ICB2FL03G Datasheet, PDF (20/60 Pages) Infineon Technologies AG – 2nd Generation FL Controller for Fluorescent Lamp Ballasts

ICB2FL03G
Controller for Fluorescent Lamp Ballasts
Functional Description
The IC comparators are then set to a threshold of V_RES1 = 1.3 V and to I_RES4 = - 17.7μA, the controller waits until
the voltage at the RES pin drops below V_RES1 = 1.3 V.
When a filament is present (Figure 9, section 2), the voltage drops below 1.3 V 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 then powers up the system,
including soft start and preheating, into the run mode.
2.3.2 Low Side Filament Detection during Run Mode
In the case of an open low side filament during run mode, the current flowing 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 = 3.2 V threshold, the
controller detects an open low side filament and stops the gate drives after a delay of t = 620 μs 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
VRES
5.0 V
3.2 V
1.6 V
1.3 V
IR ES
21.3µA
17.7µA
VLamp
Latch Mode
Time
Time
Delay t = 620µs
Time
Time
Figure 10 Open Low Side Filament Run Mode
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 11 Restart from Open LS Filament
Final Data Sheet
20
V1.1, 2013-08-14