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LNK304PN IC – Power Integrations – AC-DC Off Line Switcher IC

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The LNK304PN 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 fly back converters. The fully integrated auto-restart circuit in the LNK304 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.


• Lowest cost and component count buck converter solution

• Fully integrated auto-restart for short-circuit and open loop fault protection – saves external component costs

• 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)


Symbol Parameter Min Type Max Units
VBP BYPASS Pin Voltage 5.55 5.8 6.10 V
VBPH BYPASS Pin Voltage Hysteresis 0.8 0.95 1.2 V
tON(MIN) Minimum On Time 280 360 475 ns
tLEB Leading Edge Blanking Time 170 215 ns
TSD Thermal Shutdown Temperature 135 142 150 °C
TSHD Thermal Shutdown Hysteresis 75 °C

* product image for illustration purposes only. actual product may vary.


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