ICB2FL02G Datasheet, PDF (18/55 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

2^nd Generation FL-Controller for FL-Ballasts
Functional Description
2.3.2 Low Side Filament Detection during Run Mode
In case of an open low side filament during Run mode, the current out of the RES pin I_RES3 = - 21.3 µA
charges up the capacitor C19 in Figure 3. If the voltage at the RES pin exceeds the V_RES3 = 3.2V
threshold, the controller detects an open low side filament and stops the gate drives after a delay of t =
620µs of an internal timer.
VCC / VPFCGD
17.5 V
16.0 V
Open LOW Side Filament during Run Mode
Chip Supply Voltage
10.0 V PFC Gate Drive
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
3.2 V
1.6 V
1.3 V
IRES
21.3µA
17.7µA
VLamp
Latch Mode
Delay t = 620µs
Time
Time
VRES
5.0 V
1.6 V
1.3 V
IRES
Latch Mode
1
Time
21.3µA
17.7µA
VLamp
Timer t = 100ms
Time
Power UP into RUN Mode
2
3
Time
Time
Time
Time
Figure 10 Open Low Side Filament Run Mode Figure 11 Restart from open LS Filament
A restart is initiated when a filament is detected e.g. in case of a lamp removal. In case of a filament is
present (Figure 11 section 2), the voltage drops below 1.3V and the value of the source current out of
the RES pin is set from I_RES4 = - 17.7 µA up to I_RES3 = - 21.3 µA. The controller powers up the system
including Soft Start and Preheating into the Run mode (Figure 11 section 3).
Preliminary Datasheet
Page 18 of 55
ICB2FL02G
V1.2