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IR2159 Datasheet(PDF) 22 Page - International Rectifier

Part No. IR2159
Description  DIMMING BALLAST CONTROL IC
Download  25 Pages
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Maker  IRF [International Rectifier]
Homepage  http://www.irf.com
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IR2159 Datasheet(HTML) 22 Page - International Rectifier

 
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IR2159/IR21591 (S)
22
www.irf.com
Should the peak voltage on pin CS exceed 1.6V
at any time during dimming, the IR2159 enters
FAULT mode and the high and low-side driver
outputs, HO and LO, are both turned off . Cycling
the supply voltage on VCC below or the voltage
on pin SD will reset the IR2159 to preheat (PH)
mode (see STATE DIAGRAM).
Ballast Design
Lamp Requirements
Before selecting component values for the ballast
output stage and the programmable inputs of the
IR2159, the following lamp requirements must first
be defined:
Variable
Description
Units
ph
I
Filament pre-heat current
Arms
ph
t
Filament pre-heat time
s
max
ph
V
Maximum lamp pre-heat voltage
Vpp
ign
V
Lamp ignition voltage
Vpp
%
100
P
Lamp power at 100% brightness
W
%
100
V
Lamp voltage at 100% brightness
Vpp
%
1
P
Lamp power at 1% brightness
W
%
1
V
Lamp voltage at 1% brightness
Vpp
min
Cath
I
Minimum cathode heating current
Arms
Table I, Typical lamp requirements
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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