ICB2FL02G Datasheet, PDF (25/55 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 20), 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 20)
the detection of EOL1 (lamp over voltage see 3 Figure 20) and EOL2 (rectifier effect see 4 Figure 20)
is complete enabled.
Figure 20 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 21). This AC current is fed into the LVS pins (LVS1 for
single lamp and LVS2 for multi lamp applications) via Network R41, R42, R43, R44 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 21 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 21 End of Life (EOL1) Detection, Lamp Voltage versus AC LVS Current
Preliminary Datasheet
Page 25 of 55
ICB2FL02G
V1.2