ICB2FL03G Datasheet, PDF (21/60 Pages) Infineon Technologies AG – 2nd Generation FL Controller for Fluorescent Lamp Ballasts

ICB2FL03G
Controller for Fluorescent Lamp Ballasts
Functional Description
A restart is initiated when a filament is detected e.g. in the case of a lamp removal. If a filament is present
(Figure 11, section 2), the voltage drops below 1.3 V and the value of the source current flowing 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).
2.3.3 Start-Up with Broken High Side Filament
An open high side filament during the start-up hysteresis (10.6 V < V_CC < 14.0 V) is detected when the current into
the LVS pin 12 is below I_LVS = 12 μA (typically). In that case, the current flowing out of the RES pin 13 rises up to
I_RES1 = -42.6 μA. This causes the voltage at the RES pin to cross V_RES1 = 1.6 V. The source current is now set to
I_RES2 = -35.4 μA and another threshold of V_RES2 = 1.3 V is active. The controller prevents a power-up (see
Figure 12), and the gate drives of the PFC and inverter stage do not start working.
V_CC
17.5 V
16.0 V
14.0 V
10.6 V
Start UP with OPEN HIGH Side Filament
Chip Supply Voltage
V_RES
Start Up
UVLO _Hysteresis
2.0 V
1.6 V
1.3 V
No Power UP
I_RES
42.6µA
35.4µA
21.3µA
17.7µA
I_LVS
12µA
V_Lamp
I_RES
I_LVS
Time
Time
Time
Time
Time
Figure 12 Start-Up with Open High Side Filament
Final Data Sheet
21
V1.1, 2013-08-14