•  Very low component count – higher reliability and single  side printed circuit board
•  Auto-restart reduces delivered power by 95% during  short circuit and open loop fault conditions
•  High bandwidth provides fast turn-on with no overshoot  and excellent transient load response
EcoSmart®
– Extremely Energy-Efficient
•  Easily meets all global energy efficiency regulations with no added components
• No-load consumption <300 mW without bias winding at 265 VAC input (<50 mW with bias winding)
•  ON/OFF control provides constant efficiency to very light loads – ideal for mandatory CEC regulations

Applications
•  Chargers/adapters for cell/cordless phones, PDAs, digital cameras, MP3/portable audio players, and shavers
•  Supplies for appliances, industrial systems, and metering