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Desaturation Fault Detection: Optocoupler Gate Drive Products with Feature: ACPL 333J, ACPL 330J, ACPL 332J, ACPL 331J and HCPL 316J

Authored on: Jan 12, 2012 by C. J. Foo

Technical Paper

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A desaturation fault detection circuit provides protection for power semiconductor switches (IGBT or MOSFETs) against short-circuit current events which may lead to destruction of these power switches. This desaturation of the inverters can also occur due to an insufficient gate drive signal caused by inverter gate driver mis-performance or by driver supply voltage issues. To prevent catastrophic damage to the drive, desaturation fault detection and protection must be implemented to reduce or turn-off the overcurrent during the fault condition. This application note covers the design of the desaturation fault detection feature in Avago intelligent gate drivers. How does the desaturation fault detection feature work in Avago drivers?

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