3.3V Low-Cost Non-Isolated Offline Converter for Smart E-Meters Reference Design
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The PMP9310 is an offline converter that supplies 3.3VDC output at up to 132mA. It is used for 50Hz single-phase smart e-meters where maximum allowable input apparent power is regulated (typically 4VA) and galvanic isolation is unnecessary. It solves the problem of limited available output power typically seen in a linearly regulated output stage. By employing the wide input LM5017 buck switcher, the capacitor-drop design sets the input of the DC-DC stage at a high value of 72V and extracts significantly more power from the mains at a given input apparent power. The extra available output power supports a system design that incorporates extra functionalities.

  • 85V-230V 50Hz AC input, 3.3V DC output
  • 10mA output at 85V input, and 132mA output at 230V input
  • 1.68VA apparent input power @ 120VAC in and 33mA out
  • 6.6VA input apparent power @ 230VAC in and 132mA out
  • Up to 54% overall power efficiency

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TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5017  7.5-100V Wide Vin, 600mA Constant On-Time Synchronous Buck Regulator  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)
LM5017 Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 913 05 Mar 2014
Design files (4)
Title Type Size (KB) Date
ZIP 326 05 Mar 2014
PDF 40 05 Mar 2014
PDF 68 05 Mar 2014
PDF 88 05 Mar 2014

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