AN3040

List of figures

Doc ID 16181 Rev 2

3/27

List of figures

Figure 1.

4 x 18 W T8 ballast demonstration board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2.

Electrical architecture used for four-lamp electronic ballasts . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 3.

Electrical schematic 4 x 18 W T8 - main wide range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 4.

EOL circuit for first-series lamp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 5.

L6585DE startup sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 6.

One lamp ignition phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 7.

Lamp voltage and current in run mode condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Figure 8.

Run mode, rectifying effect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 9.

Ignition phase with broken lamps: case 1 (lamp 1 works, lamp 2 is broken, lamp 3 is

broken, lamp 4 works) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 10.

Ignition phase with broken lamps: case 2 (lamp 1 is broken, lamp 2 works, lamp 3 is

broken, lamp 4 works) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Figure 11.

Conducted emissions at 110 Vac 50 Hz - line 1 peak detector . . . . . . . . . . . . . . . . . . . . . 19

Figure 12.

Conducted emissions at 110 Vac 50 Hz - line 2 peak detector . . . . . . . . . . . . . . . . . . . . . 19

Figure 13.

Conducted emissions at 230 Vac 50 Hz - line 1 peak detector . . . . . . . . . . . . . . . . . . . . . 19

Figure 14.

Conducted emissions at 230 Vac 50 Hz - line 2 peak detector . . . . . . . . . . . . . . . . . . . . . 20

Figure 15.

Connecting four lamps to the ballast . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 16.

Automatic restart circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21