3W Isolated Triple Output Flyback Converter Reference Design
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Key Document


PMP20852 is an isolated flyback converter reference design with primary-side regulation using the UCC2805 controller IC. There are three independently isolated outputs on the secondary side, each of which use LP2951 linear regulators to provide a well-regulated 16V output on each of the three rails. The design accepts an input voltage of 10Vin to 14Vin (12Vin Nominal) and provides three isolated 16Voutput rails capable of supplying 65mA each of continuous current to the load. The design is built on a 2-layer PCB with 1oz copper on each layer.

  • Independently isolated triple output rails
  • Precision regulated outputs using LDOs
  • Primary-side regulated flyback achieves regulation without the need for an optocoupler

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
Vin (Min) (V)101010
Vin (Max) (V)141414
Vout (Nom) (V)161616
Iout (Max) (A).065.065.065
Output Power (W)
Input TypeDCDCDC
TopologyFlyback- Non SyncFlyback- Non SyncFlyback- Non Sync

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD18543Q3A  60-V, N channel NexFET™ power MOSFET, single SON 3 mm x 3 mm, 9.9 mOhm  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
LP2951  100-mA, 30-V, low-dropout voltage regulator with power good & enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
UCC2805  12V, 1A low power BICMOS 1MHz current mode PWM with 4.1V/3.6V UVLO and 50% duty cycle, -40C to 85C  Offline & isolated DC/DC controllers & converters  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CSD18543Q3A VSONP (DNH)| 8 Download Download
LP2951 Download Download
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Download Download
UCC2805 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 2375 30 Nov 2017
Design files (6)
Title Type Size (KB) Date
ZIP 425 30 Nov 2017
ZIP 569 30 Nov 2017
PDF 658 30 Nov 2017
PDF 143 30 Nov 2017
PDF 33 30 Nov 2017
PDF 199 30 Nov 2017

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