🔌 What it Is

TOP267VG is an offline AC‑to‑DC switch‑mode power converter IC in the TOPSwitch‑JX family from Power Integrations. It combines a high‑voltage power MOSFET, PWM control, and a suite of protections into one chip, making it ideal for building flyback SMPS (switch‑mode power supplies) with minimal external parts. 

🧠 Key Features & Capabilities

Core Functionality

• Integrated 725 V power MOSFET + PWM controller for flyback converters (isolated output). 

• Designed for off‑line AC mains input (universal 85 VAC – 265 VAC range). 

• EcoSmart™ energy‑efficient operation — low standby consumption (≈ ≤100 mW). 

Control & Efficiency

• Multi‑mode PWM control with options around 66 kHz or 132 kHz to balance efficiency and transformer size. 

• Frequency jittering reduces EMI and can lower filter cost. 

• Soft‑start built‑in to reduce startup stress. 

• Programmable current limit and optimized line feed‑forward for ripple rejection.