600V Uni-directional Current/Voltage/Power Monitoring for Solar Smart Combiner Box Reference Design
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Key Document


The TIDA-00639 reference design is a non-isolated high-side current and voltage sensing design for a smart combiner box in a grounded or ungrounded system.  The non-isolated current sensing topology enables accurate power monitoring for high voltage systems.  This design is optimized for any voltage between 95 V and 600 V, and with minor component changes this sensing topology can be optimized for any voltage from 40 to 1000V.

  • Non-isolated high-side current and voltage monitoring of 1-4 photovoltaic (PV) strings
  • Capable of monitoring voltage within ±1 % full scale accuracy
  • Capable of uncalibrated current monitoring within ±1.25 % full scale accuracy and capable of calibrated current monitoring within ±0.75 % full scale accuracy
  • Integrates with RS-485 communication board
  • Option to connect four TIDA-00639 boards to one microcontroller

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Schematic/Block Diagram

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Design Guide

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Design Files

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TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
INA226  36V, 16-bit, ultra-precise i2c output current/voltage/power monitor w/alert  Current sense amplifiers  Sample & Buy View Design Kits & Evaluation Modules
LMT84  1.5V-Capable, 10 uA Analog Output Temperature Sensor in SC70 and TO-92  Temperature sensors  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
INA226 Download Download
LMT84 Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1300 11 Oct 2016
Design files (6)
Title Type Size (KB) Date
ZIP 1229 21 Oct 2016
ZIP 1073 21 Oct 2016
PDF 3377 21 Oct 2016
PDF 2153 21 Oct 2016
PDF 62 21 Oct 2016
PDF 1292 21 Oct 2016

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