LNK305DN Datasheet PDF - Power Integrations

●The LNK305DN is a lowest component count energy-efficient offline Switcher IC specifically designed to replace all linear and capacitor-fed (cap dropper) non-isolated power supplies in the under 360mA output current range at equal system cost while offering much higher performance and energy efficiency. It integrates a 700V 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 fully integrated auto-restart circuit in the LNK305 safely limits output power during fault conditions such as short-circuit or open loop, reducing component count and system-level load protection. A local supply provided by the IC allows use of a non-safety graded optocoupler acting as a level shifter to further enhance line and load regulation performance in buck and buck-boost converters, if required.

● Tight tolerances and negligible temperature variation

● High breakdown voltage of 700V provides excellent input surge withstand

● Frequency jittering dramatically reduces EMI

● High thermal shutdown temperature

● 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

● Built-in current limit and hysteretic thermal protection

● Higher efficiency than passive solutions

● Higher power factor than capacitor-fed solutions

● Entirely manufacturable in SMD

● Consumes typically 7/12mW in fly-back topology with external bias at 115/230VAC input with no-load