Reference Design for 1200V Isolated I2C High Side Current Sensing for Solar Combiner Boxes


Design files


This reference design is an isolated high-side current sensing design for a smart combiner box in a grounded or ungrounded system. The current sensing topology enables multichannel, sub ±1% error, isolated current sensing for high-voltage systems up to 1200-VDC, limited by the DC/DC transformer.

  • Isolated high-side current sensing of multiple photovoltaic strings
  • Capable of monitoring current within 1% full scale accuracy
  • Support 1200V isolated current sensing via I2C in smart combiner boxes
  • Option to connect additional INA260 devices to I2C bus
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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.

TIDUDM5.PDF (2210 K)

Reference design overview and verified performance test data

TIDUBU9.PDF (1300 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRTO5.ZIP (1101 K)

Files used for 3D models or 2D drawings of IC components

TIDCE17.ZIP (302 K)

Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Digital isolators

ISO7842Highest isolation rating, quad-channel, 2/2, reinforced digital isolator

Data sheet: PDF | HTML
Digital power monitors with integrated shunt resistor

INA26036V, 16-bit, precision i2c output current/voltage/power monitor w/ int. shunt resistor

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

TPS709150-mA, 30-V, ultra-low-IQ, low-dropout voltage regulator with reverse current protection and enable

Data sheet: PDF | HTML
Transformer drivers

SN6505ALow-noise, 1-A, 160-kHz transformer driver with soft start for isolated power supplies

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Reference Design for 1200-V, Isolated, I2C, High-Side Current Sensing Nov. 20, 2017
Design guide 600-V Unidirectional Curr/Volt/Power Monitoring for Solar Smart Combiner Box Oct. 11, 2016

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