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IRS2168DPBF Datasheet(PDF) 18 Page - International Rectifier

Part No. IRS2168DPBF
Description  ADVANCED PFC BALLAST CONTROL IC
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Maker  IRF [International Rectifier]
Homepage  http://www.irf.com
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IRS2168DPBF Datasheet(HTML) 18 Page - International Rectifier

 
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IRS2168D(S)PbF
www.irf.com
Page 18
IV. PFC Design Equations
Step1: Calculate PFC inductor value:
OUT
RMS
RMS
PFC
P
VAC
VAC
VBUS
e
L
=
2
2
)
2
(
)
6
8
(
η
[H]
(1)
where,
VBUS
= DC bus voltage
RMS
VAC
= Nominal rms AC input voltage
η
= PFC efficiency (typically 0.95)
OUT
P
= Ballast output power
Step 2: Calculate peak PFC inductor current:
η
=
MIN
OUT
PK
VAC
P
i
2
2
[A] (peak)
(2)
where,
MIN
VAC
= Minimum rms AC input voltage
Note: The PFC inductor must not saturate at
PK
i
over the specified ballast operating temperature range.
Proper core sizing and air-gapping should be considered in the inductor design.
Step 3: Calculate PFC over-current resistor ROC value:
PK
OC
i
R
2
.
1
=
[
]
(3)
Step 4: Calculate start-up resistor RVCC value:
IQCCUV
VAC
R
PK
MIN
VCC
10
+
=
[
]
(4)


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