ICB2FL01G Datasheet, PDF (19/56 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

2^nd Generation FL-Controller for FL-Ballasts
Functional Description
2.3.3 Start Up with broken High Side Filament
An open high side filament during the start up hysteresis (10.6V < V_CC < 14.1V) is detected, when the
current into the LVS pin 13 or 14 is below I_LVS = 12 µA (typically). In that case, the current out of the
RES pin 12 rises up to I_RES1 = - 42.6 µA. That causes a voltage at the RES pin crosses V_RES1 = 1.6V.
The source current is now set to I_RES2 = - 35.4 µA and another threshold of V_RES2 = 1.3V is active. The
controller prevents a power up (see Figure 12), the gate drives of the PFC and inverter stage do not
start working.
VCC
17.5 V
16.0 V
14.1 V
Start UP with OPEN HIGH Side Filament
Chip Supply Voltage
VCC
17.5 V
16.0 V
14.1 V
Restart from open HIGH Side Filament
Chip Supply Voltage
10.6 V
10.6 V
V_RES
UVLO
Start Up
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
ILVS
Time
Time
Time
Time
VRES
2.0 V
1.6 V
1.3 V
No Power Up
IRES
42.6µA
35.4µA
21.3µA
17.7µA
I_LVS
12µA
VLamp
IRES
ILVS
Time
Power UP (into RUN Mode)
Time
Time
Time
Time
Time
Figure 12: Start Up with open high Side
Filament
Figure 13: Restart from open high Side
Filament
When the high side filament is present, e.g. insert a lamp, the current of the active LVS pins exceeds
I_LVS > 12 µA (typically), the res current drops from I_RES2 = - 35.4 µA down to I_RES4 = - 17.7 µA (Figure
13). Now the controller senses the low side filament. When a low side filament is also present, and the
controller drops (after a short delay due to a capacitor at the res pin) below V_RES2 = 1.3V, the res
current is set to I_RES3 = - 21.3 µA, the controller powers up the system.
Datasheet
Page 19 of 56
ICB2FL01G
V1.2