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FQPF9N50C データシート(PDF) 5 Page - Fairchild Semiconductor |
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FQPF9N50C データシート(HTML) 5 Page - Fairchild Semiconductor |
5 / 17 page AN-8027 © 2009 Fairchild Semiconductor Corporation www.fairchildsemi.com Rev. 1.0.0 • 8/26/09 5 Design Considerations In this section, a design procedure is presented using the schematic in Figure 11 as reference. A 300W PC power supply application with universal input range is selected as a design example. The design specifications are summarized in 0. The two-switch forward converter is used for DC/DC converter stage. Design Specifications Rated Voltage of Output 1 VOUT1 = 5V PWM Stage Efficiency ηPWM = 0.86 Rated Current of Output 1 IOUT1 = 9A Hold-up Time tHLD = 20ms Rated Voltage of Output 2 Vout2 = 12V Minimum PFC Output Voltage 310V Rated Current of Output 2 IOUT2 = 16.5A Nominal PFC output voltage VO_PFC = 387V Rated Voltage of Output 3 VOUT3 = -12V PFC Output Voltage Ripple 12VPP Rated Current of Output 3 IOUT3 = 0.8A PFC Inductor Ripple Current dI = 40% Rated Voltage of Output 4 VOUT4 = 3.3V AC Input Voltage Frequency fline = 50 ~ 60Hz Rated Current of Output 4 IOUT4 = 13.5A Switching Frequency fS = 65KHz Rated Output Power PO = 300W Total Harmonic Distortion α = 4% Line Voltage Range 85~264VAC Magnetic Flux Density ΔB = 0.27T Line Frequency 50Hz Current Density Dcma = 400C-m/A Brownout Protection Line Voltage 72VAC PWM Maximum Duty Cycle Dmax = 0.35 Overall Stage Efficiency η = 0.82 5V Output Current Ripple ILo1 = 44% 12V Output Current Ripple ILo2 = 10% D BOOST L BOOST Q1 C BOOST R CS1 C IF1 F1 IEA RAMP RT/CT FBPWM SS VRMS ISENSE IAC ILIMIT GND OPWM OPFC VD D VREF FBPFC VEA R FB2 RFB1 Q2 Q3 D R1 L 1 1 L 2 1 C O11 L 1 2 L22 V o1 V o2 V D D AC Input RRAMP FAN480X Drv R IAC Drv Drv C O12 C O21 C O22 D F1 D F2 D R2 V BOUT C FB C REF C DD C LF2 R LF2 R CS2 D R1 D R2 R RMS2 C RMS1 C RMS2 C LF1 C SS C T C RAMP R T R IC C IC1 C IC2 D1 D2 R RMS1 R RMS3 R B C VC2 C VC1 R VC C B V o1 V o2 R D R BIAS R OS1 R OS2 R OS3 R F C F R LF1 V o3 V o4 Figure 11. Reference Circuit for Design Example |
同様の部品番号 - FQPF9N50C |
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同様の説明 - FQPF9N50C |
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