ICB1FL02G Datasheet, PDF (35/37 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

ICB1FL02G
Application Examples
7.3 Multilamp Ballast Topologies
How to use ICB1FL02G in multi-lamp topologies is demonstrated in the subsequent figures. In figure 18 we see
an application for a single lamp with current mode preheating. Compared with figure 17 the difference is the
connection of the resonant capacitor in series with the filaments. In respect of operating behaviour the current
mode preheating cannot be designed with same variation of operating parameters: the preheating current is
typically lower and lamp voltage during preheating higher than in topologies with voltage mode preheating.
90 ...
270 VAC
PFCZCD
PFCGD
PFCVS
PFCCS
HSGD
HSVCC
HSGND
LSGD
LSCS
Figure 18 Application Circuit of a Ballast for a single Fluorescent Lamp with current mode Preheating.
A topology for two lamps is shown in figure 19. Both lamps including their individual resonant circuit are operating
in parallel at the same inverter output. Such a topology can be done with voltage mode preheating in the same
way. As the control IC is designed to operate such a 2-lamp topology without restrictions in respect to the
monitoring functions, the IC-specific effort is to activate the second lamp voltage sense (LVS2) and an additional
resistor at pin RES in order to sense the lamp removal of the second low-side filament.
90 ...
270 VAC
PFCZCD
PFCGD
PFCVS
PFCCS
HSGD
HSVCC
HSGND
LSGD
LSCS
Figure 19 Application circuit of a Ballast for two Fluorescent Lamps in parallel with current mode Preheating.
Beside a topology with paralleled lamps it is possible of course to use two lamps in series. In this way we come
to a 4-lamp topology shown in figure 20. The lamp voltage is sensed of each of the two series connections. The
lamp removal is detected on the high-side filaments of the high-side lamps and on the low-side filaments of the
Datasheet Version 1.2
35
February 2006