30-W/in3, 94% Efficiency, 65-W USB Type-C PD AC/DC adapter reference design


Design files


This fully tested, USB power delivery reference design is a high efficiency, high power density, AC/DC adapter solution with a wide input voltage range (85 - 265VAC) for laptop adapters and smartphone charger applications. It adopts active-clamp-flyback topology controlled by TI’s newest ACF controller UCC28780 as the mainly power supply stage. This design uses TPS25740B, TI’s PD source controller, to achieve a full PD 2.0 function. The design achieves a peak efficiency of 94% at a very high switching frequency. The design’s power density is increased to 30 W/in3, which is much higher than traditional solutions.

  • High efficiency (94% peak value)
  • High power density (30W/in³)
  • Low no load power consumption (60mW)
  • Low light load input power (0.5W), @20Vout/0.25W output
  • Fully compatible with USB PD 2.0 standard, with 5V/3A, 9V/3A, 15V/3A, 20V/3.25A output
  • Active-clamp flyback + SR topology
  • Small size (62mm*28.6mm*18.4mm)

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.


Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement


Files used for 3D models or 2D drawings of IC components


Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Flyback controllers

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N-channel MOSFETs

CSD17578Q3A30-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 9.4 mOhm

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SR & load share controllers

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Shunt voltage references

ATL4312.5-V low-IQ adjustable precision shunt regulator

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USB Type-C & USB Power Delivery ICs

TPS25740BUSB Type-C™ and USB PD Source Controller

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide 30-W/in^3, 94% Efficiency, 65-W USB Type-C™ PD AC/DC Adapter Reference Design (Rev. C) PDF | HTML Jun. 18, 2020
Application note Designing with the ATL431LI Nov. 27, 2018
Technical article TI empowers design engineers at APEC Feb. 16, 2018

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