TOP249YN is an offline switcher IC from Power Integrations, belonging to the TOPSwitch-GX family.
It integrates a PWM controller and a high-voltage power MOSFET in one chip, used to build AC-DC switch-mode power supplies (SMPS).

📌 Main Specifications

• Device type: Integrated SMPS controller + MOSFET

• Package: DIP-7 (TOP249YN)

• Input voltage: 85 V – 265 V AC (after rectifier)

• Output power: about 120 W – 150 W depending on design

• Switching frequency: ~132 kHz

• Internal protections: