AP3981D2 Series

Primary Side Regulated power switcher

Catalog

Primary Side Regulated power switcher

Part	Package / Case	Package / Case [y]	Package / Case [x]	Mounting Type	Topology	Fault Protection	Voltage - Start Up	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Breakdown	Output Isolation	Supplier Device Package	Power (Watts)	Package / Case [custom]	Package / Case [custom]	Package / Case
Diodes Inc AP3981CS-13	8-SOIC	3.9 mm	0.154 in	Surface Mount	Flyback	Current Limiting Open Loop Over Temperature Over Voltage Short Circuit	16 V	85 °C	-40 °C	650 V	Isolated	8-SO
Diodes Inc AP3981D2S-13	8-SOIC	3.9 mm	0.154 in	Surface Mount	Flyback	Current Limiting Open Loop Over Temperature Over Voltage Short Circuit	16 V	85 °C	-40 °C	650 V	Isolated	8-SO
Diodes Inc AP3981BS7-13	8-SOIC			Surface Mount	Flyback	Current Limiting Open Loop Over Load Over Temperature Over Voltage Short Circuit	16 V	85 °C	-40 °C	650 V	Isolated	7-SO	7.5 W	7	3.9 mm	0.154 in

Catalog

Primary Side Regulated power switcher

Key Features

• Primary-Side Control for Eliminating Opto-Coupler

• Built-In 650V Power MOSFET

• 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 Over Voltage Protection (SOVP)

• Secondary-Side Under Voltage Protection (SUVP)

• Output Short Circuit Protection (SCP)

• Transformer Saturation Protection (TSP) via Primary Peak

• Current Limitation

• Internal Over Temperature Protection (OTP)

• SO-7 Package

• The Recommended Output Power is up to 7.5W

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

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

Description

The AP3981C is a high performance power switchers integrated with a primary side regulation controller and an N-channel power MOSFET. It can be used for battery charger and adaptor applications, accurate Constant Voltage (CV) and Constant Current (CC) can be achieved without an opto-coupler and secondary control circuitry.