200V to 400V Input (Nominal), Triple-Output Bias Supply with Input Voltage Sensing Reference Design


Design files


This reference design is a compact and thermally efficient design intended to be used as a bias supply for half-bridge converters. A DCM Flyback with UCC3813-4 controller is used to generate two isolated 12V supplies for half-bridge converter primary driving circuitry. One 5V is generated at the secondary side for secondary rectifier driving circuitry and controller. The second winding at secondary side can be used to sense input voltage level while the Flyback converter is operating.

  • 200VDC to 400VDC input, two isolated 12V output at primary side and one 5V output at secondary side
  • Less than 30 degree C temperature rise on all parts
  • Input voltage sensing circuit included
  • 1" x 1.5" x 0.5" board dimension
  • Test report available
Output voltage options PMP20306.1 PMP20306.2 PMP20306.3
Vin (Min) (V) 200 200 5.5
Vin (Max) (V) 400 400 8
Vout (Nom) (V) 12 6 5
Iout (Max) (A) .2 .1 .1
Output Power (W) 2.4 .6 .5
Isolated/Non-Isolated Isolated Isolated Non-Isolated
Input Type DC DC DC
Topology Flyback- DCM Flyback- DCM Buck- 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.

TIDUD85.PDF (1239 K)

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

TIDRR36.PDF (117 K)

Detailed schematic diagram for design layout and components

TIDRR37.PDF (33 K)

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

TIDRR38.PDF (101 K)

Detailed overview of design layout for component placement

TIDRR40.ZIP (518 K)

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

TIDCDH0.ZIP (1535 K)

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

TIDRR39.PDF (417 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)

UCC3813-4Economy low power BICMOS 1MHz current mode PWM with 12.5V/8.3V UVLO, 50% duty cycle, 0C to 70C

Data sheet: PDF | HTML
AC/DC & DC/DC converters (integrated FET)

TPS621633V-17V 1A Step-Down Converters with DCS-Control™

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP20306 Test Results May 30, 2017

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