5.85W Isolated Self-Driven Synchronous Inverting Fly-Buckboost with Optocoupler Reference Design
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Key Document


The PMP30197 reference design is an inverting Fly-BuckBoost power supply using the LM2743 to generate an isolated output voltage of 3.9V. The design accepts an input voltage of 2V to 5.25V.  The converter regulates the secondary side output with an optocoupler and is capable of achieving good output voltage regulation. The synchronous rectifier on the secondary output improves efficiency.

  • Isolated output
  • Optocoupler regulated
  • Synchronous rectifier on the secondary winding improves efficiency
  • Test report available

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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)
Vin (Min) (V)2
Vin (Max) (V)5.25
Vout (Nom) (V)3.9
Iout (Max) (A)1.5
Output Power (W)5.85
Input TypeDC

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM2743  2.2-V to 16-V, voltage mode synchronous buck controller with tracking  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules
LMV431A  1%, low-voltage (1.24-V) adjustable precision shunt regulator  Voltage references  Sample & Buy Not Available
LP2985-N  150-mA, 16-V, low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM2743 Download Download
LMV431A Download Download
Download Download
LP2985-N Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 468 29 Jun 2017
Design files (6)
Title Type Size (KB) Date
ZIP 97 29 Jun 2017
ZIP 451 29 Jun 2017
PDF 222 29 Jun 2017
PDF 199 29 Jun 2017
PDF 105 29 Jun 2017
PDF 186 29 Jun 2017

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