LNK305PN — Power Integrations LinkSwitch‑TN Series Offline Power Switch IC

The LNK305PN is an integrated offline AC‑to‑DC switch‑mode power supply controller from the LinkSwitch‑TN family by Power Integrations. It’s designed to replace traditional linear or capacitor‑dropper power supplies with a much more efficient switch‑mode solution that’s simple to build and requires very few external components. 

📌 Key Features

• Type: Offline AC‑DC switcher / SMPS controller IC (non‑isolated) 

• Series: LinkSwitch‑TN 

• Package: Through‑hole DIP‑8 

• Input Voltage Range: 85 VAC to 265 VAC (universal mains) 

• Topology Support: Buck, Buck‑Boost, and Flyback converter configurations 

• Switching Frequency: ~66 kHz 

• Internal Power MOSFET: ~700 V breakdown voltage 

• Operating Temperature Range: approx. −40 °C to +150 °C (junction) 

• Power Output Range: Typically suitable for low‑power supplies (hundreds of mA)