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. Thisproduces positive feedback, resulting in the required switch-ing action. At MT2, the emitter metallization overlaps thebase of the NPN transistor. This forms a lateral resistor inthe base (P) region and is shown as RH in the MODEL .
Introduction Berkeley 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 company
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