Another fet question

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    • June 22, 2004 at 9:43 pm #10593
      HACHI-RYOKU
      Participant
      • Posts: 286

      If I have a dual cell with all npn fets and a dual cell with 2 npn fets and 2 pnp fets, will one be faster. The pnp fets have a higher on voltage, but that shouldn’t drop the speed or anything right?

    • June 23, 2004 at 12:33 am #32203
      micro_Amps
      Participant
      • Posts: 1290

      It might if the fets are not turned on fully you might find power to the H bridge restricted slightly. Dual cell with P & N fets does work well, but I havent actually trested them side by side, I usually just use N chanel fets as they are lower resistance anyway (I think ?)
      🙂 uA

    • June 23, 2004 at 12:34 am #32204
      ph2t
      Participant
      • Posts: 2088

      the one with all n-chan fets will be faster. the p-chans are prolly the IRLML6401 model that isn’t as efficient as the IRLML2502 (nchan).

      speed difference will be minimal though. torque on the other hand…………

      ph2t.

    • June 23, 2004 at 2:16 am #32207
      jamiekulhanek
      Participant
      • Posts: 2563

      Good to see ya uA haven’t seen you on here in ages.

    • June 23, 2004 at 2:22 am #32208
      ph2t
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      • Posts: 2088

      yea, I’m sure he’s a busy busy boy….. 🙂

    • June 23, 2004 at 5:47 am #32213
      matic
      Participant
      • Posts: 62
      Quote:
      speed difference will be minimal though. torque on the other hand…………

      …will be less efficient also

    • June 23, 2004 at 5:40 pm #32201
      HACHI-RYOKU
      Participant
      • Posts: 286

      Will triple stacking them require more on voltage? That would be parrallel, so it should be the same right?

    • June 23, 2004 at 11:17 pm #32156
      micro_Amps
      Participant
      • Posts: 1290
      Quote:
      Good to see ya uA haven’t seen you on here in ages……
      yea, I’m sure he’s a busy busy boy….. 🙂

      I am still here on most days just for a peek and to see whats happening. Work is overwhelming atm, but has its good points as well ($$$)
      Dont want to hijack this thread so I’ll stay on topic…

      How did you go Hachi? any luck there?
      🙂 uA

    • June 24, 2004 at 1:54 am #32151
      matic
      Participant
      • Posts: 62
      Quote:
      Will triple stacking them require more on voltage? That would be parrallel, so it should be the same right?

      I think so… since fets are stacked parallel same voltage is aplied on each fet….

    • June 24, 2004 at 3:49 am #32145
      micro_Amps
      Participant
      • Posts: 1290

      Not so, so long as the gates are connected in parrallel as well all of the connected fets will only need the same voltage to be turned on.
      If you know what I mean,
      :)uA

    • June 26, 2004 at 2:47 am #32129
      HACHI-RYOKU
      Participant
      • Posts: 286

      Sorry, I just got back to the States, and am working on getting all nestled in. Work on this project is on/off. Will get the project done soon though.

      It is good to see you back.

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