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Primary Side Regulated Switching Mode Power Supply Controller

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The AP3983R is a power switcher for power supplies with better conversion efficiency, better voltage & current accuracy, and improved protection functions. Typical applications include chargers and adapters. The AP3983R with built-in MOSFET, regulates the output voltage and current in the primary side by piecewise Pulse Frequency Modulation (p-PFM) in discontinuous conduction mode (DCM). The system operating frequency reduces linearly from heavy load to light load in each interval of the p-PFM, and enters constant current mode when the load current equals to the maximum system output current.

The AP3983R provides accurate constant voltage (CV), constant current (CC) and outstanding dynamic performance without requiring an opto-coupler. It also eliminates the need for loop compensation circuitry while maintaining stability.

The AP3983R has a built-in fixed cable voltage drop compensation of 8% and adjustable line-voltage compensation.

The AP3983R achieves excellent regulation and high average efficiency, less than 2s startup time for 75mW standby power solution. When the AP3983R is adopted with APR3415, good undershoot performances can be achieved.

The AP3983R is packaged in SO-7.


  • Built-in N Channel MOSFET with 700 BVDSS
  • Less than 75mW Standby Power Consumption
  • Meet Efficiency Requirement of COC Trier 2
  • Valley Turn-On to Reduce Switching Loss and Improve EMI
  • Piecewise Frequency Reduction to Enhance Conversion Efficiency and Suppress Audio Noise
  • Overvoltage Protection (OVP)
  • Overtemperature Protection (OTP)
  • Short Circuit Protection (SCP) with Hiccup
  • Operating Frequency Jitter Function for Conductive EMI Suppression
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device


  • Adapters/Chargers
  • Standby and Auxiliary Power Supplies

Product Specifications

Product Parameters

BVDSS (Min) (V) 700 V
Collector DC Current (A) 5 A
StartupCurrent (µA) 0.6 µA
OperatingCurrent (µA) 650 µA
UVLOThresholdon/off (V) 15.5/6.8 V
Power Rating (W) 10 W
StandbyPower (Max) (mW) 75 mW
CableCompensation 8%

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Orderable Part Number Buy from Distributor / Contact Sales Request Samples


Authorized Distributor Quantity Inventory Date Countries/Regions Buy Online
Mouser Electronics Inc. 5799 9/30/2022 South America, North America, Asia, Europe, Middle East Buy Now
Digi-Key Electronics 70 9/29/2022 Europe, Asia, North America Buy Now
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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2492 2020-11-04 2021-05-04 Device End of Life (EOL)


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