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FQU30N06L MOSFET problem

Discussion in 'Electronic Design' started by Bru, May 24, 2007.

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  1. Bru

    Bru Guest

    We are using FQU30N06L for a brushless control board, the MOSFETs marked F37
    or F45
    work fine as they have to do at 55 VDC, others marked G21 do not work
    because they start to turn on at 35 VDC. Someone had the same problem?
  2. Marra

    Marra Guest

    I would look for a better MOSFET.

    IRFP9240 work great for me.
  3. Winfield

    Winfield Guest

    Bruno didn't tell us anything about the operating conditions,
    the circuit, or the PCB-layout implementation. All of these
    things are or can be important, depending on the circumstance.
    But I'll make one generalization: Noting the use of FQU30N06L
    parts, the L suffix being the relevant factor, these are the
    low-gate-voltage logic-level version of the part. These have
    an unusually-low gate voltage of 2.2 volts at 1.0 amp (ordinary
    FQU30N06 parts show nearly twice the voltage, 4.3 volts at 1A).
    My point is that low gate-voltage MOSFETs are not well suited
    for many switching applications, especially in a half-bridge
    or H-bridge, because they're much harder to turn off quickly.
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