Isolated Tri-output Fly-Buck Power Supply for Industrial PLC Applications - Reference Design


Design files


The PMP10532 reference design is an isolated Fly-Buck power supply for industrial applications. It takes 24V nominal input and provides three isolated outputs: +5V@1A and +/-15V@200mA. The design is suitable for providing isolated power supply to MCU and control circuits and positive/negative bias to Op Amps in PLC applications. The cross regulation of each output over line and load variation maintains about +/-5% tolerance, and the input voltage range of the supply is from 19V to 30V. The design features the LM5160 synchronous buck converter configured as a Fly-Buck regulator. The LM5160 has a wide Vin range of 4.5V to 65V and 1.5A output current capability with integrated switch FETs. It employs the Constant On-Time (COT) control scheme suitable for the Fly-Buck. With the benefit of primary side regulation, the Fly-Buck converter makes a compact and cost effective solution for multiple isolated output power supply without the opto-coupler feedback.

  • Three isolated outputs, +5V@1A and +/-15V@200mA, are ideal for PLC and industrial applications
  • Fly-Buck converter design, primary side regulation
  • Compact solution for multiple isolated output supplies
  • 19V to 30V input voltage range, +/-5% Vout cross regulation
  • LM5160 sync buck regulator, up to 65V wide Vin range, 1.5A capability
  • Constant On Time control, no loop compensation and fast transient response
  • This circuit board is tested, and the design files and test report are included.
Output voltage options PMP10532.1 PMP10532.2 PMP10532.3
Vin (Min) (V) 19 19 19
Vin (Max) (V) 30 30 30
Vout (Nom) (V) 15 -15 5
Iout (Max) (A) .2 .2 1
Output Power (W) 3 3 5
Isolated/Non-Isolated Isolated Isolated Isolated
Input Type DC DC DC
Topology FlyBuck FlyBuck FlyBuck
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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.

TIDU626.PDF (855 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

TIDC736.ZIP (189 K)

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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Isolated DC/DC converters & modules

LM5160LM5160 wide input 65V, 2A synchronous buck/Fly-Buck™ converter

Data sheet: PDF | HTML
Isolated DC/DC converters & modules

LM5160ALM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Product overview Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications PDF | HTML Nov. 09, 2022
Test report PMP10532 Test Results Oct. 27, 2014

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