ICB2FL01G Datasheet, PDF (29/56 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

2^nd Generation FL-Controller for FL-Ballasts
Functional Description
2.6.3 Adjustable self adapting Dead Time
The dead time between the turn OFF and turn ON of the half – bridge drivers is adjustable (C16 see
Figure 3) and detected via a second threshold (– 100 mV) of the LSCS voltage. The range of the dead
time adjustment is 1.25 µs up to 2.5 µs during all operating modes. Start of the dead time
measurement is the OFF switching of the high side MOSFET. The finish of the dead time
measurement is, when V_LSCS drops for longer than typical 280ns (internal fixed propagation delay)
below -100mV. This time will be stored (stored dead time) and the low side gate driver switches ON.
The high side gate driver turns ON again after OFF switching of the low side switch and the stored
dead time.
V_DSLS
Normal Operation in RUN Mode
V_LSCS = -100mV
V_LSCS
Gate LS
END of Dead Time
Measurement
Gate HS
START of Dead Time
Measurement
Dead Time
280 ns
Propagation Delay
Dead Time
Stored Dead Time
Stored Dead Time
Figure 27: Dead Time of ON and OFF of the Half Bridge Drivers
Datasheet
Page 29 of 56
ICB2FL01G
V1.2