PMP7993

LM5017 Flybuck Quad Isolated Output Power Supply without Opto-coupler

PMP7993

Design files

Overview

The LM5017 Flybuck reference design provides multiple isolated outputs to supply the bias voltage needed in a PLC I/O module. It generates 4 isolated outputs: ±15V@50mA and ±5V@100mA; it can cover most of the required voltage rails in the I/O module, such as the OP-AMP, DAC bias, RS-485 transmitter and digital isolator power supplies. In the Flybuck, the regulation is done on the primary side, and thus no opto-coupler is needed. The overall load/line regulation for each output is within +/-5%. The input voltage range is from 17V to 32V.

Features
  • Ideal for PLC I/O modules, or industrial applications requiring multiple bias supplies
  • Quad isolated outputs,  +/-15V@50mA, +/-5V@100mA
  • Designed for an operating range of 17-32V
    • Uses the LM5017 capable of 9 to 100V Input operation for withstanding transients and surge voltage
  • +/-5% Vout regulation accuracy across line and load variations
  • Tested and supported with design files, reference board available upon request

Output voltage options PMP7993.1 PMP7993.2 PMP7993.3 PMP7993.4
Vin (Min) (V) 17 17 17 17
Vin (Max) (V) 32 32 32 32
Vout (Nom) (V) 15 -15 5 -5
Iout (Max) (A) .05 .05 .1 .1
Output Power (W) .75 .75 .5 .5
Isolated/Non-Isolated Isolated Isolated Isolated Isolated
Input Type DC DC DC DC
Topology FlyBuck 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.

SNVU332.PDF (946 K)

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

SNVU334.PDF (946 K)

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

SNVU336.PDF (946 K)

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

SNVR323.PDF (121 K)

Detailed schematic diagram for design layout and components

SNVR324.PDF (24 K)

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

SNVC144A.ZIP (163 K)

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

SNVU333.PDF (205 K)

PCB layer plot file used for generating PCB design layout

SNVU335.PDF (884 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Isolated DC/DC converters & modules

LM50177.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP7993.1 Test Results Sep. 12, 2013
* Test report PMP7993.2 Test Results Sep. 12, 2013
* Test report PMP7993.3 Test Results Sep. 12, 2013
White paper Designing isolated rails on the fly with Fly-Buck™ converters Sep. 29, 2015
More literature Pick the right turns ratio for a Fly-Buck converter (Rev. A) Mar. 13, 2015
More literature Pick the right turns ratio for a Fly-Buck converter Aug. 21, 2014

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