ICB2FL02G Datasheet, PDF (27/55 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

2^nd Generation FL-Controller for FL-Ballasts
Functional Description
2.6 Detection of Capacitive Load
In order to prevent a malfunction in the area of Capacitive Load (see Figure 23) during Run Mode due
to certain deviations from the normal load (e.g. harmed lamp, sudden break of the lamp tube …), the
IC has two integrated thresholds – sensed only via the LSCS (pin 1). The controller detects working
with short over current (CapLoad 2). This state (CapLoad 2) is affecting an operation below the
resonance in the capacitive load area (Figure 23). In this case the IC results in a latched power down
mode after a single restart. After latching the power down mode, the controller is continuously
monitoring the input voltage and lamp filaments and restarts after interrupting the input voltage or
inserting a new lamp.
Lamp Voltage vs Frequency @ different Modes
1000
900
800
700
600
500
400
300
200
100
0
10000
1000
Area of Capacitive
Load Behavior
900
Area of Inductive ₈₀₀
Load Behavior
700
IGNITION
600
500
400
300
Load
PRE Run
and
RUN Mode
After
IGNITION
Frequency [Hz]
200
100
Pre Heating
0
100000
After Ignition
Before Ignition
Figure 23 Capacitive and Inductive Operation
Preliminary Datasheet
Page 27 of 55
ICB2FL02G
V1.2