ICB2FL03G Datasheet, PDF (31/60 Pages) Infineon Technologies AG – 2nd Generation FL Controller for Fluorescent Lamp Ballasts

ICB2FL03G
Controller for Fluorescent Lamp 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 PFC bus undervoltage. In order to meet the emergency
lighting standards, the controller distinguishes between two different states of PFC bus undervoltage: short- and
a long-term PFC bus undervoltage. A timer increases the time as long as bus undervoltage is present. Short-term
bus undervoltage is detected if the timer value stays below t < 800 ms typical (500 ms min.) after the bus voltage
reaches the nominal level again. This causes a restart without preheating (emergency standard of VDE0108) –
see Figure 25. If the timer exceeds t > 800 ms, the controller forces a complete restart of the system due to long-
term bus undervoltage (Figure 26).
2.7.1 Short-term PFC Bus Undervoltage
Short-term PFC bus undervoltage (Figure 25) is detected if the duration of the undervoltage does not exceed
800 ms (timer stays below t < 800 ms, see Figure 25). In that case, the PFC and inverter drivers are immediately
switched off and the controller continuously monitors the status of the bus voltage in a latched power-down mode
(I_CC < 170 μA). If the signal at the LVS pin exceeds 18 μA and the rated bus voltage is above 12.5 % while the
timer is below t < 800 ms, the controller restarts from power up without preheating. The timer resets to 0 when
entering run mode.
Bus Voltage Drop for t < 800 ms
Restart without Preheating
V_{BU SR a te d}
100%
Interrupt for
t < 800 ms
75%
V_CC
16V
Power Down
RUN Mode
Mode
Pre Run
Run Mode
I_CC
Timer
< 6 mA +
I_QGate
< 160 µA
< 6 mA + I_QGate
t = 800ms
I_Preheating
V_Lamp
Figure 25 BUS Voltage Drop below 75% (rated Bus Voltage) for t < 800 ms during RUN Mode
Final Data Sheet
31
V1.1, 2013-08-14