Diodes Incorporated

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AP3783 (Obsolete)

Primary Side Regulated Switching Mode Power Supply Controller

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The AP3783 is a high performance AC/DC power supply controller for battery charger and adapter applications. The controller regulates the output voltage and current in the primary side by piece-wise Pulse Frequency Modulation (p-PFM) in discontinuous conduction mode (DCM).

The AP3783 provides accurate constant voltage (CV), constant current (CC) and outstanding dynamic performance without requiring an opto-coupler. It also eliminates the need of loop compensation circuitry while maintaining stability.

The AP3783 provides valley turn-on function, operating frequency Jitter function (about 5.5% frequency change every 256μs) from light to full load range and 3-segment drive current to improve the power supply EMI performance. The AP3783 also has built-in fixed cable voltage drop compensation (7% and 4% of nominal system output voltage to meet various cables with different length and gauge) and adjustable line voltage compensation.

The AP3783 is packaged in SOT26.


  • Less than 75mW Standby Power Consumption
  • Meet Efficiency Requirement of COC Trier2
  • Valley Turn-on to Reduce Switching Loss and Improve EMI
  • Piece-wise Frequency Reduction to Enhance Conversion Efficiency and Suppress Audio Noise
  • Overvoltage Protection (OVP)
  • Overtemperature Protection (OTP)
  • Short Circuit Protection (SCP) with Hiccup


  • Adapters
  • Chargers
  • LED Lighting
  • Standby and Auxiliary Power Supplies

Product Specifications

Product Parameters

CableCompensation 4% - 7%
OperatingCurrent (µA) 450
StandbyPower (Max) (mW) 75
StartupCurrent (µA) -
UVLOThresholdon/off (V) 15.5/6.8
VCC Maximum Rating 35

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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-2519 2021-05-20 2021-11-20 Device End of Life (EOL)