Automotive High-Voltage Interlock Reference Design

(ACTIVE) TIDA-01445

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Key Document

Description

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

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Schematic/Block Diagram

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Design Guide

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Design Files

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Bill of Materials (BOM)

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TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
INA225-Q1  AEC-Q100, 36-V Programmable Gain, Bi-Directional, High-Speed Voltage Out CSA  Current sense amplifiers  Sample & Buy View Design Kits & Evaluation Modules
LM2903-Q1  AEC-Q100, Grade 0 and 1, Automotive High Voltage Dual Differential Comparator  Amplifiers  Sample & Buy Not Available
TPS2H000-Q1  40-V/1000-mΩ Dual Channels Smart High-Side Switch  Power switches  Sample & Buy View Design Kits & Evaluation Modules
TPS7A16-Q1  Automotive 60V, 5μA Iq, 100mA Low-Dropout (LDO) Voltage Regulator With Enable and Power Good  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7B69-Q1  Automotive High-Voltage Ultra-Low-Iq Low-Dropout Regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
INA225-Q1 Download Download
LM2903-Q1 Download -
Download
Download Download
TPS2H000-Q1 Download Download
TPS7A16-Q1 Download
TPS7B69-Q1 Download
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Technical Documents

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User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 3887 16 Apr 2018 14
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 394 19 Sep 2017 2
ZIP 618 19 Sep 2017 7
PDF 545 19 Sep 2017 2
PDF 178 19 Sep 2017 2
PDF 62 19 Sep 2017 5
PDF 260 19 Sep 2017 19

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