30-W/in3, 93.4% efficiency, 100-W AC/DC adapter reference design


Design files


This fully-tested reference design is a high-efficiency, high-power-density, AC/DC adapter solution with a wide input voltage range (100- to 240-V AC) for laptop adapters and smartphone charger applications. This design consists of a front-end transition-mode (TM) power factor correction (PFC) circuit based on the UCC28056, followed by an active-clamp flyback for isolated DC/DC conversion based on the UCC28780.

  • Wide operating input range: 100- to 240-VAC with full power delivery over entire range
  • High efficiency (93.4% peak value) with natural cooling
  • Configured as 5-V/5-A, 9-V/5-A, 15-V/5-A, 20-V/5-A output
  • Low standby power consumption (130 mW)
  • Small size (70 mm × 42 mm × 16.5 mm)
  • High power density (30 W/in3)
Output voltage options TIDA-01623.1
Vin (Min) (V) 100
Vin (Max) (V) 240
Vout (Nom) (V) 20
Iout (Max) (A) 5
Output Power (W) 100
Isolated/Non-Isolated Isolated
Input Type AC
Topology Boost- Transition Mode^Flyback- Active Clamp
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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

TIDRXH4A.ZIP (37944 K)

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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Technical documentation

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Type Title Date
* Design guide 30-W/in^3, 93.4% Efficiency, 100-W AC/DC Adapter Reference Design (Rev. A) Apr. 26, 2019
Technical article Gain ultra-high power density for 100-W USB Power Delivery adapters Mar. 05, 2019
Application note Designing with the ATL431LI Nov. 27, 2018

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