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2) Iterate L and C to Fulfill Constraints
To select the ballast output stage inductor and
capacitor, a range of values were input into
equations (2) through (7), which have been sum-
marized in the following table:
heat the filaments. A capacitor value of 8.2nF
was chosen which fulfills the lamp requirements
without over-heating the cathodes.
3) IR21592 Programmable Inputs
With all of the lamp requirements fulfilled, the
f 100 %
f 1 %
L
C
V ph
f ph
[mH]
[nF]
[Vpp]
[kHz]
2.0
6.8
748
53
2.0
8.2
668
49
2.0
10
592
46
component values for setting the programmable
inputs of the IR21592 are calculated as:
Equation No. Variable Value
(8) 46kHz
(8) 58kHz
f ign
I ign
f p max
I Cath P min
[kHz]
[App]
[kHz]
[Arms]
49
1.4
49
0.32
45
1.5
46
0.35
40
1.7
43
0.38
(9)
(9)
(10)
(11)
(12)
? 100 %
? 1 %
R FMIN
R CS
R IPH
-56.12deg
-89.27deg
36kOhm
1.0 Ohm
22kOhm
Table IV, Ballast parameters for different C values
When compared against the lamp requirements,
a capacitor value of 6.8nF gives a lamp voltage
(13)
(14)
(15)
C TPH
R MIN
R MAX
330nF
27kOhm
24kOhm
proper heating. Also, I Cath
will cause the lamp to extinguish at low light lev-
during pre-heat that exceeds the maximum al-
lowable specified for this lamp type. This can
ignite the lamp before the cathodes have
reached their emission temperature, drastically
reducing lamp life. The pre-heat current can
be reduced to give a lower pre-heat voltage, but
the pre-heat time must then be increased for
is too low, which
min
els where the arc current alone is too low to
heat the cathodes. Increasing the capacitor
value to 10nF fulfills the lamp requirements quite
well, even allowing some room in the pre-heat
voltage for the pre-heat current to be increased
and the pre-heat time shortened. During dim-
ming, however, the lamp voltage increases with
decreasing lamp power due to lamp negative
incremental impedance effects. A maximum is
reached around 10% brightness, after which the
lamp voltage decreases as the lamp is further
dimmed. The maximum filament current occurs
at the maximum lamp voltage, which for a ca-
pacitor value of 10nF, is too high and will over-
10
Table V, IR21592 Programmable Inputs for T8/32W lamp.
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