The LNK304PN is a LinkSwitch-TN lowest component count, Energy-efficient Off-line Switcher IC. It is 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. This device integrate 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 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 safely limits output power during fault conditions such as short-circuit or open loop, reducing component count and system-level load protection cost.
● Lowest component count buck converter solution
● Uses a simplified controller without auto-restart
● Tight tolerances and negligible temperature variation
● Supports buck, buck-boost and flyback topologies
● 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 to 265VAC)
● Built-in current limit and hysteretic thermal protection
● Higher efficiency than passive solutions
● Higher power factor than capacitor-fed solutions
● Entirely manufacturable in SMD
