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  1. #1
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    Looking for schematic of a SMPS for 230V AC To 5V DC

    i want to build a smps for 230v ac to 5v dc / 1 A current. can any one give schematic with mosfets / ics and specifications for transformer to be used. i have to finish my project . so i need this power supply

    Added after 1 minutes:

    i want to replicate the circuit of nokia battery charger but with higher current i.e 1A. can any one help me with values of components and specs of transformer

    •   Alt6th June 2009, 14:10

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    nokia smps

    http://www.powerint.com/en/design-su...esign-software

    browse thru that.you will get some hints.



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    smps 5v schematic

    Yeah i did go thru this site but this site recommends the use of linkswitchII IC (LNK616PG) and a 10pin transformer EE16 for an o/p of 5V n 1A.
    Recently i hav stripped a nokia charger(duplicate) with specs 5.5V n 0.5A n found that it uses a power transistor (E13003) for the switching purpose and a 6pin transformer. In the powerint site i find these components LNK616PG n EE16 transformer bit expensive. LNK616 is 50$ for 10pcs.
    So can u help me in designing a cheaper ckt by providing a schematic for the SMPS power supply with o/p specs 5V n 1A which uses just power transistors or mosfet's for switching



    •   Alt9th June 2009, 11:31

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    schematic of duplicate nokia charger

    for getting 5V DC and 1A current
    the best thing is LM7805 or simply 7805

    use a transformer of rating 0-12V 1A
    use a rectifier ckt
    use a filter capacitor
    and 7805

    you will get 5V dc with max o/p current of 1A



    •   Alt9th June 2009, 11:46

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    schematic of nokia smps

    Ok but what about switching??? i will be requiring a power transistor or a mosfet for switching otherwise its not an smps ckt n it will b just conventional ac/dc conversion ckt with bulky transformer...



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    smps ckt

    if you want switching you will be requiring more than one power supply
    as in SMPS there is a supply which is always on whether the computer is powered ON or not
    so when we powered On the computer it switches ON the other supplies
    so is that you want to switch ON the SMPS like this??



    •   Alt9th June 2009, 12:14

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  7. #7
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    nokia circuit smps

    I am designing an smps circuit with a/c input of 210-240V 50Hz and an output of 5V and 1A. I went thru the powerint site for devoping smps ckt but it recommends use of linkswitchII(LNK616PG) and EE16 10pin tranformer.

    Ref for sch: http://www.powerint.com/sites/defaul...tics/di158.gif

    But am interested in building an smps with just a power transistor or a mosfet for switching instead of LNK616PG and a suitable transformer. Can anyone help me out for building such a ckt which is popular in mobile phone chargers???



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    smps of the schematic




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    lnk616

    see,with if using just a transistor or a switch ,how can you generate the switching signals??



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    smps mobile phone charger circuit

    Yeah i too thought of the same. But when i stripped a nokia charger(duplicate) with o/p specs 5.5V/0.5A to learn smps ckt and i din find any smps ic and i found only a power transistor. So is it possible to build an smps ckt without smps ic???

    Added after 4 hours 27 minutes:

    can any one pl explain on what factors does output current depend on . can we change the output current of smps by changing resistor values or transformer or any other parameters



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