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參數(shù)資料
| 型號： | IRPLDIM1U |
| 廠商： | International Rectifier |
| 英文描述： | Dimming Ballast Control IC Design Kit |
| 中文描述： | 調(diào)光鎮(zhèn)流器控制IC設(shè)計工具包 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 209K |
| 代理商： | IRPLDIM1U |
7
www.irf.com
Ballast Design
Lamp Requirements
Before selecting component values for the bal-
last output stage and the programmable inputs
of the IR21592, the following lamp requirements
must first be defined:
Table I, Typical lamp requirements
Ballast Output Stage
The components comprising the output stage
are selected using a set of equations. Different
ballast operating frequencies and their respec-
tive voltages and currents are calculated. The
inductor and capacitor values are obtained us-
ing equations (2) through (7). The results of
these equations reveal the location of each
operating frequency and the corresponding volt-
ages and currents. For a given L, C, DC bus
voltage, and pre-heat current, the resulting volt-
age over the lamp during pre-heat is given as:
π
π
DC
ph
DC
ph
V
I
C
L
V
V
+
=
2
2
8
[Vpp]
(2)
The resulting operating frequency during pre-
heat is given as:
ph
ph
ph
CV
I
f
π
2
=
[Hz]
(3)
The resulting operating frequency during igni-
tion is given as:
LC
V
V
f
ign
DC
ign
π
π
2
4
1
1
+
=
[Hz]
(4)
The total load current during ignition is given
as:
I
f
CV
ign
ign
ign
=
2
π
[App]
(5)
The operating frequency [Hz] at maximum lamp
power is given as:
(6)
The cathode heating current at minimum lamp
power is given as:
C
f
V
I
Cath
=
2
%
1
%
1
%
1
π
(7)
Design Constraints
The inductor and capacitor values should be it-
erated until the following design constraints have
been fulfilled (Table II).
Table II, Ballast design constraints
2
2
2
%
100
C
L
2
4
%
100
2
2
%
100
V
4
%
100
2
2
%
100
V
%
100
4
1
4
32
C
1
32
C
1
2
1
π
V
V
P
LC
P
LC
f
DC
+
=
π
Variable
I
Description
Units
Arms
ph
Filament pre-heat current
ph
t
Filament pre-heat time
s
max
ph
V
V
Maximum lamp pre-heat voltage
Vpp
ign
Lamp ignition voltage
Vpp
%
100
P
V
Lamp power at 100% brightness
W
%
100
Lamp voltage at 100% brightness
Vpp
%
1
P
Lamp power at 1% brightness
W
%
1
V
I
Lamp voltage at 1% brightness
Vpp
min
Cath
Minimum cathode heating current
Arms
Design Constraint
V
V
ph
<
f
ph
ign
I
I
ign
<
≥
Reason
ph
>
5
max
kHz
Ignition during pre-heat
f
Production tolerances
ign
I
max
Inductor saturation
min
%
1
Cath
Cath
I
Lamp extinguishing during
dimming
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