120VAC Input, 93.2% Efficient 17V 39W Flyback Reference Design


Design files


This reference design is a 120-Vac to 17-V flyback converter with synchronous rectification on the secondary side. The lossless passive clamp on the primary side helps this reference design achieve efficiency over 93% at maximum load.  When combined with PMP20172 this reference design makes a 36W USB Type-C® dual port design to meet your needs.

  • Over 93% efficiency at full load
  • Low standby power, 54 mW with no load
  • 1-oz, 2-layer board measuring 70-mm x 38-mm size
Output voltage options PMP11372.1
Vin (Min) (V) 108
Vin (Max) (V) 132
Vout (Nom) (V) 17
Iout (Max) (A) 2.3
Output Power (W) 39.1
Isolated/Non-Isolated Isolated
Input Type AC
Topology Flyback- Synchronous
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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.

TIDUDN7.PDF (1867 K)

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

TIDRT15.PDF (113 K)

Detailed schematic diagram for design layout and components

TIDRT16.PDF (36 K)

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

TIDRT17.PDF (98 K)

Detailed overview of design layout for component placement

TIDRT19.ZIP (426 K)

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


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

TIDRT18.PDF (570 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)

UCC24636Synchronous rectifier controller With Ultra-Low Standby current

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

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

Data sheet: PDF | HTML

CSD18540Q5B60-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 2.2 mOhm

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP11372 Test Results Oct. 06, 2017

Related design resources

Reference designs

PMP20172 36W USB Dual Port USB Type-C™ PD Reference Design with Port Power Management DC/DC Charger

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