Questions about automotive supply (ignition moment)

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automotive supply

Hi

I need an supply for 12 and 24 v , begin whit Switch regular of on semi
mc34166, i have a cuestion
how protect my circuit of ignition moment, in this transient the supply of car have peek 0v ~ vcc+40% , in this moment i lose my data in ram.


thanks for u comments!
 

two methods combined

You will have to use two methods at the same time, filter and clip. The filtering will be like a low pass filter using inductors and capacitors on the input of the switching regulator. Then you have to use clipping devices such as MOV or zener diodes.
 

Hi,
Try to squeeze AC in supply voltage with an inductor or capacitors.You can use voltage rectifiers or instant regulators.

Analyzer.
 

Apply a high capacity condenser and a serial schottky diode.
 

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