参数资料
| 型号： | IRPLDIM1U |
| 厂商： | International Rectifier |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | BALLAST DIMMING 32W/T8 120VAC |
| 标准包装： | 1 |
| 其它名称： | *IRPLDIM1U |
I ph
IRPLDIM1 Design
Line Input Voltage: 185 to 265VAC/50/60Hz
DC Bus Voltage: 400VDC
Lamp Power/Type: 36W/T8
1) Lamp Requirements
Typical high-frequency (25kHz) lamp require-
ments for the 36W/T8 lamp type are given as:
Variable Value Units
0.6 Arms
L
C
V ph
f ph
f ign
I ign
f p max
I Cath P min
[mH]
[nF]
[Vpp]
[kHz]
[kHz]
[App]
[kHz]
[Arms]
2.0
6.8
700
57
51
1.4
42
0.32
2.0
8.2
622
53
46
1.6
42
0.35
2.0
10
546
49
42
1.8
41
0.38
t ph
V ph max
V ign
P max
V P max
P min
V P min
I Cath min
1.0
600
1500
32
282
1
330
0.35
s
Vpp
Vpp
W
Vpp
W
Vpp
Arms
Table IV, Ballast parameters for different C values.
When compared against the lamp requirements,
a capacitor value of 6.8nF gives a lamp voltage
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
proper heating. Also, I Cath min is too low, which
will cause the lamp to extinguish at low light lev-
Table III, 36W/T8 lamp requirements
2) Iterate L and C to Fulfill Constraints
To select the ballast output stage inductor and
capacitor, a range of values were inserted into
equations (2) through (7), which have been sum-
marized in the following table:
www.irf.com
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 volt-
age for the pre-heat current to be increased and
the pre-heat time shortened. During dimming,
however, the lamp voltage increases with de-
creasing lamp power due to lamp negative in-
cremental 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-
heat the filaments. A capacitor value of 8.2nF
was chosen which fulfills the lamp requirements
without over-heating the cathodes.
11
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| IRPLDIM2E | KIT BALLAST DIM DIG 230VAC |
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