ICB1FL02G_08 Datasheet, PDF (30/37 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

ICB1FL02G
7.2 Design Equations of a Ballast Application
Subsequent the design equations are listed:
Start-up resistors R11, R12:
Application Examples
R11 + R12
=
-^V-----^I--^N-----^M------^I--^N----
IVCCqu2
=
1^--2-5^--0-0^--0--µ^--V--A^---
=
1, 33MΩ
Selected value: R11= 470k; R12= 470k
Current limitation resistor R13 of PFC zero current detector (PFCZCD).
The additional factor 2 is used in order to keep away from limit value.
Selected value: R13= 33k.
R13 = _I---_P----_F-^V--_C--^B---_Z--^U--_C--^S--_D---^â‹---^N_â‹---_N--^S---_P-^E---_R-^C---_I--^â‹_M---²----_â‹---₁-- = ₄--⁴--_m-¹---⁰-_A--^V----_â‹--^â‹-₁--¹-₂--³-₈---^â‹-_â‹--²-₁-- = 20, 8kΩ
PFC Voltage sense resistor R20:
Selected value: R20= 10k.
R20
≤
--------------^V----^R-----^E----^F---------------
100 ⋅ IPFCBIAS
=
--------²---^,---⁵---⁰---^V----------
100 ⋅ 2, 5µA
=
10k Ω
PFC Voltage sense resistors R14, R15:
R14 + R15
=
-^V----^B----^U-----^S-----–-----^V----^R-----^E----^F--
VREF
⋅
R20
=
4_---1_---0_----V_{---2---–,---5-}(_--V-2_---,_---5_---V_-----) _{⋅ 10k}
=
1630kΩ
Selected values: R14= 820k; R15= 820k
Low pass capacitor C11:
Selected corner frequency f_C1= 10kHz.
C11
=
-----------¹----^â‹---⁽--^R-----²---⁰----+-----^R----¹---⁴-----+-----^R----¹---⁵---⁾-----------
2 ⋅ π ⋅ fC1 ⋅ R20 ⋅ (R14 + R15)
=
--------------¹-----^â‹---⁽--¹---⁰----^k----+-----⁸---²---⁰----^k----+-----⁸---²---⁰----^k---⁾--------------
2 ⋅ π ⋅ 10kHz ⋅ 10k ⋅ (820k + 820k)
=
1, 60nF
Selected value C3= 2,2nF
PFC Shunt resistors R18, R19:
-^R-----¹---⁸----^â‹---^R----¹---⁹--- = ^V-----^P----^F----^C----^C-----^S---^O-----^F----^F-----^â‹---^η-----^â‹---^V-----^I--^N-----^A-----^C----^M------^I--^N------^â‹-------²-- = ¹----^V------^â‹---⁰---^,---⁹---⁵----^â‹---¹---⁸---⁰----^V-----^â‹--------²- = 1, 1 Ω
R18 + R19
4 ⋅ POUTPFC
4 ⋅ 55W
Selected values: R18= 2,2Ohm; R19= 2,2Ohm
Datasheet Version 2.1
30
September 2008