TCA785 phase control ic

Discussion in 'The Projects Forum' started by Alvin24, Mar 19, 2009.

  1. Alvin24

    Thread Starter New Member

    Feb 11, 2009
    2
    0
    i can't get the control voltage (V11)from pin 11 in the straight line waveform when i connected the as the datasheet given. The synchronization voltage (V5) and the Ramp voltage (V10) i can get it as the datasheet stated . But the Control voltage (V11) i cant get it asstraight line as the data sheet stated. Which point i need to check for my circuits ?? HELP PLS... URGENT:confused: as the project due date is closer. Thanks :)
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
    Hello,

    Wich schematic did you use?
    There are several in the datasheet.
    Here is the first example:

    [​IMG]

    I have worked with the chip several times.
    Most times I had problems with the resistor Rsync, this must have enough power.
    I lately replaced them with 2X 470K, 1/4 Watt in parallel.

    Greetings,
    Bertus
     
    Last edited: Apr 13, 2009
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