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IR2159 Datasheet(PDF) 23 Page - International Rectifier

Part No. IR2159
Description  DIMMING BALLAST CONTROL IC
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Maker  IRF [International Rectifier]
Homepage  http://www.irf.com
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IR2159 Datasheet(HTML) 23 Page - International Rectifier

 
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IR2159/IR21591 (S)
www.irf.com
23
The operating frequency [Hz] at maximum lamp
power is given as:
The cathode heating current at minimum lamp
power is given as:
2
%
1
%
1
%
1
C
f
V
I
Cath
π
=
(7)
Design Constraints
The inductor and capacitor values should be
iterated until the following design constraints have
been fulfilled (Table II).
Design Constraint
Reason
VV
ph
ph
<
max
Ignition during pre-
heat
ff
kHz
ph
ign
−> 5
Production tolerances
II
ign
ign
<
max
Inductor saturation
min
%
1
Cath
Cath
I
I
Lamp
extinguishing
during dimming
Table II, Ballast design constraints
IR2159 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:
]
4
2
)
2
2
[(
tan
180
3
%
3
2
%
2
%
%
2
%
%
%
2
%
1
%
f
LC
P
V
f
L
V
P
C
P
V
π
π
π
ϕ
=
(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 IR2159 are obtained with the following
equations:
)
14
2
(
)
10000
(
)
10
1
(
)
10000
(
)
6
25
(
=
e
f
e
f
e
R
MIN
MIN
FMIN
[Ohms]
(10)
ign
CS
I
R
)
6
.
1
(
2
=
[Ohms]
(11)
2
ph
CS
FMIN
IPH
I
R
R
R
=
[Ohms]
(12)
 −
=
45
1
4
%
1
ϕ
FMIN
MIN
R
R
[Ohms]
(14)
[Ohms]
(15)
 −
=
45
1
4
%
100
ϕ
FMIN
MIN
MIN
FMIN
MAX
R
R
R
R
R
2
2
2
%
100
2
4
%
100
2
2
%
100
4
%
100
2
2
%
100
%
100
4
1
32
1
32
1
2
1
C
L
V
V
V
C
P
LC
V
C
P
LC
f
DC 

+
=
π
π
(6)
2
2
2
%
2
4
%
2
2
%
4
%
2
2
%
%
4
1
32
1
32
1
2
1
C
L
V
V
V
C
P
LC
V
C
P
LC
f
DC 

+
=
π
π
(8)
)
)(
7
6
.
2
(
PH
CPH
t
E
C
=
[Farads]
(13)


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