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Datasheet

LNK304 LinkSwitch-TN Buck Converter The Power Integrations LNK304 LinkSwitch?-TN device family are Buck Converter ICs that provide a low component count step down solution. The LNK304 has been designed to offer a higher performing alternative when compared to linear and passive component solutions. Features Fully integrated auto-restart for short circuit and open loop fault protection 66 kHz operation with accurate current limit Tight tolerances and negligible temperature variation High breakdown voltage of 700 V Frequency jittering dramatically reduces EMI (~10 dB) Built-in current limit and hysteretic thermal protection High thermal shutdown temperature (+135 °C minimum) 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

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LNK304PN

LNK304 LinkSwitch-TN Buck Converter The Power Integrations LNK304 LinkSwitch?-TN device family are Buck Converter ICs that provide a low component count step down solution. The LNK304 has been designed to offer a higher performing alternative when compared to linear and passive component solutions. Features Fully integrated auto-restart for short circuit and open loop fault protection 66 kHz operation with accurate current limit Tight tolerances and negligible temperature variation High breakdown voltage of 700 V Frequency jittering dramatically reduces EMI (~10 dB) Built-in current limit and hysteretic thermal protection High thermal shutdown temperature (+135 °C minimum) 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

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1. Description

LinkSwitch-TN is specifi cally 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 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 voltage on the DRAIN pin, eliminating the need for a bias supply and associated circuitry in buck or fl yback 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 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.

 

2.  Features

> Current limit operation rejects line ripple

> Universal input voltage range (85 VAC to 265 VAC)

> Built-in current limit and hysteretic thermal protection

> Higher effi ciency than passive solutions

> Higher power factor than capacitor-fed solutions

> Entirely manufacturable in SMD 


3. Applications

> Appliances and timers

> LED drivers and industrial controls     


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