Description

LNK306PN POWER INTEGRATIONS The LNK306PN is a LinkSwitch-TN lowest component count, energy-efficient off-line Switcher, 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. LinkSwitch-TN devices 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 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. Lowest Component Count Buck Converter Solution Fully integrated Auto-restart for Short-circuit and open loop fault protection saves component costs 66kHz Operation with accurate current limit, allows low cost Off-the-shelf 1mH Inductor Tight Tolerances and Negligible Temperature Variation High Breakdown Voltage of 700V Provides Excellent Input Surge Withstand Frequency Jittering Dramatically Reduces EMI (~10dB) 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 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 EcoSmart™ - Extremely Energy Efficient Consumes typically 50/80mW in self-powered buck topology at 115/230VAC input with no-load Applications Consumer Electronics, Clock & Timing, LED Lighting, Industrial, Automation & Process Control