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FFP08H60S Datasheet(PDF) 1 Page - Fairchild Semiconductor |
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FFP08H60S Datasheet(HTML) 1 Page - Fairchild Semiconductor |
1 / 15 page www.fairchildsemi.com © 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.0 • 6/8/10 AN-6982 Power Factor Correction Converter Design with FAN6982 Introduction The FAN6982 is a 14-pin, Continuous Conduction Mode (CCM) Power Factor Correction (PFC) controller IC, that employs leading-edge modulation for average current control and has a number of advanced features for better performance and reliability. The variable output voltage function (range function) reduces PFC output voltage at light-load and low-line conditions to improve light-load efficiency, but can be also easily disabled using EN pin. The RDY signal can be used for power-on sequence control of the downstream DC/DC converter. A TriFault Detect™ function helps reduce external components and provides full protection for feedback loops such as open, short, and over voltage. FAN6982 also includes PFC soft- start, peak current limiting, line feed-forward, and input voltage brownout protection. This application note describes the theory of operation and step-by-step design considerations for a power factor correction power supply using the FAN6982 controller. A typical application circuit is shown in Figure 1, where the supply voltage, VDD, is supplied from a standby auxiliary power supply and the supply voltage for the downstream converter is controlled by the RDY pin. IEA RT/CT RDY EN VRMS ISENSE IAC SGND OPFC PGND VDD VREF FBPFC VEA FAN6982 Range Enabled/Disabled VEN =VVREF : Enabled VEN = GND : Disabled AC Input F1 CIF2 LBOOST DBOOST CBOOST Q1 RCS RRMS1 RRMS2 RRMS3 CRMS1 CRMS2 RLF CLF RIAC RIC CIC1 CIC2 D1 D2 RDRV RPL CDD RFB2 CFB RFB1 RVC CVC1 CVC2 RT CT CREF REN CRDY vCC VBOUT Downstream DC/DC Converter PWM Controller Q2 Rreg1 Rreg2 Rreg3 VOUT From Standby Auxiliary Power Supply CIF1 Figure 1. Typical FAN6982 Application Circuit |
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