Help me make a simple smps circuit (6V 500mA)

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grittinjames

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hai all
i like to make a simple smps of 6v and 500ma .
it shuld be of self oscilating . feedback is not must.
one of such circuit i had seen in a china made mobile charger . any body having similar one
 

simple smps circut

hi,
what operating voltage u needed
 
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    jpies

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application notes for viper 12 smps

I think the simple circuit for converting 220V to 12 or 6V is with the IC UC3843 (Current-Mode PWM Controller). You can download circuits from the web, its easily available.
 

simple smps circuit

i like to get a self oscilating type?
 

    V

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Re: simple smps circuit

You can try the NCP1200: Current Mode Controller Fixed Frequency

Code: 
http://www.onsemi.com/PowerSolutions/product.do?id=NCP1200

They have an appnote on a charger.

Coilcraft gave me three free samples.I got the 70W with aux winding and the 10W Y8848-AL three of each. They also have the coupled inductors for the 6.5 V, 0.54 A charger. I got my samples in about a week. The appnote for the 6.5 V, 0.54 A charger is here.

Code: 
http://www.onsemi.com/pub/Collateral/AND8023-D.PDF


Cores are here.
Code: 
http://www.coilcraft.com/y8844.cfm
 

simple smps circuit

i found a circuit in a china product which dosent have any ic.it is working just witht two transister
is any one know about this
 

    V

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Re: simple smps circuit

A simple solution it’s based on the schematics used to produce a +5V stand by in a ATX power supply .
Anyway now it’s so simple to use one of the ''IC switch power green mode'' series
circuits :
FSDL0365, FSDH321,
VIPer12A, VIPer53,
NCP1050, NCP1051, NCP1000, NCP1001,
FSD210B, FSD200B, FSDM311,
TEA1520, TEA1521, TEA1523,
KA5H0265RC, KA5M0265R.
 

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