PMP9311

Cap-Drop Offline Power Supply for Standard-Compliant Feature-Rich E-Meters Reference Design

PMP9311

Design files

Overview

The PMP9311 is a low power capacitor-drop type of offline converter that takes a 50Hz AC input of 85V to 230V and puts out a regulated DC 3.3V at up to 85mA. It is used for electronic electricity meters where apparent power consumption is regulated and galvanic isolation is not required. The high output current capability for the same input apparent power limit supports a feature-rich electricity meter design. The increased output power is achieved by allowing the clamped zener voltage to be as high as 42V, and the employment of a wide input range buck switching regulator.

Features
  • 85V-230V 50Hz AC input, 3.3V DC output
  • 15mA output at 85V input, and 85mA output at 230V input
  • 1.83VA input apparent power @ 120VAC in and 29mA out
  • 6.78VA input apparent power @ 230VAC in and 85mA out
  • Up to 50% overall power efficiency

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.

TIDU238.PDF (744 K)

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

TIDC294.ZIP (336 K)

Detailed schematic diagram for design layout and components

TIDR419.PDF (82 K)

Detailed schematic diagram for design layout and components

TIDR421.PDF (59 K)

Detailed schematic diagram for design layout and components

TIDR420.PDF (34 K)

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

Products

Includes TI products in the design and potential alternatives.

Buck converters (integrated switch)

LM2842SIMPLE SWITCHER® 4.5V to 42V, 0.6A Step-Down DC/DC Switching Regulator in Thin SOT-23

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
Technical article Power Tips: Powering the IoT in Our Homes Jun. 11, 2014
Test report PMP9311 Test Results Feb. 27, 2014

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