Digital isolator withstands temperatures up to 150°C in HEV/EV systems

March 02, 2020 //By Christoph Hammerschmidt
 Digital isolator withstands temperatures above 125°C in HEC/EV systems
Texas Instruments (TI) has introduced a digital isolator for use in HEV/EV signal communications that is qualified to the Grade 0 ambient operating temperature specification of the Automotive Electronics Council (AEC)-Q100 standard.

The ISO7741E-Q1 isolator features 1.5-kV RMS working voltage and supports temperatures up to the Grade 0 maximum of 150°C. The device enables engineers to better protect low-voltage circuitry from high-voltage events in hybrid electric vehicle (HEV) and electric vehicle (EV) systems and avoid having to design in cooling systems to reduce temperatures to below 125°C – the maximum temperature Grade 1-qualified ICs can support.

Grade 0-qualified ICs meet the requirements of the AEC-Q100’s highest temperature grade (-40°C to 150°C) and are designed to help engineers simplify design of HEV/EV systems in harsh environments, such as 48V HEVs where the co-existence of internal combustion engines and battery systems can heat the air around ICs beyond 125°C. With their operating tamperature range up to 150°C, TI’s new Grade 0 devices, the ISO7741E-Q1 and the TCAN1044EV-Q1, can be placed in high-temperature areas of HEV/EV systems without increasing bill of materials or design complexity.

The ISO7741E-Q1 uses TI’s capacitive isolation technology to provide a working voltage of 1.5 kV RMS and an isolation voltage of 5 kV RMS, enabling engineers to achieve more reliable operation of HEV/EV powertrain and HVAC systems that require signal transmission across an isolation barrier, such as starter generators, cooling fans and traction inverters.

This device provides additional system-level protection in harsh automotive environments due to its high typical common-mode transient immunity of ±100 kV/µs and a ±8-kV International Electrotechnical Commission (IEC) 61000-4-2 contact discharge protection.

More information: www.ti.com/ISO7741E-Q1-pr-eur.

 


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