ICB2FL03G Datasheet, PDF (28/60 Pages) Infineon Technologies AG – 2nd Generation FL Controller for Fluorescent Lamp Ballasts

ICB2FL03G
Controller for Fluorescent Lamp Ballasts
Functional Description
2.5.2 Detection of End of Life 2 (EOL2) – Rectifier Effect
The rectifier effect (EOL2) is detected by measuring the positive and negative DC levels of the lamp voltage via a
current fed into the LVS pin (Figure 20). This current is fed into the LVS pin via the network R41, R42, R43 and
R44 (see Figure 3). If the sensed DC current exceeds ± 42 μA (Figure 20 LVSDC current) for longer than
2500 ms, the status of end-of-life (EOL2) is detected. The EOL2 fault results in a latched power-down mode (after
trying a single restart) and the controller is continuously monitoring. The insertion of a new lamp or an interruption
of the input voltage resets the status of the IC.
Lamp Voltage
2
Pos. DC Level
for EOL2 Detection
0
Neg. DC Level
for EOL2 Detection
4
t
LVSDC Current
Normal Operation
EOL2
Rectifier Effect
42 µA
0
t
- 42 µA
EOL2 Detection
t = 2500 ms
Figure 20 End of Life (EOL2) Detection, Lamp Voltage versus DC LVS Current
2.6
Detection of Capacitive Load
In order to prevent a malfunction in the area of capacitive load (see Figure 21) during run mode due to certain
deviations from the normal load (e.g. harmed lamp, sudden break of the lamp tube …), the IC has three integrated
thresholds – sensed only via the LSCS (pin 2). The controller distinguishes between two different states of
capacitive load: detection of working without load (idling detection, CapLoad 1) and working with short overcurrent
(CapLoad 2). This state (CapLoad 2) affects operation below the resonance in the capacitive load area
(Figure 23). In both cases, the IC results in a latched power-down mode after a single restart. After latching the
power-down mode, the controller continuously monitors the input voltage and lamp filaments, and restarts after
interruption of the input voltage or insertion of a new lamp.
Final Data Sheet
28
V1.1, 2013-08-14