Wide Input Range (140Vac to 440Vac) Non Isolated Off-line Flyback Converter with Multiple Outputs


Design files


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
Output voltage options PMP10055.1 PMP10055.2 PMP10055.3 PMP10055.4
Vin (Min) (V) 140 3.5 3.5 140
Vin (Max) (V) 440 4.5 4.5 440
Vout (Nom) (V) 18 3.3 1.8 12
Iout (Max) (A) .16 .15 .08 .6
Output Power (W) 2.88 .495 .144 7.2
Isolated/Non-Isolated Non-Isolated Non-Isolated Non-Isolated Non-Isolated
Input Type AC DC DC AC
Topology Flyback- DCM Linear Regulator Linear Regulator Flyback- DCM
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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

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TIDU903.PDF (636 K)

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Technical documentation

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Type Title Date
Test report PMP10055 Test Results Apr. 10, 2015

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