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Mosfet selection for switching a solenoid

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Discussion in 'General Electronics Discussion' started by abuhafss, Jan 19, 2015.

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  1. Jan 19, 2015 #1
    abuhafss

    abuhafss

    348
    11
    Aug 3, 2010
    Hi

    I need help for the selection of suitable mosfet (TO-220 package) for switching a solenoid with following parameters:

    Switching Frequency = 16 Hz
    On time = 20ms
    Off time = 41ms
    Duty Cycle = 32.78%
    Operating Voltage = 12V (for driver and solenoid)
    Solenoid Inductance = 1.2mH
    Current = 2.6 - 3.0A

    Also the value of the gate resistor for the mosfet.
     
    Last edited: Jan 19, 2015
  2. Jan 19, 2015 #2
    KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,268
    Nov 28, 2011
    Do you want an N-channel or P-channel MOSFET?

    What supplier?

    There's a very wide range of MOSFETs that will be suitable.

    Here's a list of suitable N-channel devices from Digi-Key in order of ascending price. The main difference between them is RDSon and manufacturer.

    http://www.digikey.com/product-detail/en/PSMN022-30PL,127/568-7512-5-ND/2606361
    http://www.digikey.com/product-detail/en/PSMN017-30PL,127/568-9506-5-ND/3152043
    http://www.digikey.com/product-detail/en/FDP8880/FDP8880FS-ND/976840
    http://www.digikey.com/product-detail/en/IRFB7546PBF/IRFB7546PBF-ND/4772484
    http://www.digikey.com/product-detail/en/IPP065N03L G/IPP065N03LGIN-ND/1996760
     
  3. Jan 19, 2015 #3
    abuhafss

    abuhafss

    348
    11
    Aug 3, 2010
    Thanks for your response.

    Any N-Channel device from any supplier which match the parameters. I have tried 2SK1388 but it would get fairly warm. Next I am planning to try NB59N10D, IRF540, IRFZ24N, and IRFZ44 (which I already have with me).

    Keeping in view the operating voltage 12V and current 3A, actually I wanted to know what RDS(on) value would be the most suitable so that the heat dissipation is minimum.
     
    Last edited: Jan 19, 2015
  4. Jan 19, 2015 #4
    BobK

    BobK

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    Jan 5, 2010
    The lowest one.

    Edit: When switching at 16Hz, the gate capacitance is not going to matter, at much higher frequencies it would.

    Bob
     
    abuhafss and Arouse1973 like this.
  5. Jan 19, 2015 #5
    KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    8,393
    1,268
    Nov 28, 2011
    Yeah, what Bob said.

    A TO-220 package doesn't need heatsinking if it's dissipating less than about 0.5W. You can calculate the maximum allowable RDSon from the power and the current:

    R = P / I2
    = 0.5 / 32
    = 56 mΩ

    All of the devices I suggested in post #2 have RDSon < 56 mΩ at VGS = 10V.
     
    abuhafss likes this.
  6. Jan 20, 2015 #6
    abuhafss

    abuhafss

    348
    11
    Aug 3, 2010
    Thanks all of you for your input.
     
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