一种新型的低纹波开关电源

A New Switching Power Supply with Low Output Ripple

传统开关电源具有输出纹波大、辐射干扰大等缺点 ,应用场合受到限制。文中分析了传统开关电源输出纹波的产生机理 ,介绍了斜波驱动方式的优点和新型电源专用集成电路LT1 5 33的工作原理 ,给出了非隔离式 2 4V输入 ,5V、1A输出的推挽变换器设计实例。试验结果表明输出纹波降低到小于 2mV(峰 峰值 )。

Classical switching power supply has some disadvantages such as high output noise ripple and EMI. So its applications are limited. This paper analyzes the mechanism of producing output noise ripple in classical switching power supply. The advantage of slew driver and working principle of LT1533 is introduced. It presents the solution to problems and typical circuits for application. Experimental results show that output noise ripple is reduced to less than 2 mV(P-P).