Automotive shunt-based isolated current sensor reference design for DC/DC and OBC applications
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Key Document


This reference design demonstrates high-side primary current sensing in DC/DC converter and onboard charger (OBC) applications for hybrid and electric vehicles. Using an isolated shunt approach for current sensing has several advantages, including high accuracy, linearity and robustness. However, the large input range of isolated amplifiers causes the shunt to experience high power dissipation. To solve this problem, this reference design utilizes a lower input range isolated amplifier, reducing power dissipation while maintaining the advantages of the shunt-based approach.

  • Lower input range of +/-50 mV facilitates lower power dissipations on the shunt
  • 3-us latency (fast response) with the isolated amplifier
  • High-side current sense circuit with CMTI of 140 kV/μs (typical), 70 kV/μs (minimum)
  • Un-calibrated accuracy of less than 1% across temperature range of -40ºC to 125ºC (AMC output)
  • Interfaces directly with differential- or single-ended ADC

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TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
AMC1302-Q1  Automotive ±50-mV-input, high-precision, reinforced isolated amplifier for current sensing  Isolation  Sample & Buy View Design Kits & Evaluation Modules
LM4132-Q1  Automotive, SOT-23 precision low dropout voltage reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
OPA376-Q1  Automotive Precision, Low Noise, Low Iq Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
SN6501-Q1  Automotive low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies  Power for signal isolators  Sample & Buy View Design Kits & Evaluation Modules
TPS763-Q1  Automotive 150-mA, 10-V, low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
AMC1302-Q1 Download
LM4132-Q1 Download Download
OPA376-Q1 Download Download
SN6501-Q1 Download
TPS763-Q1 Download Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 3031 15 Jan 2019
Design files (6)
Title Type Size (KB) Date
ZIP 698 15 Jan 2019
ZIP 585 15 Jan 2019
PDF 458 15 Jan 2019
PDF 105 15 Jan 2019
PDF 37 15 Jan 2019
PDF 251 15 Jan 2019

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