ICB1FL03G Datasheet, PDF (33/38 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

ICB1FL03G
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-----_BC----_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‹---_⋅(---^VP----_OB-----_UU-----_TS----_P-–---_F-⁽--_CV-----^I-_â‹-^N--_V---^A-_B----^C-_U---^M--_S----^I---^N------^â‹-------²---⁾---⁾---^â‹---^η--
2
LA = ⁽---¹---⁸---⁰---^V------^â‹-------²----⁾-------^â‹---⁽--⁴---¹---⁰---^V------–-----⁽--¹---⁸---⁰----^V------^â‹-------²---⁾---⁾---^â‹---⁰---^,---⁹---⁵-- = 3, 89mH
4 ⋅ 25kHz ⋅ 60 W ⋅ 410V
At maximum AC input voltage
2
LB
=
-⁽--^V----^I---^N-----^A-----^C----^M------^A-----^X-----^â‹--------²---⁾-------^â‹---⁽--^V-----^B----^U-----^S-----–----⁽---^V----^I---^N-----^A----^C-----^M------^A----^X------^â‹--------²---⁾--⁾----^â‹---^η--
4 ⋅ FMIN ⋅ POUTPFC ⋅ VBUS
2
LB = ⁽---²---⁷---⁰---^V------^â‹-------²----⁾-------^â‹---⁽--⁴---¹---⁰---^V------–-----⁽--²---⁷---⁰----^V-----^â‹--------²---⁾---⁾---^â‹---⁰---^,---⁹---⁵-- = 1, 58mH
4 ⋅ 25kHz ⋅ 60 W ⋅ 410V
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:
2
LC = ⁽---^V-----^I--^N-----^A-----^C----^M------_4I--^N--_â‹---_P-^â‹---_O----²-_U---⁾-_T----_P--^â‹--_F-^T---_CO-----^N-----^M------^A-----^X------^â‹---^η--
2
LC = ⁽---¹---⁸---⁰----^â‹--------²---⁾-------^â‹---²---³---^,---⁵---^µ----^s----^â‹---⁰---^,---⁹---⁵-- = 6, 03mH
4 ⋅ 60 W
With the assumed conditions the lowest value out of L_A, L_B, L_C is 1,58mH.
Selected value: L1= 1,58mH.
Preliminary Datasheet Version 1.02
33
March 2009