3.3V Low-Cost Non-Isolated Offline Converter for Smart E-Meters Reference Design


Design files


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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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.

TIDU242.PDF (978 K)

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

TIDC307.ZIP (326 K)

Detailed schematic diagram for design layout and components

TIDR439.PDF (88 K)

Detailed schematic diagram for design layout and components

TIDR440.PDF (68 K)

Detailed schematic diagram for design layout and components

TIDR441.PDF (40 K)

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


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 PMP9310 Test Results Mar. 05, 2014

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