TOP250YN is an offline switcher IC from Power Integrations, part of the TOPSwitch-GX family.
It is used in switch-mode power supplies (SMPS) to convert high-voltage AC mains into regulated DC output.

This IC integrates a PWM controller + high-voltage MOSFET in a single chip, simplifying SMPS design.

📌 Key Specifications

• Device Type: Integrated offline switcher (SMPS controller + MOSFET)

• Package: DIP-7 (TOP250YN)

• Input: 85 V – 265 V AC (after rectification)

• Output Power:

  • up to ~150 W (depending on design and cooling)

• Switching Frequency: ~132 kHz typical

• Built-in Protections: