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关于MC34063的问题

Other Parts Discussed in Thread: TPS5430, LMZ34002

关于MC34063的问题:

我按照TI公司官网的MC34063资料搭建了5V转-12V的电路,(对应电路原理图见datasheet figure 11)但是使用MULTISIM仿真后得出的结果并不是12V(仿真见下图)。这是为什么呢?

从公式上看,输出值其实也就是只跟第5脚连接的电阻分压有关,那么还要如此严格计算电容和电感值是否还有意义?

急求帮助~~盼各路大神相助!