IR2159 International Rectifier, IR2159 Datasheet - Page 23

• Manufacturer Part Number: IR2159
• Description: IC BALLAST CONTROL DIM 16-DIP
• Manufacturer: International Rectifier
• Type: Ballast Controllerr

Specifications of IR2159

• Frequency: 25 ~ 95 kHz
• Current - Supply: 10mA
• Voltage - Supply: 12.5 V ~ 15.6 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output: -

The cathode heating current at minimum lamp
power is given as:
www.irf.com
Design Constraints
The inductor and capacitor values should be
iterated until the following design constraints have
been fulfilled (Table II).
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:
The operating frequency [Hz] at maximum lamp
power is given as:
f
100
%
I
Cath
2
f
I
1
IR2159 Programmable Inputs
ph
Design Constraint
Cath
V
1
I
%
ign
ph
LC
1
Table II, Ballast design constraints
1
%
f
ign
V
C
I
32
V
ign
I
2
ph
1
V
P
Cath
%
100
100
2
max
4
max
5
%
%
kHz
f
min
1
2
%
LC
C
1
Ignition during pre-
heat
Production tolerances
Inductor saturation
Lamp
during dimming
C
32
2
V
P
100
100
2
4
%
%
Reason
extinguishing
2
1
L
V
4
2
100
C
V
DC
%
2
2
(7)
(6)
R
C
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:
R
f
R
R
R
%
%
CS
IPH
CPH
FMIN
MAX
MIN
2
1
180
2
tan
LC
R
2 (
1
I
R
4
(
. 1 (
ign
FMIN
25
1
6 .
FMIN
[(
IR2159/IR21591
4
) 6
R
32
C
2
e
V
E
P
MIN
2
%
V
2
R
P
%
(
. 0
%
%
2
4
C
CS
f
) 6
1
86
MIN
7
I
)(
2
V
ph
R
P
%
t
LC
%
2
(
R
45
1
PH
FMIN
1
f
L
10000
%
FMIN
MIN
2 )
2
)
C
32
f
%
2
V
P
%
%
1
2
10000
4
R
)
4
[Ohms]
2
[Ohms]
[Ohms]
[Farads]
[Ohms]
MIN
V
[Ohms]
P
2 (
%
%
2
1
LC
e
100
45
)
2
L
%
4
V
2
14
C
3
1 (
V
%
f
DC
2
%
e
3
)
]
2
( S )
(10)
(11)
(14)
10
(15)
(13)
(12)
(9)
(8)
23
)