ICB2FL01G Datasheet, PDF (18/56 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.
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).
Datasheet
Page 18 of 56
ICB2FL01G
V1.2