Practical results

AN392

8/11

Doc ID 1863 Rev 2

Figure 6 presents the soft start operation for an incandescent lamp rated at 150 W, 230 V.

Thanks to the embedded soft start, the peak in-rush current is about 3 times the nominal

current compared with 8 to 10 times otherwise. Therefore, the lamp life time is improved.

Figure 6.

Soft start for 150 W, 230 V incandescent lamp

Voltage across TRIAC VT: 100 V/div

TRIAC current IT: 1.0 A/dic

T

100 ms/div

100 ms/div