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MC34063a反转电压输出异常

Other Parts Discussed in Thread: MC34063A

使用MC34063a,输入电压5v,R1=820,R2=5.1K,按照下面公式理论输出电压V=-9V,但是实际总是-4V左右,无负载情况下输入电流为190mA。

在电路调试过程中,pin3和4之间的电容用了普通的非极性电容,输出按照右下角带电感滤波接法,其他相同