IRS2500 IRF [International Rectifier], IRS2500 Datasheet - Page 16

• Manufacturer Part Number: IRS2500
• Description: TRANSITION MODE PFC CONTROL IC
• Manufacturer: IRF [International Rectifier]

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PFC Design Equations (for Boost Converter)
Step1: Calculate PFC inductor value:
Step 2: Calculate peak PFC inductor current:
Step 3: Calculate PFC over-current resistor ROC value:
Step 4: Calculate start-up resistor RVCC value:
i
R
where,
η
Note: The PFC inductor must not saturate at
and air-gapping should be considered in the inductor design.
VBUS
VAC
L
P
PK
f
R
OC
OUT
MIN
PFC
VCC
=
=
MIN
=
VOCTH
2
VAC
=
⋅
(
i
VAC
VBUS
PK
2
=
=
=
=
=
IQCCUV
MIN
⋅
P
MIN
Minimum rms AC input voltage
DC bus voltage
PFC efficiency (typically 0.95)
Minimum PFC switching frequency at minimum AC input voltage
Ballast output power
OUT
2
⋅
−
η
⋅
PK
f
MIN
where VOCTH = 1.1V
2
+
⋅
10
VAC
⋅
P
OUT
MIN
⋅
VBUS
)
⋅
VAC
i
PK
MIN
2
over the specified ballast operating temperature range. Proper core sizing
⋅
η
16
[Amps Peak]
[Ohms]
[Henries]
[Ohms]
(4)
(2)
(3)
(1)
© 2012 International Rectifier
IRS2500S