PMP21479

65W Active clamp flyback with Si FETs reference design for a high power density 5-20V AC/DC adapter

PMP21479

Design files

Overview

This reference design uses the UCC28780 active clamp flyback controller to generate a 20-V/15-V/9-V/5-V adjustable output voltage. The maximum power rating is 65 W at 20-V output and up to 3 A at all other output voltage settings. This design reaches a peak efficiency of over 93% using silicon FETs, due to zero voltage switching (ZVS) and recaputuring the leakage energy.  The high efficiency enables a small form factor and a high power density.

Features
  • Zero voltage switching (ZVS) provides high efficiency (93.5% peak value)
  • Low, no load power consumption (33 mW)
  • Supports outputs of 5V/3A, 9V/3A, 15V/3A, and 20V/3.25A
  • Conducted emissions (EMI) data provided in test report
  • Small size (48mm x 48mm x 25mm) provides high power density (18W/in^3)
Output voltage options PMP21479.1
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

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.

TIDT096A.PDF (12796 K)

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

TIDRZA9A.PDF (286 K)

Detailed schematic diagram for design layout and components

TIDRZB0A.PDF (343 K)

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

TIDRZB1A.PDF (291 K)

Detailed overview of design layout for component placement

TIDM574.ZIP (1548 K)

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

TIDCFU4.ZIP (1044 K)

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

TIDRZB2A.PDF (1267 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Flyback controllers

UCC287801-MHz High Frequency Active Clamp Flyback Controller

Data sheet document-pdfAcrobat PDF open-in-new HTML
Half-bridge drivers

UCC277121.8-A/2.8-A, 620V half bridge driver with interlock

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
N-channel MOSFETs

CSD17575Q330-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 3.2 mOhm

Data sheet document-pdfAcrobat PDF open-in-new HTML
SR & load share controllers

UCC24612High-frequency multi-mode synchronous rectifier controller

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

star
= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 2
Type Title Date
* Test report 65W Active Clamp Flyback With Si FETs Reference Design for a High Power Density (Rev. A) Apr. 29, 2020
Application note Zero-Voltage-Switching Flyback Using UCC28780 Controller and UCC5304 Isolated Sy Jul. 30, 2020

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​

Videos