IRS2168 International Rectifier Corp., IRS2168 Datasheet - Page 18

• Manufacturer Part Number: IRS2168
• Description: Advanced Pfc And Ballast Control Ic In A 16-lead Soic Package
• Manufacturer: International Rectifier Corp.

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