ICB2FL02G Datasheet, PDF (34/55 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

2^nd Generation FL-Controller for FL-Ballasts
2.8.1.2
IC remains in Pre Heating Phase
Functional Description
This feature gives the customer the flexibility to align the pre heating frequency to the filament power
in the pre heating phase. Figure 30 shows a standard start up with the set preheating time of e.g.
820ms with an 8.2 kΩ resistor at the RTPH pin 11. To force the IC remains in pre heating, the voltage
level at the RTPH pin 11 has to set to 5.0 V. The duration of this 5.0 V signal defines the time of the
pre heating see I_PreHeat in figure below.
VCC
17.5 V
16.0 V
14.1 V
10.6 V
Chip Supply Voltage
Start Up
VRTPH ^UVLO _Hysteresis
5.0 V
2.5 V
IPreHeat
Duration is set by
Resistor only
VLamp
Preheating
t = 820 ms when using
RRTPH = 8.2kOhm
IGNITION
Time
Time
Time
Time
Figure 30 Start UP with Pre Heating
Figure 31 Start UP IC REMAINS in Pre Heating
Preliminary Datasheet
Page 34 of 55
ICB2FL02G
V1.2