AN2777

TRIAC turn-off behavior

Doc ID 14748 Rev 1

5/13

The value of (dI/dt)c decreases if the reapplied (dV/dt)c is increasing. The value of (dI/dt)c

also strongly decreases if the junction temperature is increasing. Figure 5 gives the (dI/dt)c

relative variation according to the junction temperature for a Snubberless TRIAC from

means that the specified (dI/dt)c has been chosen so that it is guaranteed whatever the

reapplied (dV/dt)c [see References 1.] Thus there is no need to add an R-C snubber circuit

across the TRIAC to help it to turn-off [see References 2.]

Figure 5.

BTB12-600CW (dI/dt)c variation with junction temperature

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