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TIDA-020069

Automotive high-voltage interlock loop (HVIL) reference design

TIDA-020069

Design files

Overview

This reference design demonstrates how to design a high-voltage interlock loop (HVIL), which operates as the safety circuitry regarding battery connections to high voltages cables in electric vehicles. This design uses a combinations of ampliifers, comparators, LDO, and logic gates to offer both analog and digital readings of the state of the HVIL connector.

Features
  •  Wide coverage of interlock loop fault diagnosis with LED indication         
  •  Configurable constant current generation         
  •  Analog and digital output signal options         
  •  Adjustable thresholds for fault state monitoring         
  •  Unidirectional interlock system     
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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
TIDUF61.PDF (2687 K)

Reference design overview and verified performance test data

TIDMCZ1.PDF (409 K)

Detailed schematic diagram for design layout and components

TIDMCZ2.PDF (339 K)

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

TIDMCZ3.PDF (247 K)

Detailed overview of design layout for component placement

TIDMCZ5.ZIP (1573 K)

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

TIDCGP4.ZIP (572 K)

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

TIDMCZ4.PDF (791 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

AND gates

SN74HCS08-Q1Automotive, 4-ch, 2-input 2-V to 6-V high-speed (12 ns) AND gate with Schmitt trigger inputs

Data sheet: PDF | HTML
Comparators

TLV9034-Q1Automotive, 5.5-V, low-voltage, high-performance quad push-pull comparator with 120-ns delay

Data sheet: PDF | HTML
General-purpose op amps

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

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

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

Data sheet: PDF | HTML
XOR (exclusive OR) gates

SN74HCS86-Q1Automotive 4-ch, 2-input, 2-V to 6-V low power XOR (exclusive OR) gates with Schmitt-Trigger inputs

Data sheet: PDF

Technical documentation

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Type Title Date
Design guide Automotive High-Voltage Interlock Loop (HVIL) Reference Design PDF | HTML May 23, 2024

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