Describe with neat sketch the V-I characteristics of TRIAC.

Ans:

V-I characteristics of TRIAC:

Description: 

TRIAC characteristics lie in two quadrants as shown in the figure above. Graphs for mode1 & mode 2 lie in the first quadrant while mode3 & mode 4 in fourth quadrant. Both the graphs are identical. Each graph can be divided into 2 regions as below, 

1. Blocking region (OFF state): In the first quadrant, when MT2 is made positive w.r.t. MT1 with a positive or negative gate current, the graph lies in the first quadrant. Initially, till the breakover voltage of the device is applied, only a small leakage current flows indicated by the region OA.
2.  Conduction region (ON state): After the breakover voltage(VBO1) is applied, the device goes into conduction with a sharp increase in current but with a considerable reduction in the voltage across the device. This region of the graph is indicated by the region AB.