ICB1FL03G Datasheet, PDF (30/38 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts

ICB1FL03G
Application Examples
control loop is completely integrated with a digital filter and error amplifier. PFC overcurrent is sensed by R18,
R19, Bus overvoltage and undervoltage at pin PFCVS. A bypass diode D11 between the DC side of the mains
rectifier and BUS capacitor is recommended in order to avoid an overload of the PFC MOSFET Q1.
7.2 Design Equations of a Ballast Application
Subsequent the design equations are listed:
Start-up resistors R11, R12:
R11 + R12
=
-^V-----^I--^N-----^M------^I--^N----
IVCCqu2
=
--²---⁰---⁰----^V-----
150 µ 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‹---_â‹^N---_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
=
-₁--₀---₀--²---^,â‹---⁵²---⁰_,---_5V---_µ----_A---
=
10kΩ
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, 5V
⋅
10
k
=
1630 k Ω
Selected values: R14= 820k; R15= 820k
Low pass capacitor C11:
Selected corner frequency f_C1= 10kHz.
C11 = -₂----_â‹---_π---¹--_â‹--^â‹-_f--_C⁽---^R--₁--²--_â‹-⁰--_R--+--₂---^R0----¹-_â‹--⁴-₍--_R--+--₁---^R4----¹-+--⁵---_R⁾----₁---₅---₎- = ₂-----_â‹---_π-----_â‹-¹--₁---₀^â‹---⁽_k--¹--_H-⁰----_zk----_â‹^+---₁--⁸-₀--²-_k--⁰---_â‹-^k--₍--₈^+---₂--⁸-₀--²--_k-⁰---+-^k---⁾-₈---₂---₀---_k----₎ = 1, 60nF
Selected value C3= 2,2nF
PFC Shunt resistors R18, R19:
Selected values: R18= 2,2Ohm; R19= 2,2Ohm
Set resistor R21 for run frequency, at a projected run frequency of 45kHz:
Preliminary Datasheet Version 1.02
30
March 2009