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IR2159S Datasheet(PDF) 22 Page - International Rectifier

Part # IR2159S
Description  DIMMING BALLAST CONTROL IC
PDF  25 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IR2159S Datasheet(HTML) 22 Page - International Rectifier

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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:
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
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
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)
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
I
f
π
2
=
[Hz]
(3)
The resulting operating frequency during ignition
is given as:
LC
V
V
f
ign
DC
ign
π
π
4
1
2
1
+
=
[Hz]
(4)
The total load current during ignition is given as:
If
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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