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Home/Mosfet Selection

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Anonymous
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Anonymous
Asked: May 27, 2022In: Power Management

Mosfet Selection

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What parameters need to check for the selection of Power MOSFET in the Power supply?

What parameters need to check for the selection of Power MOSFET in the Power supply?

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Mosfet Selectionpower mosfetpower-supplysemiconductor
  1. Mahendra Metil
    Added an answer on June 3, 2022 at 10:45 am

    RDS(ON) parameters RDS(ON) means “resistance between drain and source in conduction.” MOSFETs are generally used as a better alternative to power transistors and are used for high-current–switching applications. If this parameter is lower, it means that the MOSFET loses less energy, according to OhmRead more

    RDS(ON) parameters
    RDS(ON) means “resistance between drain and source in conduction.” MOSFETs are generally used as a better alternative to power transistors and are used for high-current–switching applications. If this parameter is lower, it means that the MOSFET loses less energy, according to Ohm’s law, and results in higher energy efficiency and produces less heat. The designer should choose a component model with the lowest possible RDS(ON) value. when the MOSFET is conducted, the RDS(ON) can be calculated with the formula: RDS(ON) = V(DS) / I(D)

    Input (Ciss) and output (Coss) capacitance parameters
    The “gate,” the oxide layer, and the relative connection on the MOSFET body works, in effect, like a small capacitor. As soon as the “gate” is subjected to a voltage, this virtual capacitor begins to charge. Charging takes time, and therefore, there is a delay in the on state. The designer should choose a MOSFET with the lowest possible input capacitance to avoid long delays. If using a MOSFET with a direct connection to an MCU output pin, the “gate” should be connected via an external resistor to prevent unwanted results. Regarding the SiC model used, its capacitive parameters are as follows:
    Input capacitance (Ciss): At VDS = 100 V, VGS = 0 V, F = 100 kHz — 1,500 pF
    Output capacitance (Ciss): At VDS = 100 V, VGS = 0 V, F = 100 kHz — 104 pF

    Parameters related to switching speed
    MOSFETs are particularly suitable for fast-switching applications. The higher the frequency, the smaller the transformers must be, but the transmitted noise increases. In parameters that link the component to the switching speed are as follows:

    Turn-on delay time (tdon): 25 ns
    Rise time (tr): 14 ns
    Turn-off delay time (tdoff): 54 ns
    Fall time (tf): 11 ns

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