ICB2FL01G Datasheet, PDF (25/56 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

2^nd Generation FL-Controller for FL-Ballasts
Functional Description
2.5 Detection of End-of-Life and Rectifier Effect
Two effects are present by End of Life (EOL): lamp over voltage (EOL1) and a rectifier effect (EOL2).
After Ignition (see 1 in Figure 21), the lamp voltage breaks down to its run voltage level with
decreasing frequency. By reaching the run frequency, the IC enters the Pre Run Mode for 625 ms.
During this period, the EOL detection is still disabled. In the subsequent RUN Mode (2 in Figure 21)
the detection of EOL1 (lamp over voltage see 3 Figure 21) and EOL2 (rectifier effect see 4 Figure 21)
is complete enabled.
Figure 21: End of Life and Rectifier Effect
2.5.1 Detection of End of Life 1 (EOL1) – Lamp Overvoltage
The event of EOL1 is detected by measuring the positive and negative peak level of the lamp voltage
via an AC current fed into the LVS pin (Figure 22). This AC current is fed into the LVS pins (LVS1 for
single lamp and LVS2 for multi lamp applications) via Network R41, R42, R43 and the low pass filter
C40 and R45 see Figure 3. If the sensed AC current exceeds 210 µA_PP for longer than 620 µs, the
status of end-of-life (EOL1) is detected (lamp overvoltage / overload see Figure 22 LVSAC Current).
The EOL1 fault results in a latched power down mode (after trying a single restart) the controller is
continuously monitoring the status until EOL1 status changes e.g. a new lamp is inserted.
Figure 22: End of Life (EOL1) Detection, Lamp Voltage versus AC LVS Current
Datasheet
Page 25 of 56
ICB2FL01G
V1.2