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 UCC28782 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 voltages and 3 A. This design reaches a peak efficiency of 93.4%. 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 44 mm by 54 mm by 20mm (48cc open frame).

  • Compact size of 44 mm by 54mm by 20 mm (48 cc open frame)
  • High efficiency, 93.4% 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 PMP22322.1
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

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.

TIDM875A.PDF (363 K)

Detailed schematic diagram for design layout and components

TIDM876A.PDF (376 K)

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

TIDM877.PDF (286 K)

Detailed overview of design layout for component placement

TIDM878A.ZIP (2131 K)

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

TIDCG10.ZIP (615 K)

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


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28782High-density flyback controller for active-clamp (ACF) and zero-voltage switching (ZVS) topologies

Data sheet document-pdfAcrobat PDF open-in-new HTML
Isolated gate drivers

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

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

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

Data sheet document-pdfAcrobat PDF open-in-new HTML
Shunt voltage references

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

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
User guide 65-W USB Type-C® ZVS-Flyback Reference Design (Rev. A) Jul. 06, 2021

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