AFE for insulation monitoring in high-voltage EV charging and solar energy reference design


Design files


This reference design features an electric bridge DC insulation monitoring (DC-IM) method which allows an accurate symmetrical and asymmetrical insulation leakage detection mechanism and an isolation resistance detection mechanism. We present a new generation of isolated amplifiers and switchers that enable isolation without an external supply on the hot side. Therefore, the MCU can power the isolation device from the cold side. The insulation monitoring diagnostic can be handled directly by the power conversion or charging protocol MCU.

  • Monitors isolation resistance and insulation leakage from DC to protective earth (PE) at regular intervals
  • Detects insulation fault and symmetrical and asymmetrical warnings
  • Method: switch in resistive divider branch to determine isolation resistance of DC+ or DC– to PE
  • Reinforced insulation analog front end (AFE) for MCUs sitting on the cold side
  • No external supply on hot side
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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


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

TIDMAH1.ZIP (7846 K)

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

TIDCG72.ZIP (558 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.

General-purpose op amps

TLV6001Single, 5.5-V, 1-MHz, RRIO operational amplifier

Data sheet: PDF | HTML
Isolated amplifiers

AMC3330±1-V input, precision voltage sensing reinforced isolated amplifier with integrated DC/DC

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

TPS7A24200-mA, 18-V, ultra-low-IQ, low-dropout (LDO) voltage regulator with enable

Data sheet: PDF | HTML
Series voltage references

REF20333.3-V Vref, low-drift, low-power, dual-output Vref & Vref/2 voltage reference

Data sheet: PDF | HTML
Solid-state relays

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

Data sheet: PDF | HTML

Start development


Support software

TIDA-010232 Software — TIDCG73.ZIP (1321 K)

Technical documentation

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Type Title Date
Design guide AFE for Insulation Monitoring in High-Voltage EV Charging & Solar Energy RefDes (Rev. C) PDF | HTML Jun. 08, 2023
Technical article How to achieve higher-reliability isolation and a smaller solution size with solid-state relays May 09, 2022

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