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21

RPLLNR3

Figure 18 shows the voltage in the SD pin and the voltage on the lamp in these 4 cases: no end of life,

DC end of life (upper cathode deteriorated and lower cathode deteriorated) and AC end of life (both

filaments deteriorated in the same way).

Figure 18: Voltage in the SD pin and voltage on the lamp in these 4 cases:

no end of life, DC end of life and AC end of life.

2V

3V

1V

2V

3V

1V

2V

3V

1V

2V

3V

1V

0V

Vspec

0V

0V

0V

Vspec + 30%

-Vspec - 30%

Vspec + 30%

-Vspec - 30%

SD pin Voltage

Lamp Voltage

Vspec = VpK in the spec of the

lamp