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AN-6027 Datasheet(PDF) 6 Page - Fairchild Semiconductor |
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AN-6027 Datasheet(HTML) 6 Page - Fairchild Semiconductor |
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6 / 16 page  AN6027 APPLICATION NOTE © 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0. 3 • 1/11/07 6 leading current, which causes phase difference between the line current and the line voltage. The phase difference increases as the capacitance of the input capacitor increases. Therefore, the input capacitor must be smaller than Cin(max) calculated by Equation 12. Cin(max) is the sum of all the capacitors connected at the input side. Figure 11. Input Voltage and Current Displacement Due to Input Filter Capacitance 4) Output Capacitor Design The output capacitor is selected by the relationship between the input and output power. As shown in Figure 13, the min- imum output capacitance is determined by Equation 14. Figure 12. PFC Configuration Figure 13. Diode Current and Output Voltage Waveform 5) MOSFET and Diode Selection The maximum MOSFET RMS current is obtained by Equa- tion 15 and the conduction loss of the MOSFET is calculated by Equation 16. When MOSFET turns on, the MOSFET cur- rent rises from zero, so the turn-on loss is negligible. The MOSFET turn-off loss and the MOSFET discharge loss are obtained by Equations 17 and 18, respectively. The switch- ing frequency of the critical conduction mode boost PFC converter varies according to the line and load conditions. () cos( ) (9) a A in peak VV V t ω == () cos( ) cos( ) sin( ) (10) aa A a c a in in peak iI t ii i I t C V t ω ωω ω = =+ = − ⋅ ⋅ () () () 1 1 (max) () 1 2 (_ max) tan (11) tan cos ( ) 2 tan cos ( ) (12) in in peak a a in in peak oo in peak CV I I CIDF V VI IDF V ω θ ω ω − − − ⋅⋅ ⎛⎞ = ⎜⎟ ⎜⎟ ⎝⎠ = ⋅ ⋅⋅ = ⋅ PFC Circuit + − + − Input Filter Re Im θ V A i A i a i C V A V a i C i a L in C in i A PFC + − + − I IN I D I O V IN C O V O () () () =⋅ ⋅ − = ⋅ =− =⋅ − () () () () 1cos(2 ) 1cos(2 ) 1 cos(2 ) (13) in in rms in rms D o in rms in rms D o o PI V t I V IV It V It ω ω ω D(avg) O I = I (1- cos(2ωt)) O O O I Δ V= ω C V O I O (max) (min) (max) (14) 2 o o ac o I C fV π ≥ ⋅⋅ Δ |
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