|
ICB1FL01G Datasheet, PDF (30/38 Pages) Infineon Technologies AG – Smart Ballast Control IC for Fluorescent Lamp Ballasts | |||
|
◁ |
ICB1FL01G
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, 33Mâ¦
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.
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--3-6--1-2---â
-â
--2-1-- = 39kâ¦
Selected value: R13= 33k.
PFC Voltage sense resistor R20
Selected value: R20= 10k
R20 ⤠1---0---0-----â
---VI--P--R--F---E-C---F-B-----I--A-----S-- = -1--0---0--2---,â
---52---0,---5V---µ----A--- = 10kâ¦
PFC Voltage sense resistors R14, R15
R14 + R15
=
V-----B----U-----S-----â-----V----R-----E----F--
VREF
â
R20
=
-4--1---0----V---2---â,---5-(--V-2---,---5---V-----) â
10k
=
1630 k â¦
Selected values: R14= 820k; R15= 820k
Low pass capacitor C11
Selected corner frequency fC1= 10kHz.
C11 = -2----â
---Ï---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
---Ï-----â
-1--1---0â
---(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 40kHz
Selected value: R21= 12,4k
Preliminary Datasheet Version 1.5
30
June 2005
|
▷ |