ICB2FL01G Datasheet, PDF (27/56 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 24) during Run Mode due
to certain deviations from the normal load (e.g. harmed lamp, sudden break of the lamp tube …), the
IC has three integrated thresholds – sensed only via the LSCS (pin 1). The controller distinguish
between two different states of capacitive load, the detection of working without load (idling detection,
CapLoad 1) and working with short over current (CapLoad 2). This state (CapLoad 2) is affecting an
operation below the resonance in the capacitive load area (Figure 24). In both cases, 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 status of the fault and restarts after the fault disappears e.g. in case of
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 24: Capacitive and Inductive Operation
Datasheet
Page 27 of 56
ICB2FL01G
V1.2