*****Question about MOSFET choice for circuit involving 16V cells @5Amps continuous****

Discussion in 'General Electronics Chat' started by artmaster547, Oct 6, 2016.

  1. artmaster547

    Thread Starter Member

    Jan 6, 2016
    89
    1
    Hi all
    With this thread I have included an image of the circuit I am trying to create/ammend basically with this new circuit the cells will be around 16V I wish to choose a mosfet to replace the current Mosfet that will be able to handle the higher voltages and currents (5A), I wish for it to be able to run continuously at 5A. Any pointers would be appreciated.
    Kind Regards
    Jonathan
     
  2. artmaster547

    Thread Starter Member

    Jan 6, 2016
    89
    1
    The following is a photo of the circuit, esentially this circuit is there to discharge the cells which is why I need it to have the properites mentioned before.
     
  3. wayneh

    Expert

    Sep 9, 2010
    12,145
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    Image?
    Just find a MOSFET rated to at least 15A and 20V or more, assuming that exceeds the peak voltage that it may see. Look for a low Rds-on, and be sure the gate voltage in your circuit is enough to fully turn on the MOSFET.
     
  4. artmaster547

    Thread Starter Member

    Jan 6, 2016
    89
    1
    oh sorry the image is very low quality let me take it again, do I also have to consider the Pd?
     
  5. artmaster547

    Thread Starter Member

    Jan 6, 2016
    89
    1
     
  6. artmaster547

    Thread Starter Member

    Jan 6, 2016
    89
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    would you say this MOSFET would be a good choice?
    https://www.fairchildsemi.com/datasheets/FD/FDS4559.pdf
     
  7. wayneh

    Expert

    Sep 9, 2010
    12,145
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    ? That device is 2 complementary MOSFETs in the same IC, and neither meets the current spec. Are you needing an N or P type, and what sort of load are you switching? The switching frequency is very low, right?

    And what is your gate voltage? Your schematic is confusing me.
     
  8. artmaster547

    Thread Starter Member

    Jan 6, 2016
    89
    1
    Nvm I found one that I believe to be suitable I posted the completely wrong MOSFET the following is the one that I am using now:
    http://www.infineon.com/cms/en/prod...ype=5546d462533600a401533d2eeeea0201#ispnTab1
     
    wayneh likes this.
  9. wayneh

    Expert

    Sep 9, 2010
    12,145
    3,055
    Looks better. :)
     
  10. artmaster547

    Thread Starter Member

    Jan 6, 2016
    89
    1
    Thanks again I apprecite the help
     
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