Op amp array

Discussion in 'General Electronics Chat' started by Highlight, Jun 13, 2012.

  1. Highlight

    Thread Starter New Member

    Nov 26, 2010
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  2. chuckey

    Well-Known Member

    Jun 4, 2007
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    1. Take care with the chip power dissipation ~ 7mW. See fig. 6, depends on load and output voltage required. i.e. 20mA @100 ohms 12 mA @ 1K. . .
    Frank
     
  3. #12

    Expert

    Nov 30, 2010
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    I think your datasheet is wrong or you're reading it wrong. Try this one. 680 mw per chip and more than 20ma at 1K load
     
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  4. Highlight

    Thread Starter New Member

    Nov 26, 2010
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    Thanks for your replies. So the output current maxes out at around ~25mA? I want to calculate the maximum possible current consumption of the part, would this be (max output current*4)+(quiescent curent*4)=4X25ma + 250uA*4 = 101mA. Is this correct?
     
  5. #12

    Expert

    Nov 30, 2010
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    It's 250 ua per channel + whatever you really put on it for 4 loads, but limited to 680 mw per chip, but that depends on what your supply voltage is, and the chip doesn't consume the output current, the loads do.

    Vaguely, your math is right but there are lot of "buts" included.
     
  6. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    Correct, just to add if you're drawing those 20mA @100 ohms where there is 2V on the output the rest of the supply voltage is being dropped by the device itself.

    So in that case the amp is burning more watts then the load is.
     
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