This reference design is a 65W dual-port USB Power Delivery (PD) charger with self-biasing gallium nitride (GaN) flyback. This design can deliver 65W full rated power across 90VAC to 264VAC and meet efficiency standards and regulations such as DoE Level VI and CoC V5 Tier 2 efficiency standards for average efficiency across 25%, 50%, 75%, and 100% while also achieving low standby power consumption. The AC-DC stage flyback converter UCG28826 features VCC self-bias and simplifies the circuity by eliminating auxiliary winding as well as associated VCC rectifier circuity. The DC-DC stage buck converter TPS56837HA switching frequency runs at 500kHz which can minimize the buck stage size further, yielding to 2.3W per cubic centimeters power density.
| Output voltage options | PMP41117.1 | PMP41117.2 | PMP41117.3 | PMP41117.4 |
|---|---|---|---|---|
| Vin (Min) (V) | 90 | 90 | 90 | 90 |
| Vin (Max) (V) | 264 | 264 | 264 | 264 |
| Vout (Nom) (V) | 20 | 15 | 9 | 5 |
| Iout (Max) (A) | 3.25 | 3 | 3 | 3 |
| Output Power (W) | 65 | 45 | 27 | 15 |
| Isolated/Non-Isolated | Isolated | Isolated | Isolated | Isolated |
| Input Type | AC | AC | AC | AC |
| Topology | Flyback- Integrated Switch | Flyback- Integrated Switch | Flyback- Integrated Switch | Flyback- Integrated Switch |
A fully assembled board has been developed for testing and performance validation only, and is not available for sale.
Download ready-to-use system files to speed your design process.
Test results for the reference design, including efficiency graphs, test prerequisites and more
Detailed overview of design layout for component placement
Detailed overview of design layout for component placement
Complete listing of design components, reference designators, and manufacturers/part numbers
Complete listing of design components, reference designators, and manufacturers/part numbers
Files used for 3D models or 2D drawings of IC components
Files used for 3D models or 2D drawings of IC components
Design file that contains information on physical board layer of design PCB
Design file that contains information on physical board layer of design PCB
PCB layer plot file used for generating PCB design layout
PCB layer plot file used for generating PCB design layout
Detailed schematic diagram for design layout and components
Detailed schematic diagram for design layout and components
Includes TI products in the design and potential alternatives.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Test report | 65W Dual-Port USB Power Delivery Charger With Self-Biasing GaN Flyback Converter Reference Design (Rev. A) | PDF | HTML | May 9, 2025 |
| Technical article | How to simplify AC/DC flyback design with a self-biased converter | PDF | HTML | Jul 22, 2025 |
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