ICB2FL01G Datasheet, PDF (28/56 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

2^nd Generation FL-Controller for FL-Ballasts
Functional Description
2.6.1 Capacitive Load 1 (Idling Detection – Current Mode Preheating)
A capacitive load 1 operation (idling) is detected when the voltage at the LSCS pin is below + 100 mV
during the second 50% ON – time of the low side MOSFET (see Capacitive Load 1 (Idling) in Figure
25). If this status is present for longer than 2500 ms, the controller results a latched power down mode
after trying a single restart. The controller is keep monitoring continuously the status until an adequate
load is present (e.g. lamp removal), than the IC changes into a normal operation.
Figure 25: Capacitive Mode 1 Operation without load during Run Mode
2.6.2 Capacitive Load 2 (Over Current / Operation below Resonance)
A capacitive load 2 operation is detected if the voltage at the LSCS pin drops below a second
threshold of V_LSCS = – 100 mV directly before the high side MOSFET is turned on or exceeds a third
threshold of V_LSCS = 2.0 V during ON switching of the high side MOSFET. If this over current is present
for longer than 620 µs, the IC results a latched power down mode after trying a single restart. The
controller keeps monitoring continuously the status until an adequate load is present e.g. a new lamp
is inserted, then the IC changes into a normal operation.
Normal Operation
Capacitive Load 2 (Over Current)
V_DSLS
I_DSLS
V_GateHS
V_GateLS
V_LSCS
+ 2.0 V
V_DSLS
I_DSLS
V_GateHS
V_GateLS
V_LSCS
+ 2.0 V
- 100 mV
- 100 mV
t_{CAPLOAD 1} t_{CAPLOAD 2}
Figure 26: Capacitive Mode 2 – Operation with Over Current
Datasheet
Page 28 of 56
t_{CAPLOAD 2}
ICB2FL01G
V1.2