ICB2FL02G Datasheet, PDF (30/55 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

2^nd Generation FL-Controller for FL-Ballasts
Functional Description
2.7 Emergency Lighting
Line interruptions (bus voltage drops) are detected by the PFCVS. If the rated PFC bus voltage drops
below V_BUSRated < 75 % during run mode, the controller detects a PFC bus under voltage. In order to
meets the emergency lighting standards, the controller distinguishes two different states of a PFC bus
under voltage, a short and a long term PFC bus under voltage. A timer increases the time as long as a
bus under voltage is present. A short term bus under voltage is detected if the timer value stays below
t < 800ms typically (500ms min.) after the bus voltage reaches the nominal level again. These causes
a restart without preheating (emergency standard of VDE0108) see Figure 26. When the timer
exceeds t > 800 ms, the controller forces a complete restart of the system due to a long term bus
under voltage (Figure 27).
Preliminary Datasheet
Page 30 of 55
ICB2FL02G
V1.2