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

[grittinjames]

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

 

[Rishi2530]

simple smps circut

hi,
what operating voltage u needed

 

[grittinjames]

simplest smps

230 to 12v

 

[Khabree]

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.

 

[oddbudman]

ncp1200 india

Check power integrations and st viper 12/22 application notes.

http://www.powerint.com/

oddbudman

 

[grittinjames]

simple smps circuit

i like to get a self oscilating type?

 

[max0412]

Re: simple smps circuit

You can try the NCP1200: Current Mode Controller Fixed Frequency

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.

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

Cores are here.

http://www.coilcraft.com/y8844.cfm

 

[grittinjames]

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

 

[mister_rf]

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.