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USB-C PD 3.1 EPR Power Delivery Sink - AP33771C

A USB-C PD Sink up to 140 W, 28 V, 5 A based on the Diodes Inc. AP33771C USB PD Controller

magicwolfiMagicWolfi
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This is a USB PD Sink Trigger / Decoy board. USB-C PD offers the option to negotiate power delivery from a compatible power supply. The USB-C PD-Sink plays the role of a sink device, enabling any device to be powered from a USB-PD power supply. Any type of power connector can be attached through a 2-pin screw terminal or directly soldered into the PCB for a lower profile. The voltage can be set to 5 V, 12 V, 20 V, or 28 V (9 V and 15 V with different set resistors) and the current can be set to 1 A, 2 A, 3 A, or 5 A . This board has low Rds_on FETs, which have a Rds_on of only 4.4 mOhm measured. TVS diodes on the input and output for over voltage and surge protection. The board is for sale: https://lectronz.com/products/usb-c-pd-sink-epr

The board is for sale on Lectronz!

All Features:

  • USB-C PD3.1 EPR Power Delivery Sink
  • Selector switch S1 for 5 V, 12 V, 20 V or 28 V (9 V or 15 V with solder mods)
  • Selector switch S2 for 1 A, 2 A, 3 A, or 5 A ( 2.5 A or 4 A with solder mods) for –FA01
  • Max current 5 A
  • Red LED to indicate status as, power on, voltage or current mismatch, abnormal connector impedance, fault conditions
  • Snap off option for mounting tabs
  • For fixed voltage and current, the switch could be replaced by solder jumper
  • Small form factor to be heat shrinked as part of the power cable
  • Size 53 mm x 15 mm (without breakoff tabs, 30 mm wide tabs included)
  • Height 12mm with screw terminal and switch, 6mm without.
  • Lead free assembly

This is a set and forget device. Set your current and voltage needs before plugging the device to your USB-PD source and enjoy the power at the output. This is not a power supply to change voltage and current during operation.

ASSY P42_PD-Sink-EPR_r1.pdf

Assembly drawing with dimensions

Adobe Portable Document Format - 30.97 kB - 06/09/2026 at 00:20

Preview

SCH P42_PD-Sink-EPR_r1.pdf

Schematic rev 1

Adobe Portable Document Format - 198.18 kB - 06/06/2026 at 19:05

Preview

  • 1 × Diodes Inc. AP33771C USB PD 3.1 EPR Controller
  • 2 × ON Semi NTTFS5C453NLTWG FET switches (the part number in the schematic is not correct, but would also be useable)
  • 2 × Nidec Copal CS-7-14 4 pos rotary switch SMD

  • Load Measurements Part 2

    MagicWolfi • 06/18/2026 at 23:12 • 0 comments

    More measurements, this time to find out the real value of Rdson of the 2 power switching FETs ON Semi    NTTFS5C453NLTWG (datasheet link). The datasheet suggest max 3 mOhm @ 10 V and 4.8 mOhm @ 4.5 Vgs. I measured with a constant current of 4.7 A at 28 V and this is the result:

    Vq1q2: voltage across both FETs
    Vload: Voltage at the load

    4.4 mOhm sits very good inbetween the datasheet values. Now I have to measure Vgs to complete this part. 

  • Load Measurements Part 1

    MagicWolfi • 06/06/2026 at 21:09 • 0 comments

    I did some load measurements with a fixed 5.6 Ohm power resistor. Here are the results and some calculations.

    V_J2 : Voltage at output connector on the PCB
    V_R5R6 : Voltage at load resistor
    I_load : current through load resistor (calculated)
    P_load: power dissipation in load resistor (calculated)
    P_supply: power delivery display on supply (ANKER 140W)
    V_q1q2: voltage across the 2 FETs
    Rdson: FET resistance drain-source (calculated)
    P_q: power dissipation in FET switches
    V_5mOhm: Voltage across 5 milliOhm current measurement resistor
    I_in: input current (calculated)

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