TIDA-01445

Automotive High-Voltage Interlock Reference Design

TIDA-01445

Design files

Overview

This reference design is a low BOM design that has good coverage of automotive interlock connection diagnosis. In hybrid or electric vehicles (HEV/EVs), battery management systems, traction inverters, DCDC converters, onboard chargers, and other subsystems that operate at high voltages need to have interlock. Interlock is a current and voltage loop mechanism used to detect tampering or opening of the high-voltage equipment or service disconnect switch.This design covers generating and monitoring mechanism of high voltage interlock system.

Features
  • Unidirectional interlock system
  • Tristate operation with unidirectional system
  • Wide coverage of interlock loop fault diagnosis
  • >97% accurate low-side current sense at >5mA
  • Protection for automotive output line faults

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.

TIDUD43A.PDF (3887 K)

Reference design overview and verified performance test data

TIDRSO9.PDF (260 K)

Detailed schematic diagram for design layout and components

TIDRSP0.PDF (62 K)

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

TIDRSP1.PDF (178 K)

Detailed overview of design layout for component placement

TIDRSP3.ZIP (618 K)

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

TIDCDU3.ZIP (394 K)

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

TIDRSP2.PDF (545 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Comparators

LM2903-Q1AEC-Q100, Grade 0 and 1, Automotive High Voltage Dual Differential Comparator

Data sheet document-pdfAcrobat PDF open-in-new HTML
Current sense amplifiers analog output

INA225-Q1AEC-Q100, 36V, bi-directional current sense amplifier w/ four pin-selectable gain settings

Data sheet document-pdfAcrobat PDF
High-side switches

TPS2H000-Q140-V, 1-Ω, 2-ch automotive smart high-side switch with adjustable current limit

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS7A16-Q1Automotive 100-mA, 60-V, ultra-low-IQ, low-dropout voltage regulator with power good and enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS7B69-Q1Automotive 150-mA, off-battery (40-V), high-PSRR, low-IQ, low-dropout voltage regulator

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

star
= Top documentation selected by TI
No results found. Please clear your search and try again.
View all 1
Type Title Date
* Design guide Automotive High-Voltage Interlock Monitoring Reference Design (Rev. A) Apr. 16, 2018

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​

Videos