Features

• Primary Side Control for Eliminating Optocoupler

• Built-In 650V Power MOSFET of AP3981D2

• 75mW No-Load Input Power

• Flyback Topology in DCM Operation

• External Adjustable Line Compensation for CC

• Fixed Internal Cable Compensation

• Multiple Segment AM/PFM Control Mode to Improve Audio Noise and Efficiency

• Frequency Jitter to Improve System EMI

• Capacitive Load Start-Up Capability

• Valley-On for the Higher Efficiency and Better EMI Behavior

• Multiple Protections:

• Secondary-Side Overvoltage Protection (SOVP)

• Secondary-Side Undervoltage Protection (SUVP)

• Output Short-Circuit Protection (SCP)

• Transformer Saturation Protection (TSP) via Primary Peak

Current Limitation

• Internal Overtemperature Protection (OTP)

• SO-8 Package

• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

• Halogen and Antimony Free. “Green” Device (Note 3)

Applications

• Routers

• Set-Top Box (STB) Power Supply

• Network Adaptors