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Hi. I am going to use MC34063 for Boost Step up converter. I have used You calculator and it Works OK, bur here are my quistion: I need to have minimum 20V output, and the input cam be from 8-34V DC, will it be OK to apply higher input than output? I know that to output will follow input minus diode voltage, and that ik OK. It shall deliever supply for a laser sensor, and the laser sensor need 18-33V for working, so it OK that the voltage increase, but do it harm the MC34063?? I am aware, that I can put a PNP transistor on, so that the voltage alwayes will be 20B , but I don't need taht, all I need is that there alwayes is minimum 18V for sensor, therefore I choose 20V. Quistion2: Is it possibel to control ON/OFF of the converter? Mayve with a diode catode to Vref, and then apply 5V on anode of diode, will that be OK? Thank Yoy very much Per Haastrup Denmark

A complete step−up/down switching regulator design example is shown in Figure 18 theory and applications of the MC34063.

There is also possibility for ON/OFF control of the converter. Please refer to our application note AND8298 related to the NCP3065 application examples are on the page 3.

Answered by:
ON Semiconductor
2014-08-20 13:33:45.972