What mosfet to use

Discussion in 'General Electronics Chat' started by electronucks, Jun 20, 2012.

  1. electronucks

    Thread Starter New Member

    Jun 16, 2012
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    I have a TI UCC383-adj chip and need to use the inhibit pin however the inhibit pin is for a N/C switch. I need to use a small tact switch so i must convert it to a N/O . I know i will need to use a mosfet but what kind? Does anyone have a mosfet part number that will work for this

    Btw the chip will be ran off a 7.4v li-po . Heres the datasheet for the chip
    http://www.ti.com/lit/ds/symlink/ucc383-adj.pdf

    Things i need
    -Small package recomended
    - cheapest mosfet possible
    -How to use it in the circuit

    Thanks
     
  2. takao21203

    Distinguished Member

    Apr 28, 2012
    3,577
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    Fdv301

    tsm2303
     
  3. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,386
    1,605
    2N7000


    (plus some more dummy characters so the post gets accepted)
     
  4. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
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    Are you talking about the SD/CT pin that you pull low to enable shutdown?
    Maybe you mean you have a momentary switch or something?
    Did you read page 8?
     
  5. electronucks

    Thread Starter New Member

    Jun 16, 2012
    14
    0
    No, nothing to do with shutdown . I need it so i can use a low amp tact(mometary) switch.Thats why i need to use the inhibit/on/off pin however they dont make tact switches in N/C configuration which is why i need to change that to be able to use a N/O switch.I guess using a mosfet of vin will work too.

    Basically anyway possible that i can use a N/O tact switch to turn the thing on and not need a 5A pushbutton or N/C switch.
     
    Last edited: Jun 20, 2012
  6. Bernard

    AAC Fanatic!

    Aug 7, 2008
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    Just about any N ch FET, BS170 [R. S.], 2N7000?, NTE490, etc.
     
  7. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    Of course, you could always use a pull up resistor on the inhibit pin and a common NO switch to ground and skip the FET altogether.
     
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