65-W USB Type-C ZVS-flyback reference design


Design files


This reference design is a low-cost, high-density USB adapter that uses the UCC28780 active-clamp flyback controller and UCC5304 isolated driver in a ZVS-flyback topology. The maximum power rating is 65 W at 20-V output but is adjustable for 20-V/15-V/9-V/5-V output voltage and 3 A.  This design reaches a peak efficiency of 93.2%. 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 45 mm by 55 mm by 25mm (62cc).

  • Compact size of 45mm by 55mm by 25mm (62cc)
  • High efficiency, 93.2% peak
  • EMI data provided in test report, below CISPR32 limits
  • Supports variable output voltage 5 V to 20 V
  • Designed to meet efficiency and standby requirements of DoE Level VI and CoC Tier 2
Output voltage options PMP21552.1
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- Synchronous
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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.

TIDT171A.PDF (12255 K)

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

TIDM527A.PDF (303 K)

Detailed schematic diagram for design layout and components

TIDM528A.PDF (344 K)

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

TIDM529A.PDF (318 K)

Detailed overview of design layout for component placement

TIDM531A.ZIP (2006 K)

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


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

TIDM530A.PDF (1362 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
Isolated gate drivers

UCC53045kVrms, 4A/6A single-channel isolated gate driver with 5V UVLO for GaNFETs & MOSFETs

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS7B4250-Q1Automotive 50-mA, off-battery (40-V), adjustable voltage-tracking low-dropout voltage regulator

Data sheet: PDF | HTML
Low-side drivers

UCC275174-A/4-A single-channel gate driver with 5-V UVLO and 13-ns prop delay in SOT-23 package

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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View all 2
Type Title Date
Application note Zero-Voltage-Switching Flyback Using UCC28780 Controller and UCC5304 Isolated Sy Jul. 30, 2020
Test report 65-W USB Type-C ZVS-Flyback Reference Design (Rev. A) Jun. 04, 2020

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