LNK306 - Expecting 5.0V output... getting 10.4V output instead

Discussion in 'General Electronics Chat' started by Mahonroy, Mar 24, 2016.

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  1. Mahonroy

    Thread Starter Member

    Oct 21, 2014
    189
    5
    Hey guys,

    I used the LNK306 to create a 5.0V rail on my PCB. (120VAC input). I used the datasheet to come up with the component values.

    The problem is that I am getting a 10.4V output instead of the desired 5.0V. I double checked the feedback resistors, and they are 2K and 3.84K which should generate the desired 5.0V output.

    Has anyone had any experience with these line of IC's? I attached my circuit schematic, and the PCB layout of the circuit. Any help would be greatly appreciated as I am at a loss as to what might be wrong, or how to go about finding the problem, thanks!

    Here are the part #'s I am using for the Inductors, Diodes, and Capacitors:

    D1, D3: DFLU1400-7

    D2: US1JHE3/61T

    D4: FM4007W-W

    L1, L2: 46105C

    C4: GRM219R61E106KA12D

    C6, C7: 475CKE450MLN

    C8: 35ZLH100MEFC6.3X11

    R3: WP2S-7R5JA25

    lnk306_problem1.jpg
    lnk306_problem2.jpg
     
  2. ResFiber

    New Member

    Mar 9, 2016
    5
    1
  3. Mahonroy

    Thread Starter Member

    Oct 21, 2014
    189
    5
    I already have a topic posted there as well ;-)
    They have terrible customer service though so I wasn't holding my breath. I figured it would be more worth while to see about getting advice here instead.
     
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,969
    744
    Can only suggest altering the resistors feeding the fb pin, to see if it changes the voltage, never worked with this chip.
     
  5. bertus

    Administrator

    Apr 5, 2008
    15,638
    2,344
    Hello,

    Did you read the User Agreement ?
    In point 6 the restricted topics are mentioned.
    Transformerless powersupplies is one of them.

    Bertus
     
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