反激式开关电源变压器设计—Fairchild_资料

By Choi Blue cell is the input parameters

Red cell is the output parameters

6. Determine the numner of turns for each outputs

Vo VF # of turns

FPS Design Assistant ver.1.0

Vcc (Use Vcc start voltage)

1st output for feedback

2nd output

3rd output

4th output

5th output

6th output

AL value (no gap)

2Gap length (center pole gap)=

7. Determine proper wire for each output Parallel Irms (A/mm 2)Primary winding

0.5mm 1T 0.7A Vcc winding

0.3mm 1T 0.1A 1st output winding

0.4mm 4T 3.4A 2nd output winding

0.4mm 4T 0.0A 3rd output winding

mm T #DIV/0!A 4th output winding

mm T #DIV/0!A 5th output winding

mm T #DIV/0!A 6th output winding

mm T #DIV/0!A Copper area =

5.6584mm 2Fill factor

0.2Required window area 28.292mm 28. Determine the rectifier diodes in the secondary side

9. Determine the output capacitor

ESR Current Voltage ripple Ripple 1st output capacitor

1000uF 50mΩ 2.7V 0.3V 2nd output capacitor

1000uF 40mΩ0.0V 0.0V 3rd output capacitor

uF mΩ#DIV/0!V #DIV/0!V 4th output capacitor

uF mΩ#DIV/0!V #DIV/0!V 5th output capacitor

uF mΩ#DIV/0!V #DIV/0!V 6th output capacitor

uF mΩ#DIV/0!V #DIV/0!V Capacitance

#DIV/0!

#DIV/0!#DIV/0!6.70.0#DIV/0!Diameter 3.51.4

(In Normal Operation)

11. Design Feedback control loop

Control-to-output DC gain =Control-to-output zero =Control-to-output RHP zero =Control-to-output pole =Voltage divider resistor (R1)

Voltage divider resistor (R2)

Opto coupler diode resistor (RD)

431 Bias resistor (Rbias)

Feeback pin capacitor (CB) =

Feedback Capacitor (CF) =

Feedback resistor (RF) =

Feedback integrator gain (fi) =

Feedback zero (fz) =

Feedback pole (fp) =

最大AC电压

AC 主频率

输出电压1

输出电压2

输出电压3

输出电压4

输出电压5

输出电压6

最大输出功率Po=Vo*I036效率

最大输入功率Pin=Po/Eff45输入滤波电容

纹波电压Vdcripple=?

最小直流电压

最大直流电压Vdcmax=1.414*Vacmax374.71

最大占空比

MOS管电压值Vds=Vdcmax+Vor455.71反射电压Vor=Dmax/(1-Dmax)*Vdcmin81

工作频率

功率因素Iripple=2*Iedc*Krf0.808081主电感量L=(Vdcmin*Dmax)2/(2*Pin*f*Krf)848.1635最大峰值电流Ip=Iedc+Iripple/2 1.414141

Irms=sqrt(3*Iedc2+(Iripple/2)2*Dmax/3)

681.8182

Iedc=Pin/Dmax/Vdcmin 1.010101 L=Vdcmin*Dmax/(f*Iripple)848.2483 0.6954270.696003