ICB1FL02G Datasheet, PDF (33/37 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

ICB1FL02G
Application Examples
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= 82pF.
C18
=
C19 ⋅ -^∆----V_∆----VA----B-C----UR-----SE----S--
=
22nF ⋅ ---2----V------
410 V
=
107 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--
2
LA
=
(_{---1---8---0---V------}⋅_-------2----)_-------⋅_---(_{--4---1---0----V-----–-----}(_{--1---8---0----V------}⋅_-------2---)_---)_---⋅_---0---,_---9---5--
4 ⋅ 25kHz ⋅ 60W ⋅ 410V
=
3, 89mH
At maximum AC input voltage
2
LB = ⁽---V----I---N-----A-----C----M------A-----X-4----_⋅â‹---F----M-2---⁾--I--N---^â‹---^(â‹--V-P---O-B----UU-----TS----P-–---F-⁽---CV----I-_â‹--N-V----A-B---C-U----M-S-----A-----X-----^â‹--------2---⁾--⁾----^â‹---^η--
2
LB
=
-⁽--2---7---0---V------^â‹-------2----⁾-------^â‹---⁽--4---1---0---V------–-----⁽--2---7---0----V------^â‹-------2---⁾---⁾---^â‹---0---^,---9---5--
4 ⋅ 25kHz ⋅ 60 W ⋅ 410V
=
1, 58mH
With the new control principle for the PFC preconverter we have a third criteria that covers the maximum on-time
t_PFCOM-MAX= 23,5µs:
LC = -⁽--V----I---N-----A-----C----M----4--I--N_â‹---P---^â‹-O-----U-2----T⁾---^â‹-P--T--F--O-C----N-----M------A----X------^â‹---^η--
LC
=
-⁽--1---8---0----^â‹--------2---⁾----^â‹---2---3---^,---5---^µ----s----^â‹---0---^,---9---5-
4 ⋅ 60 W
=
6, 03mH
With the assumed conditions the lowest value out of L_A, L_B, L_C is 1,58mH.
Selected value: L1= 1,58mH.
Datasheet Version 1.2
33
February 2006