LNK306GN-TL

LinkSwitch™-TN is specifically 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 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
Figure 1. Typical Buck Converter Application (See Application Examples Section
for Other Circuit Configurations).
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. A local supply provided by the IC allows use of a nonsafety graded optocoupler acting as a level shifter to further
enhance line and load regulation performance in buck and
buck-boost converters, if required.


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    SPECIFICATION

    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 simplified 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 filter cost
    • 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 VAC to 265 VAC)
    • 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 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
    • Meets California Energy Commission (CEC), Energy Star, and
    EU requirements