ICB1FL02G_08 INFINEON [Infineon Technologies AG], ICB1FL02G_08 Datasheet - Page 32

• Manufacturer Part Number: ICB1FL02G_08
• Description: Smart Ballast Control IC for Fluorescent Lamp Ballasts
• Manufacturer: INFINEON [Infineon Technologies AG]

Lamp voltage sense resistors R31, R32, R33:
The selected lamp type 54W-T5 has a typical run voltage of 167V peak. We decide to set the EOL-thresholds at
a level of 1,5 times the run voltage level (= 250,5V peak).
Selected values: R31= 390k; R32= 390k; R33= 390k (=1170k).
Current source resistors R34, R35 for detection of high-side filament:
Selected values: R34= 2,2M; R35= 2,2M;
Current limitation resistor R30 for floating bootstrap capacitor C14:
A factor of 2 is provided in order to keep current level significant below LSCS turn-off threshold.
Selected value: R30= 10Ohm.
Low-side filament sense resistor R36:
For a single lamp ballast
Selected value: R36= 56k
Selected values in a topology with 2 lamps in parallel: R36A= 110k; R36B= 110k.
Low pass filter capacitor C19:
Capacitor C19 provides a low pass filter together with resistor R36 in order to suppress AC voltage drop at the
low-side filament. When we estimate an AC voltage of 10V peak-to-peak at low-side filament during run mode at
f
Selected value for better ripple suppression: C19= 22nF.
Datasheet Version 2.1
RUN
= 40kHz, we need a suppression of at least a factor F
R
34
+
R
35
R
C
30
=
19
≥
-------------------------------------------- -
I
R
LVSSINKMAX
--------------------------------- -
V
=
2 V
31
LSCSOVC
⋅
R
V
------------------------------------------------- -
(
+
36A
R
INMIN
2 π f
CCON
R
36
⋅
32
≥
≤
⋅
F
+
V
---------------------------------------
V
------------------------------------ -
2
LP
RUN
I
I
R
RESC1MAX
RESC1MIN
RES3MIN
RES3MAX
⋅
33
–
--------------------------
R
R
1
24
24
–
⋅
=
R
(
+
R
⋅
-------------------------- -
I
36
LVSEOL
R
V
31
R
25
)
25
LEOL
+
=
32
R
=
=
=
32
LP
-------------------------------------------------- -
(
2 14V
----------------- -
------------------- -
27 0µA
2 π 40kHz 56k
1 6V
1 55V
------------------- -
15 1µA
= 100 (-40dB).
+
⋅
1 65V
,
,
,
⋅
=
,
,
R
33
250 5V
-------------------
⋅
100
215µA
)
⋅
,
----------------------------- -
0 82
0 82
2
=
=
,
=
,
–
57 4kΩ
------------- -
26µA
200V
109 3kΩ
1
⋅
+
,
=
⋅
0 82
0 82
,
1165kΩ
,
,
–
)
(
=
1170k
=
7 1nF
Application Examples
7 18Ω
,
,
)
=
6522kΩ
September 2008
ICB1FL02G