Voltage and Current Measurement Reference Design for Automotive On-Board Charger System


Design files


This reference design uses our current shunt amplifiers, operational amplifiers (op amp), ADCs and digital isolators to provide current and voltage measurement for an on-board charger in a hybrid-electric/electric vehicle. The measured current and voltage can be used as control signals for battery-charging optimization. The design is capable of measuring high-side current up to 400-V common-mode voltage while being isolated from the AC portion of the charging circuit to reduce noise.

  • High-side current monitoring up to 400-V common-mode and enables short-to-ground protection
  • Less than 5% current-measurement error for the whole charging current range 1 A to 10 A
  • Less than 10-µS over-current detection
  • Up to 400-V voltage monitoring with less than 5% error
  • Less than 10-µS voltage step detection
  • 2000-V safety isolation
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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.

TIDUBB2.PDF (1583 K)

Reference design overview and verified performance test data

TIDRK40.PDF (162 K)

Detailed schematic diagram for design layout and components

TIDRK41.PDF (217 K)

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

TIDCBQ3.ZIP (2345 K)

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


Includes TI products in the design and potential alternatives.

Analog current-sense amplifiers

INA138-Q1AEC-Q100, 2.7 to 36V, 800kHz Variable gain current sense amplifier

Data sheet: PDF | HTML
Precision ADCs

ADS1115-Q1Automotive 16-bit, 860-SPS, 4-ch, delta-sigma ADC with PGA, oscillator, VREF, comparator and I2C

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

TLC2272A-Q1Automotive Catalog Advanced LinCMOS™ Rail-to-Rail Operational Amplifiers

Data sheet: PDF | HTML

Technical documentation

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View all 2
Type Title Date
Technical article It's in the math: how to convert an ADC code to a voltage (part 2) Apr. 29, 2016
Design guide On-board Charger Load Feedback Sub-system Design Guide Dec. 18, 2015

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