ICB1FL03G Datasheet, PDF (14/38 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

ICB1FL03G
Functional Description
3.4 Detection of End-of-Life and Rectifier Effect
After ignition the lamp voltage breaks down to its run voltage level (typically 50Vpeak to 300Vpeak). Reaching the
run frequency there follows a time period of 250ms called Pre-Run Mode, in which some of the monitoring features
(EOL1, EOL2, Cap.Load1) are still disabled. In the subsequent Run Mode the End-of-life (EOL) monitoring is
enabled. The event EOL1 is detected by measuring the positive and negative peak level of the lamp voltage by a
current fed into the LVS pin (R41, R42, R43 in Fig. 11). If the sensed current exceeds 215µA for longer than 610µs
the status end-of-life (EOL1) or the exceeding of the maximum output power is detected. In Fig. 12 the different
levels of the sensed lamp voltage are illustrated.
Figure 11
R41
R42 R43
R34
C10
D9
PFCZCD
PFCGD
PFCVS
PFCCS
R35
Q2
R26
HSGD
HSVCC
HSGND
C14
Q3
R27
LSGD
LSCS
D6
R61
R30
R21R22 R23
C13
R24 R25
L2
C17
C15
C24
C18 _C16
R36
D7
D8
C19
D61
SMD-Z
Circuit diagram of the lamp inverter section.
+ Shut down level
+ Ignition level
V_LAMP-IGN
+ EOL Threshold
IV_L+PEAKI/IV _L-PEAKI
0
t
V_LAMP-RUN
- EOL Threshold
- Ignition level
- Shut down level
Figure 12 Sensed lamp voltage levels.
Preliminary Datasheet Version 1.02
14
March 2009