electrical characteristics of soft start circuit

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greatkaiyu

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who can tell me the meaning of the parameter "reset switch resistance" in the soft start circuit ?
thank u
 

Hey greatkaiyu!

A soft start circuit is needed to prevent a huge inrush current from damaging your circuit during startup.

So a series resistance is connected which limits the inrush current below a safe value. Then during normal operation this resistance is shunted.(shorted)

The value of this series resistance is the "reset switch resistance".

Giri
 

thank u vsgiri

i have some other questons.

firstly,where is the resistance coupled in the soft start circuit? could u give me an example,please?

secondly,what's the meaning of "full current limit" in the soft start circuit of a step up dc-dc convertor?
u see,here is a part of description in max8727

**broken link removed**
 

I don't think resistors are used in dc-dc converters as soft-start circuits ..
In the following article you will find out how it (soft-start, that is) can be implemented in dc-dc switching converters ..
"Simple soft-start circuit for switching regulators":
**broken link removed**



Regards,
IanP
 

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