I/P:85-264VAC,O/P:8V/0.7A,效率:80%,开关频率:60KHZ,DMAX:0.45.DMIN:0.16,IC用VIPER22A
设计:铁心用RM5:其AE=23.7MM2
IOB=80%*0.7A=0.56,匝比N=VIN/(VO+VF)*D/(1-D)=100/8.5*0.4/0.6=8
DMAX=N*(VO+VF)/100+N*(VO+VF)=68/168=0.4048
DMIN=68/(370+68)=0.16
△ ISB=2IOB/(1-D)=2*0.56/0.5952=1.9A
LS=8.5*0.5952/1.9*60000=44UH
LP=N*N*LS=64*44=2816UH
△ ISP=IO/(1-D)+△ISB/2=0.7/0.5952+1.9/2=2.126A
△ IPP=△ISP/N=2.126/8=0.26575A
NP=(LP*△IPP)/(△B*AE)=2816*0.26575/0.2*23.7=158圈
NS=158/8=20圈,VCC1=14.5/(8.5/20)=14.5/0.425=34圈(给VIPER22供电)
VCC2=VCC1(给358供电)
