脉宽调制器UC3842在开关电源中的应用

Application of Pulse Width Modulators UC3842 in Switching Mode Power Supply

介绍了UC3842的引脚排列、各引脚的名称,讨论其构成的开关电源的电路设计和参数限制,并给出应用实例。器件材料:国产MXO-2000锰锌铁氧体制成的EE型磁芯,美国IRFPG407型VMOS 管,FR309型快恢复二极管、肖特基二极管等;基本参数:脉冲信号最大占空比Dmax=41.5%,初级线圈电感量L1=2.48 mH,初级线圈匝数N1=90匝,自馈线圈匝数N2=11匝、次级线圈N3=4匝,空气隙δ=0.6 mm。

The University of science and name of UC3842 are introduced. The circuit design of switching mode power supply and parameter restriction are analyzed. The application instances are given. The instruments and materials are: EE type core magnet made from national production MXO-2000 Mn, Zn, Fe, O; American IRFPG407 type VMOS tube; FR309 base rapid recovery diode; Schottky diode, etc. The basic parameters are: the maximum occupied spacing ration of ping radar Dmax=41.5; the inductance quantity of primary coil L1=2.48mH; the twist of primary coil N1 =90turns; the twist self-fed coil N2 =11turns; secondary coil N3 =4turns; the air separation =0.6mm.