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MOSFET (Si/SiC) Forum Discussions

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What is repetitive avalanche energy and repetitive avalanche current for CoolMOS?
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yiye_4841451
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Moderator 5 replies posted Welcome! First reply posted
Moderator
Repetitive avalanche energy is the maximum permissible reverse-voltage breakdown energy in continuous operation while observing the maximum permissible chip temperature. Repetitive avalanche operation refers to repeated single shot-avalanche events and involves additional parameters such as frequency of the application. IAR, repetitive avalanche current is the maximum allowed peak load current passing through the MOSFET before turn-off at repetitive reverse-voltage breakdown loading. Exceeding IAR (even without exceeding EAR) can lead to destruction of the device due to current oscillations within the MOSFET. IAS (single pulse avalanche current) is not specified in the datasheet because both IAS and IAR are both limited by current oscillations and not by thermal limitation of the device. Hence, the maximum avalanche current is always the same, no matter if in single shot or repetitive operation.

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yiye_4841451
Moderator
Moderator 5 replies posted Welcome! First reply posted
Moderator
Repetitive avalanche energy is the maximum permissible reverse-voltage breakdown energy in continuous operation while observing the maximum permissible chip temperature. Repetitive avalanche operation refers to repeated single shot-avalanche events and involves additional parameters such as frequency of the application. IAR, repetitive avalanche current is the maximum allowed peak load current passing through the MOSFET before turn-off at repetitive reverse-voltage breakdown loading. Exceeding IAR (even without exceeding EAR) can lead to destruction of the device due to current oscillations within the MOSFET. IAS (single pulse avalanche current) is not specified in the datasheet because both IAS and IAR are both limited by current oscillations and not by thermal limitation of the device. Hence, the maximum avalanche current is always the same, no matter if in single shot or repetitive operation.
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