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参数资料
| 型号： | IR21593S |
| 厂商： | International Rectifier |
| 英文描述： | DIMMING BALLAST CONTROL IC |
| 中文描述： | 调光镇流器控制IC |
| 文件页数： | 22/25页 |
| 文件大小： | 259K |
| 代理商： | IR21593S |
IR21592/IR21593
(S)
22
www.irf.com
The operating frequency [Hz] at maximum lamp
power is given as:
The cathode heating current at minimum lamp
power is given as:
π
=
2
%
1
%
1
%
1
C
f
V
I
Cath
(7)
Design Constraints
The inductor and capacitor values should be
iterated until the following design constraints have
been fulfilled (Table II).
Design Constraint
V
V
ph
<
Reason
ph
max
Ignition during pre-
heat
Production tolerances
f
f
kHz
ph
ign
<
≥
>
5
I
I
ign
ign
I
max
Inductor saturation
Lamp extinguishing
during dimming
min
%
1
Cath
Cath
I
Table II, Ballast design constraints
IR21592/IR21593 Programmable Inputs
In order to program the MIN and MAX settings of
the dimming interface, the phase of the output
stage current at minimum and maximum lamp
power must be calculated. This is obtained using
the following equations:
2
2
2
%
100
C
2
4
%
100
V
2
2
%
100
P
4
%
100
V
2
2
%
100
P
%
100
f
4
1
32
C
1
32
C
1
2
1
π
L
V
V
LC
LC
DC
π
+
=
(6)
Ballast Output Stage
The components comprising the output stage are
selected using a set of equations. Different ballast
operating frequencies and their respective
voltages and currents are calculated.
The inductor and capacitor values are obtained
using equations (2) through (7). The results of
these equations reveal the location of each
operating frequency and the corresponding
voltages and currents. For a given L, C, DC bus
voltage, and pre-heat current, the resulting voltage
over the lamp during pre-heat is given as:
The resulting operating frequency during pre-heat
is given as:
ph
ph
ph
CV
π
I
f
2
=
[Hz]
(3)
The resulting operating frequency during ignition
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)
π
π
DC
ph
DC
ph
V
I
C
L
V
V
2
8
2
2
1
2
2
+
=
(2)
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