ICB2FL03G Datasheet, PDF (27/60 Pages) Infineon Technologies AG – 2nd Generation FL Controller for Fluorescent Lamp Ballasts

ICB2FL03G
Controller for Fluorescent Lamp Ballasts
Functional Description
Lamp voltage
Pos. Ignition Level
Pos. AC Level
for EOL1 Detection
Positive DC Level
1
2
for EOL2 Detection
0
Negative DC Level
for EOL2 Detection
3
4
t
t
Neg. AC Level
for EOL 1 Detection
Neg. Ignition Level
Ignition
Normal Operation
EOL1
Lamp Overvoltage
EOL2
Rectifier Effect
Figure 18 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 levels of the lamp voltage via an AC
current fed into the pin LVS (Figure 19). This AC current is fed into the LVS pins via the 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 19 LVSAC
current). The EOL1 fault results in a latched power-down mode (after trying a single restart). The controller
continuously monitors the status until the EOL1 status changes – e.g. a new lamp is inserted.
Lamp Voltage
Pos. AC Level
for EOL1 Detection
0
Neg. AC Level
for EOL1 Detection
LVSAC Current
105µAPeak
0
2
Normal Operation
2
3
t
EOL1
Lamp Overvoltage
3
t
- 105µA_Peak
EOL1 Detection
t = 620 µs
Figure 19 End of Life (EOL1) Detection, Lamp Voltage versus AC LVS Current
Final Data Sheet
27
V1.1, 2013-08-14