IRPLDIM1U データシートの表示（PDF） - International Rectifier
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IRPLDIM1U Datasheet PDF : 12 Pages
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IR2159 Programmable Inputs
In order to program the MIN and MAX settings
of the dimming interface, the phase of the out-
put stage current at minimum and maximum
lamp power must be calculated. This is obtained
using the following equations:
f%
=
1
2π
1 − 32P%2 +
LC C2V%4
L1C−
32P%2
C2V%4
2
−
41−
4VDC
V%π
L2C2
2
(8)
ϕ%
=
180tan−1[(V%2
π
2P%
C−
2P%
V%2
L)2πf%
−4V%2
P%
LC2π3
f%3]
(9)
With the lamp requirements defined, the L and
C of the ballast output stage selected, and the
minimum and maximum phase calculated, the
component values for setting the programmable
inputs of the IR21592 are obtained with the fol-
lowing equations:
RFMIN
=
(25e − 6) − ( fMIN −10000) ⋅ (1e −10)
( fMIN −10000) ⋅ (2e −14)
[Ohms] (10)
RCS
=
2⋅ (1.6)
I ign
[Ohms] (11)
RIPH = RFMINRCS I ph 2 [Ohms] (12)
CCPH = (2E − 7)(tPH )
[Farads] (13)
R MIN
=
R FMIN
4
1 − ϕ1%
45
[Ohms] (14)
RMAX
=
0.86 ⋅ RFMIN ⋅ RMIN
4⋅
RMIN
−
RFMIN
⋅ 1−
ϕ100%
45
[Ohms]
(15)
8
This ballast design procedure has been sum-
marized into the following 3 steps:
Define
Lamp
Requirements
Calculate IR2159
Programmable
Inputs
Iterate L and C
to fulfill
constraints
Figure 3, Simplified Ballast Design Procedure
Ballast Designer Software
Included with the design kit is the Ballast Designer
Software which allows for selection of different
lamp types, different input voltage ranges or dif-
ferent lamp configurations. The software then
performes all of the necessary design iterations
and generates new schematics and a bill of ma-
terials.
IRPLDIM1U Design
Line Input Voltage: 90 to 140VAC/50/60Hz
Lamp Power/Type: 32W/T8
1) Lamp Requirements
Typical high-frequency (25kHz) lamp require-
ments for the 32W/T8 lamp type are given as:
Variable
I ph
t ph
V phmax
Vign
Pmax
VPmax
Pmin
VPmin
I Cathmin
Value
0.6
1.0
600
1300
30
400
1
330
0.35
Units
Arms
s
Vpp
Vpp
W
Vpp
W
Vpp
Arms
Table III, 32W/T8 lamp requirements
www.irf.com
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