Power IntegrationsLNK 364PN

The Power Integrations LNK364PN is a LinkSwitch-XT AC/DC off-line switcher IC with an integrated 700V power MOSFET, ON/OFF control and a typical switching frequency of 132kHz. It is intended for low-power mains-operated flyback supplies with very low external component count.

Technical description

The LNK364PN integrates the high-voltage power MOSFET, oscillator, ON/OFF control, high-voltage switched current source, cycle-by-cycle current limit, frequency jitter, leading-edge blanking, auto-restart and hysteretic thermal shutdown. The family is intended for universal-input 85-265VAC applications. Switching frequency is 124-140kHz with 132kHz typical and approximately 9kHz peak-to-peak jitter for EMI reduction.

Power capability depends on the application conditions defined by Power Integrations: at 230VAC ±15% up to 5.5W in an enclosed adapter and 9W open-frame; at 85-265VAC universal input up to 4W in an adapter and 6W open-frame. These values are design-condition ratings rather than a single fixed IC power rating.

LNK364 current limit is 233-268mA with 250mA typical under the datasheet test conditions. DRAIN breakdown voltage is 700V. Thermal shutdown is typically 142C with approximately 75C hysteresis. Internal MOSFET maximum RDS(on) is 28 Ohm at 25C and 45 Ohm at 100C under the specified test conditions.

Typical applications

Low-power power supplies, chargers, adapters, appliances, industrial electronics, metering, standby supplies and general mains-powered flyback converters.

Compatibility note

Replacement must not be based on part-number similarity alone. Verify control family, current limit, power capability for the exact topology, MOSFET voltage, pinout, package and transformer/clamp design requirements. The official package designation is P package PDIP-8B, while it is commonly sold as DIP-7.

Frequently asked questions

What is the integrated MOSFET voltage rating?
700V.

What is the typical switching frequency?
132kHz, with a 124-140kHz range and frequency jitter.

What is the maximum output power?
It depends on input and construction: up to 9W open-frame at 230VAC ±15% and up to 6W open-frame at 85-265VAC.

Does it include short-circuit protection?
Yes. Auto-restart protection is provided for overload, short-circuit and open-loop faults.