ICB2FL02G Datasheet, PDF (13/55 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

2^nd Generation FL-Controller for FL-Ballasts
Functional Description
This mode is in order to prevent a malfunction of the IC due to an instable system e.g. the lamp
parameters are not in a steady state condition. After finish the 625 ms Pre Run phase, the IC switches
over to the Run mode (phase 8 Figure 4) with a complete monitoring.
2.2.1 Operating Levels from UVLO to Soft Start
This chapter describes the operating flow from phase 1 (UVLO) until phase 4 (Soft Start) in detail. The
control of the ballast is able to start the operation within less than 100 ms (IC in active Mode). This is
achieved by a small Start Up capacitor (about 1µF C12 and C13 – fed by start up resistors R11 and
R12 in Figure 3) and the low current consumption during the UVLO (I_VCC = 130 µA – phase 1 Figure 5)
and Start Up Hysteresis (I_VCC = 160 µA – defines the start up resistors – phase 2 Figure 5) phases.
The chip supply stage of the IC is protected against over voltage via an internal Zener clamping
network which clamps the voltage at 16.3 V and allows a current of 2.5 mA. For clamping currents
above 2.5 mA, an external Zener diode (D9 Figure 3) is required.¹
Frequency /
Lamp Voltage
135 kHz
Frequency
100 kHz
V_BUS
100 %
95 %
Lamp Voltage
30 %
VCC
17.5 V
16.0 V
14.1 V
10.6 V
I_VCC
VRES
1.6 V
IRES
I_LVS
1
UVLO
130 µA
2
Monitoring
3
4
Start Up Soft Start
< 160 µA
< 6.0 mA + I_Gate
- 21.3 µA
> 18 µA
< 210µApp
Figure 5 Progress of Level during a typical Start – UP
1 _{IGate depends on MOSFET}
Preliminary Datasheet
Page 13 of 55
ICB2FL02G
V1.2