【摘要】 针对仪器仪表设备电源电路的特点,以单片开关式DC/DC变换器L4978为核心,设计了一种3.3~55 V可调式开关电源。介绍了开关电源和L4978的工作原理,给出一种典型应用电路设计与器件选用的方法。电路具有小体积、高效、低功耗等特点。更多还原

【Abstract】 In view of the characteristics of the power supply circuit of apparatus and instruments,a kind of 3.3~55 V adjustable switching power supply was designed with a single-chip power converter L4978 as its core.The paper introduces the on-off power supply and the makeup and principle of L4978,and also gives the design of a typical applied circuit and the method of the element selection.The circuit is characterized by its small size,high efficieny and low power consumption.更多还原