Transformerless SMPS using ICs

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    Please suggest some ICs for transformerless switched mode power supply circuits of 12V DC.

    Ligo George


    Kindly let me know what is the expected Input Voltage, Output Voltage, Required Current etc.


    Hi Ligo George,

    Here are my requirements,

    1.  Input Voltage upto 90-300V AC @50Hz
    2. I need dual output voltage – 5V and 12V
    3. Need isolated one
    4. It is used for out door application
    5. It is placed in IP65 plastc boxes
    6. It is used for out door street light application
    7. Should not use any transformers for stepdown

    Please sugget any IC for smps circuit without use of Transformer, I Knw one IC “LNK304DN”, which doesnt need transformer. Kindly suggest any other IC.

    Ligo George

    Check the IC SR086. It is a inductorless switched mode regulator designed to operate directly from rectified AC mains. But it will provide only up to 100mA current.

    If your application requires current higher than 100mA, you should use a ferrite coil.

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