Transcription of A SPICE MODEL FOR TRIACs (preliminary version; incomplete)
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A SPICE MODEL FOR TRIACs (preliminary version; incomplete)
IntroductionBerkeley SPICE is the most popular program for simulat-ing the behavior of electronic circuits. The biggest stum-bling block most engineers run into is turning companyspecifications or vendor data sheets into SPICE devicemodels that emulate real devices and run without prob-lems. Here is an approach which works well for an TRIACand derives directly from data book triac is a bi-lateral switch that can be triggered intoconduction regardless of its polarity. It is modeled byusing two NPN/PNP transistor pairs connected back-to-back as shown on the left of Figure 4. The base of eachtransistor is connected to the collector of the other.
scaled from them. Naturally, the more data you enter, the more exact the model will be. Figure 5 shows the triac entry screen from SPICEMOD. This model and method are used for the TRIAC in the
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