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Why can an ASIL-B driver be used for an ASIL-C/D system? (KA-03360)

Why can an ASIL-B driver be used for an ASIL-C/D system? (KA-03360)

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Why can an ASIL-B driver be used for an ASIL-C/D system? (KA-03360)

Community Translation: なぜASIL-C/DシステムにASIL-Bドライバを使用できるのか?(KA-03360) 

ASIL C/D decomposition of half bridge on system level:

Each error on device level leading to a safety requirement violation on system level (wrong torque) is covered by the device itself through the device's ASIL-B safety requirements. Additionally, each error on the device level is covered again by:

  • Complementary ASIL-B driver via DESAT/OCP (for errors leading to short-circuit events in the half bridge)
  • External phase current plausibility check over the MCU
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