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LTspice model for DB3 DIAC

Discussion in 'Electronic Design' started by P E Schoen, Feb 19, 2013.

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  1. P E Schoen

    P E Schoen Guest

    I was trying to design a simple voltage relay in LTspice and I wanted to use
    a DIAC, but I had a hard time finding a model that worked. Finally I found
    the following in an obscure Japanese or Chinese website

    * PSpice Model Editor - Version 9.2

    *SRC=DB3; 32V 2A
    ..SUBCKT DB3 1 2
    QN1 5 4 2 NOUT; OFF
    QN2 8 6 7 NOUT; OFF
    QP1 6 8 10 POUT; OFF
    QP2 4 5 9 POUT; OFF
    D1 7 9 DZ
    D2 2 10 DZ
    DF 4 3 DZ; OFF
    DR 6 3 DZ; OFF
    RF 4 3 1.13E+7
    RR 6 3 1.13E+7
    RT2 1 7 0.755
    RH 7 6 10k
    RH2 4 2 10k
    ..MODEL DZ D (IS=321F RS=100 N=1.5 IBV=10N BV=30.3)
    ..MODEL POUT PNP (IS=321F BF=100 CJE=134p TF=25.5U)
    ..MODEL NOUT NPN (IS=321F BF=200 CJE=134p CJC=26.8p TF=1.7U)

    Some other less useful sites are:

    The website is supposed to have models but it redirects to an
    under construction page :(

    What I want to do is replace a voltage relay in an octal enclosure that
    determines if the voltage is nominally 120 VAC or 208/240 VAC, and allowing
    the mains voltage to be applied to the power section of the unit only if it
    is properly configured in series or parallel. The present design uses a
    capacitor dropper circuit that has proven unreliable in the field, probably
    from high current spikes due to high frequency components of the waveform.

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