High Light-Load Efficient 120VAC Input, 25W/5VDC Reference Design with 4 POL Outputs


Design files


This 25-W design uses the UCC28740 in a flyback topology to minimize no-load standby power and the UCC24636 synchronous rectifier controller to minimize power MOSFET body-diode conduction times. The design also features point-of-load converters from the main 5V rail that implement an energy-saving Ecomode. All of the devices within the design work together to improve light-load efficiency to help meet agency approvals.

  • 25-W/5-VDC output power rated at 5 A
  • Includes 3.3-V/2-A, 2.5-V/2-A, 1.5-V/3-A, 1-V/5-A outputs
  • Flyback output (5 V) peak efficiency greater than 85%
  • Flyback output dissipates 61 mW at no-load
  • Helps meeting Energy Star requirements
Output voltage options PMP11180.1 PMP11180.2 PMP11180.3 PMP11180.4 PMP11180.5
Vin (Min) (V) 90 4.5 4.5 4.5 4.5
Vin (Max) (V) 132 6 6 6 6
Vout (Nom) (V) 5 3.3 2.5 1.5 1
Iout (Max) (A) 5 2 2 3 5
Output Power (W) 25 6.6 5 4.5 5
Isolated/Non-Isolated Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated
Input Type AC DC DC DC DC
Topology Flyback- Quasi Resonant Buck Buck Buck Buck
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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.

TIDUBF3.PDF (5370 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


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


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28740Constant-Voltage, Constant-Current (CVCC) Flyback controller with Secondary Side Regulation (SSR)

Data sheet: PDF | HTML
Buck converters (integrated switch)

TPS565284.5V to 18V Input, 5-A Synchronous Step-Down Converter with Advanced Eco-mode™

Data sheet: PDF | HTML
N-channel MOSFETs

CSD17559Q530-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 1.5 mOhm

Data sheet: PDF | HTML
SR & load share controllers

UCC24636Synchronous rectifier controller With Ultra-Low Standby current

Data sheet: PDF | HTML
Shunt voltage references

TLVH431A1% low-voltage wide-operating current adjustable precision shunt regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP11180 Test Results Jan. 19, 2016

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