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How to trigger a triac?

Discussion in 'General Electronics Discussion' started by Texton, Mar 1, 2013.

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  1. Texton

    Texton

    14
    0
    Jul 27, 2012
    Hi all.

    I need to trigger a triac using a microcontroller, the question is how long does my trigger pulse have to be to enable the triac?

    I found a value named: "gate-controlled turn-on time = 2us" in a datasheet. But is this is value i am looking for?

    Thanks in advance :)
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,513
    2,651
    Nov 17, 2011
  3. BobK

    BobK

    7,682
    1,688
    Jan 5, 2010
    Or use an optically isolated triac.

    Bob
     
  4. rajnish

    rajnish

    3
    0
    Mar 6, 2013
    Triacs can be triggered by either a positive or a negative current applied to its gate electrode , Once triggered, the device continues to conduct until the current drops below a certain threshold.
     
  5. TedA

    TedA

    156
    16
    Sep 26, 2011
    Triggering triacs can be very complicated. Both the gate current and the load current through the main terminals are important factors, along with time and temperature. Polarities matter.

    2us seems like a pretty short time. Triacs tend to be slow.

    To get more specific advice you will need to tell us more about what you are doing. Triac P/N ( Link to datasheet?), volts, amps, ohms, reactances, Hz.

    Do you need isolation? Some times you don't.

    Ted
     
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