LNK304DG-TL AC/DC offline switch, 85-265 VAC, 120mA, SO-8C-7

LNK302/304-306 LinkSwitch-TN Family Lowest Component Count, Energy-Efficient Off-Line Switcher IC

Product Highlights Cost Effective Linear/Cap Dropper Replacement - Lowest cost and component count buck converter solution - Fully integrated auto-restart for short-circuit and open loop fault protection - save external component costs - LNK302 uses a simplified controller without auto-restart for very low system cost - 66 kHz operation with accurate current limit - allows low cost off-the-shelf 1 mH inductor for up to 120 mA output current - Tight tolerances and negligible temperature variation - High breakdown voltage of 700 V provides excellent input surge withstand - Frequency jittering dramatically reduces EMI (~10 dB) - Minimizes EMI filter cost - High thermal shutdown temperature (+135 °C minimum)

Much Higher Performance Over Discrete Buck and Passive Solutions - Supports buck, buck-boost and flyback topologies - System level thermal overload, output short-circuit and open control loop protection - Excellent line and load regulation even with typical configuration - High bandwidth provides fast turn-on with no overshoot - Current limit operation rejects line ripple - Universal input voltage range (85 VAC to 265 VAC) - Built-in current limit and hysteretic thermal protection - Higher efficiency than passive solutions - Higher power factor than capacitor-fed solutions - Entirely manufacturable in SMD

EcoSmart™- Extremely Energy Efficient - Consumes typically only 50/80 mW in self-powered buck topology at 115/230 VAC input with no-load (opto feedback) - Consumes typically only 7/12 mW in flyback topology with external bias at 115/230 VAC input with no-load - Meets California Energy Commission (CEC), Energy Star, and EU requirements

Description LinkSwitch-TN is specifically designed to replace all linear and capacitor-fed (cap dropper) non-isolated power supplies in the under 360 mA output current range at equal system cost while offering much higher performance and energy efficiency. LinkSwitch-TN devices integrate 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 start-up and operating power are derived directly from the voltage on the DRAIN pin, eliminating the need for a bias supply and associated circuitry in buck or flyback converters. The fully integrated auto-restart circuit in the LNK304-306 safely limits output power during fault conditions such as short-circuit or open loop, reducing component count and system-level load protection cost. A local supply provided by the IC allows use of a nonsafety graded optocoupler acting as a level shifter to further enhance line and load regulation performance in buck and buck-boost converters, if required.

Applications - Appliances and timers - LED drivers and industrial controls