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Thread: Short circuit rating

  1. #1
    Beginner Beginner nick is on a distinguished road
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    Short circuit rating

    Hi guys,

    I am looking at the datasheet for IKW40N120T2. Can you please explain how to understand the parameters and conditions of the short circuit rating?

    Thanks in advance,
    nick

  2. #2

    Infineon Employee
    Infineon Employee
    _Klaus is on a distinguished road
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    Jan 2020
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    Hi Nick,

    the data sheet specification

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    basically says that the IGBT survives a low-ohmic short circuit for at least 10µs if all of the following conditions are met
    *) the gate voltage is 15V
    *) the bus voltage is <= 600V
    *) the initial junction temperature is <= 175
    (initial means prior to the SC event)

    Please note that for higher gate voltages or bus voltages the short circuit withstand time reduces.

    "Low ohmic" short circuit means that only the IGBT limits the short circuit current (no other inductance or resistance). Thus, the full bus voltage is on the IGBT while it is conducting the SC current. Since this means a (very) high power dissipation, the duration of the event is limited to 10µs. In this time, the short circuit needs to be detected and turned off in order to avoid a damage to the device.

    More information can be found in this application note (p. 21-23)

    Hope this helps!
    Best regards,
    Klaus
    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

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