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## IRS2168DPBF Datasheet(PDF) 18 Page - International Rectifier

 Part No. IRS2168DPBF Description ADVANCED PFC BALLAST CONTROL IC Download 21 Pages Scroll/Zoom 100% Maker IRF [International Rectifier] Homepage http://www.irf.com Logo

## IRS2168DPBF Datasheet(HTML) 18 Page - International Rectifier

 18 / 21 page IRS2168D(S)PbFwww.irf.comPage 18IV. PFC Design EquationsStep1: Calculate PFC inductor value:OUTRMSRMSPFCPVACVACVBUSeL⋅⋅⋅⋅−⋅−=22)2()68(η[H](1)where,VBUS= DC bus voltageRMSVAC= Nominal rms AC input voltageη= PFC efficiency (typically 0.95)OUTP= Ballast output powerStep 2: Calculate peak PFC inductor current:η⋅⋅⋅=MINOUTPKVACPi22[A] (peak)(2)where,MINVAC= Minimum rms AC input voltageNote: The PFC inductor must not saturate atPKiover 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:PKOCiR2.1=[Ω](3)Step 4: Calculate start-up resistor RVCC value:IQCCUVVACRPKMINVCC10+=[Ω](4)

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