MC34063A在嵌入式宽电压输入中的应用

Application of switching power chip MC34063A in embedded wide voltage input devices

电源是电子系统中重要的组成部分,电源的稳定性直接影响到整个系统的性能和使用寿命。嵌入式系统中的核心电压多为+5 V,而使用环境往往不能随时提供+5 V电压。为了使嵌入式系统具有更广泛的适应性,在此根据MC34063A芯片的原理,介绍了一种依据此芯片进行的降压型宽电压输入电源电路的设计。通过计算电路外围器件的参数,完成具体电路的设计;最后对系统的几个重要性能指标进行了测试,测试结果验证了该宽电源输入电路具有良好的稳定性和实用性。相对于其他方式的宽电压,该设计具有更广范的适应性以及精确性。

Power supply is an important component of electronic system. The stability of the power supply affects the perfor-mance and service life of the whole system directly. The core voltage of embedded systems is usually ＋ 5 V. In order to make sure the system have a wider adaptability,the step-down wide voltage input circuit designed according to the principle of the switching power chip MC34063A is introduced. The circuit design was completed by parameter calculation of its peripheral devic-es. The several important performance indexes of the system were tested. The good stability and practicability of the wide voltage input circuit were verified by the tested results. Compared with other wide voltage modes,this design has a wider adaptability and accuracy.