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-48V Telecom Current/Voltage/Power Sensing with Isolation

TIDA-00313

Overview

This proven design accurately measures current, voltage, and power on a bus carrying -48V and provides the data using an I²C-compatible interface. This design is suitable for telecom applications since most common telecom equipment is powered by this negative supply voltage. It uses INA226 and ISO1541. The INA226 is a current shunt/power monitor with an I²C compatible interface. The device will accurately process these measurements and convert the negative voltage to a ground reference signal using ISO1541. The ISO1541 is a low power bidirectional I²C compatible isolator.

characteristic

● Reports current, voltage and power on buses carrying -48V
● High precision:

- 10µV offset (max)

- 0.1% gain error (maximum)

● I²C compatible interface
● Supports isolated board-to-board communication
● I²C compatible isolator converts -48V reference to ground reference signal

Backlog Impt notice changes Backlog Impt notice changes end

Blockdiagram

Design Files

Documentation

-48V Isolated Telecom Current, Voltage and Power Sense Reference Design (Rev. A)

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Update:2025-07-02 06:23:15

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