ICB1FL01G Datasheet, PDF (33/38 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

ICB1FL01G
Application Examples
R36
A
≥
V-----R----E-----S---C-----1---M------A-----X---
IRES3MIN
=
-1-1-5--^,-_,--6-1--5--_µ--V--A---
=
109, 3kΩ
Selected values in a topology with 2 lamps in parallel: R36A= 110k; R36B= 110k
Low pass filter capacitor C19
Capacitor C19 provides a low pass filter together with resistor R36 in order to suppress AC voltage drop at the
low-side filament. When we estimate an AC voltage of 10V peak-to-peak at low-side filament during run mode at
f_RUN= 40kHz, we need a suppression of a factor F_LP= 100 (-40dB).
C19 =
Selected value: C19= 15nF
2
(^---2----⋅^---π^-----⋅^{-F--f-L-R---P--U---–--N---1---}⋅^{---R----3---6---})^{- =}
2
(^---2----⋅^---π^-----⋅^{-1--4-0--0-0---k---H-–----z-1---}⋅^{---5---6----k---}) ^{= 7, 1nF}
Detection of capacitive mode operation via C18
The DC level at pin RES is set by R36 and the source current I_RES3. The preferred AC level is in the range between
∆V_ACRES= 1,5V to 2,0V at a ∆V_BUS= 410V.
Selected value: C18= 68pF.
C18
=
C19 ⋅ -^∆----V_∆----VA----B-C----U-R----SE----S--
=
15nF ⋅ ---2----V------
410 V
=
73 p F
Bandpass filters L21/C21 and L22/C22 can be used in order to conduct filament currents preferred at preheating
frequency and to suppress these currents during run mode.
Inductor L1 of the boost converter
The inductivity of the boost inductor typically is designed to operate within a specified voltage range above a
minimum frequency in order to get an easier RFI suppression. It is well known, that in critical conduction mode
(CritCM) there is a minimum operating frequency at low input voltages and another minimum at maximum input
voltage. In state-of-the-art CritCM PFC controllers we use the lowest value out of these two criterias:
At minimum AC input voltage:
2
LA = ⁽---V----I---N-----A-----C----M------I--N-4-----_⋅â‹---F---M-2----⁾-I---N--^â‹---^(â‹---VP----OB-----UU-----TS----P-–---F-⁽--C-V----I-_â‹--N-V---A-B----C-U----M-S----I---N------^â‹-------2---⁾---⁾---^â‹---^η--
At maximum AC input voltage
Preliminary Datasheet Version 1.5
33
June 2005