基于LM5026的DC/DC电源降耗设计  

Designing of DC/DC Reducing Consumption Based on Current Type PWM LM5026

作　　者：郑大连[1] 杨忠孝[1] 张榆平[1] 

机构地区：[1]电子科技大学,四川成都611731

出　　处：《通信电源技术》2011年第1期14-18,共5页Telecom Power Technology

基　　金：广东省产学研示范基地项目(H04010701CXY2009006)

摘　　要：介绍了DC/DC电源降耗原理,以及LM5026芯片CS端的两种电流采样方式:利用采样电阻进行电流采样和利用电流互感器进行电流采样,并比较了各自的优缺点。实验结果表明,两种电流采样方式都能有效控制PWM信号的输出,保证芯片工作的安全性和稳定性。而采用电流互感器进行电流采样,更加有效提高了电路的转换效率,达到了电源降耗的效果。This paper introduces DC/DC reducing consumption principle and two ways for current sampling in the current type PWM LM5026 CS pin,the current is sampled by using a sampling resistor and a current sense transformer,and their respective advantages and disadvantages are compared.Experimental results indicate that both ways can effectively controlle the output of PWM signal,ensure the safety and stability of the chip.However,the use of current transformer for current sampling can effectively improve circuit＇s conversion and reduce power consumption.

关 键 词：LM5026芯片 有源箝位 RC滤波网络 电流互感器 

分 类 号：TM46[电气工程—电器]