Wide Input Range (140Vac to 440Vac) Non Isolated Off-line Flyback Converter with Multiple Outputs
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An energy metering device very often needs non-isolated power, since the neutral is connected to the ground of the output. This is a typical application, when 1.8V, 3.3V, 12V and 18V are needed to supply digital and analog loads. Even though a small transformer is employed, the PSU delivers 9Wpeak power.

  • Wide input voltage range (line-neutral and line-line)
  • Covers single phase and three phase applications
  • Small EP7 transformer
  • Uses high electrolytic capacitance value for 500msec hold-up time

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Schematic/Block Diagram

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Design Files

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(Output Voltage 1)
(Output Voltage 2)
(Output Voltage 3)
(Output Voltage 4)
Vin (Min) (V)1403.53.5140
Vin (Max) (V)4404.54.5440
Vout (Nom) (V)183.31.812
Iout (Max) (A).
Output Power (W)2.88.495.1447.2
TopologyFlyback- DCMLinear RegulatorLinear RegulatorFlyback- DCM

TI Devices (3)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TLV700-Q1  Automotive 200-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable  Power management  Sample & Buy Not Available
TLV70018-Q1  Automotive 300-mA, high-PSRR, low-IQ, low-dropout voltage regulator with enable for 1.8 V  Power management  Sample & Buy Not Available
UCC28722  Low-Cost CVCC Flyback controller With primary-side regulation for bipolar Power Device  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
TLV700-Q1 Download
TLV70018-Q1 Download -
UCC28722 Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 611 10 Apr 2015
Design files (4)
Title Type Size (KB) Date
ZIP 351 10 Apr 2015
PDF 490 10 Apr 2015
PDF 24 10 Apr 2015
PDF 181 10 Apr 2015

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