TIDA-010985

Resistive-bridge insulation monitoring device for 800V DC systems with large Y cap reference design

TIDA-010985

Design files

Overview

This reference design features a resistive-bridge insulation monitoring device (IMD). The design accurately detects symmetrical and asymmetrical isolation resistance faults. The reference design also measures capacitance for high-voltage DC systems with large Y-capacitances (Y caps). The design meets response time requirements per UL standards.

Features
  • Large Y-cap support (up to 9μF total)
  • Low-computation predictive algorithm to shorten response time
  • Low voltage variation on Y caps (±10% with regard to protective earth)
  • Provides both symmetrical and asymmetrical fault detection
  • ±5% resistance and ±15% capacitance measurement errors (±3σ)
  • Supports UL 2231-2 ±15% accuracy and 10s response time
  • Supports up to 1kV bus voltage
  • Isolated Controller Area Network (CAN) 2.0 for communication
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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.

PDF | HTML
TIDUFG5.PDF (1943 KB)

Reference design overview and verified performance test data

SLURB82.PDF (295 KB)

Detailed overview of design layout for component placement

SLURB83.PDF (138 KB)

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

SLURB85.ZIP (3849 KB)

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

SLVC927.ZIP (1181 KB)

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

SLURB84.PDF (1521 KB)

PCB layer plot file used for generating PCB design layout

SLVRBZ5.PDF (526 KB)

Detailed schematic diagram for design layout and components

Products

Includes TI products in the design and potential alternatives.

General-purpose op amps

TLV9002-Q1Automotive-grade, dual, 5.5-V, 1-MHz, RRIO operational amplifier for cost-optimized applications

Data sheet: PDF | HTML
Power modules (integrated inductor)

TPSM33620-Q1Automotive, 3V to 36V input, 2A synchronous buck module

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

TPS7A20300mA ultra-low-noise low-IQ low-dropout (LDO) linear regulator with high PSRR

Data sheet: PDF | HTML
Signal isolators with integrated power

ISOW1044Low emissions, 5-kVrms isolated CAN FD transceiver with integrated DC/DC power

Data sheet: PDF | HTML
Matched thin-film resistors

RES60A-Q1Automotive 1400V matched thin-film resistor divider with 12.5MΩ fixed input

Data sheet: PDF | HTML
TVS diodes

TSM24CA24-V, bidirectional, TVS surge-protection diode

Data sheet: PDF | HTML
Solid-state relays

TPSI2240-Q1Automotive 1200V, 50mA isolated switch with reinforced isolation and avalanche protection

Data sheet: PDF | HTML

Start development

Software

Firmware

MSPM0G3507-IMD-FW — Insulation Monitor Device Firmware for MSPM0G3507 and TIDA-010985

Supported products & hardware

Supported products & hardware

Hardware development
Reference design
TIDA-010985 Resistive-bridge insulation monitoring device for 800V DC systems with large Y cap reference design
Download options

MSPM0G3507-IMD-FW Insulation Monitor Device Firmware for MSPM0G3507 and TIDA-010985

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Latest version
Version: 1.0.0
Release date: Dec 29, 2025
Hardware development
Reference design
TIDA-010985 Resistive-bridge insulation monitoring device for 800V DC systems with large Y cap reference design

Documentation

Release Information

Insulation Monitor Device Firmware for MSPM0G3507 and TIDA-010985

What's new

  • Initial release
  • Insulation Monitor Device Firmware for MSPM0G3507 and TIDA-010985

Technical documentation

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* Design guide Resistive-Bridge Insulation Monitoring Device for 800V DC Systems With Large Y Cap Reference Design PDF | HTML Dec 17, 2025

Related design resources

Hardware development

EVALUATION BOARD
LP-MSPM0G3507 MSPM0G3507 LaunchPad™ development kit for 80-MHz Arm® Cortex®-M0+ MCU

Support & training

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