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IRPLHID2 Datasheet(PDF) 20 Page - International Rectifier

Part # IRPLHID2
Description  HID Ballast for 70W Lamp Using the IRS2573D
PDF  30 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IRPLHID2 Datasheet(HTML) 20 Page - International Rectifier

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1
- 20 -
6
.
0
2
2
.
1
,
A
V
I
V
R
PEAK
OC
CS
BCS
(8)
 Buck inductor value
Select input voltage for the buck, which is the bus voltage provided by boost PFC
stage:
V
V
BUS
400
Select nominal frequency of the buck:
kHz
f
70
Calculate buck inductor value based on nominal frequency, lamp current, buck input
and output voltage:
H
V
V
V
I
T
L
OUT
BUS
OUT
LAMP
733
1
2


(9)
where
f
T
1
and
LAMP
OUT
V
V
Buck inductor selection value:
H
L
750
 Buck off-time programming capacitor
Determine buck output minimum voltage (lamp minimum voltage after ignition):
)
(
20
,
typical
V
V
MIN
OUT
Calculate buck minimum frequency in the boundary between critical- and continuous-
conduction mode:
kHz
e
V
V
V
L
I
f
BUS
MIN
OUT
MIN
OUT
PEAK
OC
MIN
13
400
20
20
6
750
1
2
1
1
2
2
,
,
,


(10)



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