基于UC3842的三路输出小功率开关电源设计  

Design of a Three Output Small-Power Switching Power-Supply Based on UC3842

作　　者：王侠[1] 王进军[2] 

机构地区：[1]西安科技大学电气与控制工程学院,西安710054 [2]陕西科技大学理学院,西安710021

出　　处：《电子器件》2015年第4期785-789,共5页Chinese Journal of Electron Devices

摘　　要：设计一种48 V转+5 V,±15 V开关电源。以UC3842作为PWM控制器,采用电阻,TL431和线性光耦等元器件构成电压采样反馈电路。主输出(+5 V DC@2 A)电压精度0.5%,纹波0.4%;辅输出1(15 VDC@500m A)电压精度为2%,纹波0.13%;辅输出2(-15 VDC@500m A)电压精度2%,纹波0.33%。开关电源具有精度高、纹波小、效率高、性能可靠等优点,可广泛应用于各类小功率变换场合。A switch converting 48 V to the ＋ 5 V,15 V switching power supply has been designed. UC3842 used as PWM controller; resistance,TL431 and linear photoelectric coupler components as a voltage sampling feedback circuit. The accuracy of main output voltage（ ＋ 5 V DC@ 2A） is 0. 5%,the ripple of voltage is 0. 4%; the accuracy of auxiliary output voltage 1（ ＋ 15 VDC@ 500 m A） is 2%（ 14. 7 V）,the ripple of voltage is 0. 13%; the accuracy of auxiliary output voltage 2（-15 V DC@ 500 m A） is 2%,the ripple of voltage is 0. 33%. The switching power supply has high precision,small ripple,high efficiency and high reliable,which can be widely used in all kinds of small power conversion applications.

关 键 词：开关电源 UC3842 脉冲宽度调制 电压精度 

分 类 号：TM564.8[电气工程—电器] TM91