65-W USB Type-C™ high density active clamp flyback with GaN reference design


Design files


This reference design is a high density USB adapter that uses the UCC28780 active clamp flyback controller and LMG3411R150 GaN with integrated driver and protection. The maximum power rating is 65W at 20V output but is adjustable for 20V/15V/9V/5V output voltage and 3A.  This design reaches a peak efficiency of 93.7%. The average efficiency and standby power levels are designed to meet DoE level VI and CoC tier 2 limits.  The compact design has dimensions of 2.54” x 1.13” x 0.95” (65mm x 28mm x 25mm).

  • Compact size 2.54” x 1.13” x 0.95” (65mm x 28mm x 25mm)
  • High efficiency, 93.7% peak
  • EMI data provided in test report, below CISPR32 limits
  • Supports variable output voltage 5V to 20V
  • Designed to meet efficiency and standby requirements of DoE Level VI and CoC tier 2
Output voltage options PMP21639.1
Vin (Min) (V) 85
Vin (Max) (V) 265
Vout (Nom) (V) 20
Iout (Max) (A) 3.25
Output Power (W) 65
Isolated/Non-Isolated Isolated
Input Type AC
Topology 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.

TIDT201.PDF (15081 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDM684.PDF (286 K)

Detailed schematic diagram for design layout and components

TIDM685.PDF (343 K)

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

TIDM686.PDF (268 K)

Detailed overview of design layout for component placement

TIDM688.ZIP (2618 K)

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


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

TIDM687.PDF (1231 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC287801-MHz High Frequency Active Clamp Flyback Controller

Data sheet: PDF | HTML
Gallium nitride (GaN) ICs

LMG3411R150600-V 150-mΩ GaN with integrated driver and cycle-by-cycle overcurrent protection

Data sheet: PDF | HTML
Isolated gate drivers

UCC53503kVrms, 5A/5A single-channel isolated gate driver with miller clamp or split out & 8V or 12V UVLO

Data sheet: PDF | HTML
Shunt voltage references

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

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report 65-W USB Type-C™ High-Density Active Clamp Flyback With GaN Reference Design Sep. 04, 2020

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