ICB2FL03G Datasheet, PDF (19/60 Pages) Infineon Technologies AG – 2nd Generation FL Controller for Fluorescent Lamp Ballasts

ICB2FL03G
Controller for Fluorescent Lamp Ballasts
Functional Description
2.3
Filament Detection during Start-Up and Run Mode
The low and high side filament detection is sensed via the RES and the LVS pins. The low side filament detection
during start-up and run mode is detected via the RES pin only. An open high side filament during start-up will be
sensed via the LVS and the RES pins.
2.3.1 Start-Up with broken Low Side Filament
A source current of I_RES3 = -21.3 μA from the RES pin (13) monitors the existence of a low side filament during a
start-up (also in run mode). In the case of an open low side filament during the start-up hysteresis (10.6 V < V_CC
< 14.0 V) a capacitor (C19 in Figure 3) will be charged up via I_RES3 = -21.3 μA. When the voltage at the RES pin
(13) exceeds V_RES1 = 1.6 V, the controller prevents a power up and clamps the RES voltage internally at V_RES
= 5.0 V. The gate drives of the PFC and inverter stage do not start working.
V_CC
17.5 V
16.0 V
14.0 V
Start UP with open LOW Side Filament
Chip Supply Voltage
10.6 V
Start Up
VRES ^{UVLOHysteresis}
5.0 V
No Power UP
1.6 V
1.3 V
IRES
21.3µA
17.7µA
VLamp
Time
Time
Time
Time
Figure 8 Start-Up with Open Low Side Filament
17.5 V
16.0 V
Restart from open LOW Side Filament
Chip Supply Voltage
10.0 V
PFC Gate Drive
VRES
5.0 V
1.6 V
1.3 V
IRES
21.3µA
17.7µA
Latch Mode
1
VLamp
Timer t = 100 ms
Time
Power UP into RUN Mode
2
3
Time
Time
Time
Figure 9 Restart from Open Low Side Filament
Final Data Sheet
19
V1.1, 2013-08-14