High Efficiency, High Power Density Active Clamp Flyback Adapter with SJ FET Reference Design


Design files


PMP40328 is a maximum 9V 5A reference design for high frequency and high density adapter applications. The solution implements a high efficiency active clamp flyback  controller UCC28780 and secondary rectifier controller UCC24612-2. The efficiency is around 90% at full load. Integrated input UVLO, and output OVP, OCP,SCP improve the power system reliability. The design is achieved in a compact form factor (52mm X 31mm X 31mm).

  • Zero voltage switching over universal AC input
  • Synchronous rectifier using drain-to-source voltage sensing
  • Integrated input UVLO, output OVP, OCP, SCP
  • Compatible with USB PD PPS protocol from 6.2V5A to 9V5A
  • Size L*W*H 52mm*31mm*31mm
Output voltage options PMP40328.1
Vin (Min) (V) 85
Vin (Max) (V) 265
Vout (Nom) (V) 9
Iout (Max) (A) 5
Output Power (W) 45
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.

TIDUE28.PDF (600 K)

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


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement


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


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

TIDRUX4.PDF (1454 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC controllers (external FET)

UCC24612High-frequency multi-mode synchronous rectifier controller

Data sheet: PDF | HTML
AC/DC & DC/DC controllers (external FET)

UCC287801-MHz High Frequency Active Clamp Flyback Controller

Data sheet: PDF | HTML
Half-bridge drivers

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

Data sheet: PDF | HTML

CSD19532Q5B100-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 4.9 mOhm

Data sheet: PDF | HTML
Shunt voltage references

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

Data sheet: PDF | HTML
Shunt voltage references

TL431Adjustable precision shunt regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP40328 Test Results Dec. 19, 2017
Application note Designing With the Improved TL431LI (Rev. A) Jun. 28, 2019
Application note Designing with the ATL431LI Nov. 27, 2018

Related design resources

Hardware development

UCC28780EVM-002 UCC28780 active clamp flyback 45W AC/DC EVM with GaN FET

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