Automotive High-Voltage and Isolation Leakage Measurements Reference Design


Design files


The function of this reference design is to monitor the isolation resistance of a high-voltage bus to the chassis ground. Monitoring the isolation strength of coupling devices and components from high voltage to the chassis ground is a necessary feature in HEV’s and EV’s as battery management systems, traction inverters, DC/DC converters, onboard chargers, and other subsystems operate at high voltage (greater than 60 V).

  • Accurate isolaton voltage measurement
  • Accurate leakage current estimation
  • Estimated isolation resistance
  • Accurate high-voltage measurement
  • Scalable to multiple batteries
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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.


Reference design overview and verified performance test data

TIDRW46A.PDF (403 K)

Detailed schematic diagram for design layout and components

TIDRW47A.PDF (141 K)

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

TIDRW48A.PDF (229 K)

Detailed overview of design layout for component placement

TIDRW50A.ZIP (2459 K)

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


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

TIDRW49A.PDF (724 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

General-purpose op amps

OPA2348-Q1Automotive-grade, dual, 5.5-V, 1-MHz, low quiescent current (45-μA), RRIO operational amplifier

Data sheet: PDF | HTML
Isolated amplifiers

AMC1301-Q1Automotive Precision ±250mV-Input 3µs-Delay Reinforced Isolated Amplifier

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

TPS763-Q1Automotive 150-mA, 10-V, low-dropout voltage regulator with enable

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

OPA320-Q1Automotive qualified, precision, zero-crossover, 20-MHz, 0.9-pA Ib, RRIO, CMOS operational amplifier

Data sheet: PDF | HTML
Shunt voltage references

TL4050B25-Q12.5-V, 0.2%, 50-ppm/°C automotive precision micropower shunt voltage reference

Data sheet: PDF
Solid-state relays

TPSI2140-Q1Automotive 1200-V 50-mA isolated switch with 2-mA avalanche rating

Data sheet: PDF | HTML
Transformer drivers

SN6501-Q1Automotive low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Automotive High-Voltage and Isolation Leakage Measurements Reference Design (Rev. B) PDF | HTML Jan. 10, 2023
Application brief Addendum to TIDA-01513 For Two-Point Isolation Resistance Measurements PDF | HTML Sep. 10, 2020

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