ICB1FL02G_08 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----_U-^R----_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‹----_⋅(--^V-_P---_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_------⋅_-------2_----)_------⋅_---(_---4_---1_---0_---V_{------–-----}(_--1_---8_---0_----V_-----⋅_--------2_---)_---)_---⋅_---0_---,_---9_---5_--
4 ⋅ 25kHz ⋅ 60 W ⋅ 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_------⋅_--------2_---)_-------⋅_---(_--4_---1_---0_---V_{------–-----}(_--2_---7_---0_----V_------⋅_-------2_---)_---)_---⋅_---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:
2
LC = ⁽---^V----^I---^N-----^A-----^C----^M------_4I--^N--_â‹---_P-^â‹---_O----²-_U---⁾-_T-----_P-^â‹--_F-^T---_C-^O----^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.
Datasheet Version 2.1
33
September 2008