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LNK302/304-306

LinkSwitch-TN Family

Lowest Component Count, Energy-Effi cient

Off-Line Switcher IC

Figure 1. Typical Buck Converter Application (See Application

Examples Section for Other Circuit Confi gurations).

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 – saves external component costs

• LNK302 uses a simplifi ed 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 fi lter cost

• High thermal shutdown temperature (+135 °C minimum)

Much Higher Performance over Discrete Buck and

Passive Solutions

• Supports buck, buck-boost and fl yback topologies

• System level thermal overload, output short-circuit and

open control loop protection

• Excellent line and load regulation even with typical

confi guration

• 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 effi ciency than passive solutions

• Higher power factor than capacitor-fed solutions

• Entirely manufacturable in SMD

EcoSmart®– Extremely Energy Effi cient

• 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 fl yback topology

with external bias at 115/230 VAC input with no load

• Meets California Energy Commission (CEC), Energy

Star, and EU requirements

Applications

• Appliances and timers

• LED drivers and industrial controls

Description

LinkSwitch-TN is specifi cally 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 effi ciency.

®

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.