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