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IRS2500S Datasheet(PDF) 16 Page - International Rectifier

Part # IRS2500S
Description  TRANSITION MODE PFC CONTROL IC
PDF  22 Pages
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Manufacturer  IRF [International Rectifier]
Direct Link  http://www.irf.com
Logo IRF - International Rectifier

IRS2500S Datasheet(HTML) 16 Page - International Rectifier

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IRS2500S
www.irf.com
© 2012 International Rectifier
16
PFC Design Equations (for Boost Converter)
Step1: Calculate PFC inductor value:
VBUS
P
f
VAC
VAC
VBUS
L
OUT
MIN
MIN
MIN
PFC
⋅
⋅
⋅
⋅
⋅
⋅
−
=
2
)
2
(
2
η
[Henries]
(1)
where,
VBUS
= DC bus voltage
MIN
VAC
= Minimum rms AC input voltage
η
= PFC efficiency (typically 0.95)
MIN
f
= Minimum PFC switching frequency at minimum AC input voltage
OUT
P
= Ballast output power
Step 2: Calculate peak PFC inductor current:
η
⋅
⋅
⋅
=
MIN
OUT
PK
VAC
P
i
2
2
[Amps Peak]
(2)
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
VOCTH
R
=
where VOCTH = 1.1V
[Ohms]
(3)
Step 4: Calculate start-up resistor RVCC value:
IQCCUV
VAC
R
PK
MIN
VCC
10
+
=
[Ohms]
(4)



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