tda2030 + power transistors

Discussion in 'General Electronics Chat' started by paulopca, Jan 11, 2014.

  1. paulopca

    Thread Starter New Member

    Apr 16, 2011
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    Help me, I need a schema to a power amplifier that uses the tda2030 and output transistors like tip41c and tip42c and split power supply.
    The power amp need to have a power of 30W in a load of 8ohms.
    I will be very grateful to those who could help me.
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Googling 'TDA2030 30W' throws up several schematics.
     
  3. t06afre

    AAC Fanatic!

    May 11, 2009
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    Why using that setup. It is far from the best approach
     
  4. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    When you use 2 TDA2030 chips in a bridge configuration you are able to get 28 Watts at 14 Volts supply.
    An other chip that might interest you is the LM3875.
    This will be able to output 40 Watts with a + and - 30 Volts powersupply.
    See both datasheets for more info.

    Bertus
     
  5. paulopca

    Thread Starter New Member

    Apr 16, 2011
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  6. paulopca

    Thread Starter New Member

    Apr 16, 2011
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    bertus
    I thank you for your reply. I would like to mount an amplifier with tda2030 and power transistors to do some tests.
     
  7. paulopca

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    Apr 16, 2011
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  8. bountyhunter

    Well-Known Member

    Sep 7, 2009
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    I think the 1K series resistors into the power pins of the 2030 are too high. The quiescent current for the 2030 will be something like 25 - 40 mA.

    I don't know if this type of circuit is stable. It increases the total gain and the 2030 was not compensated for it.
     
  9. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    When you look at the original schematic, it uses an old LM741 opamp.
    It also uses transistors in darlington configuration.

    If you want to "translate" it to the TDA2030, you will have to lower the resistor R1 and R2 to a much lower value.
    A value of about 27 Ohms would be more suitable when you use single transistors at the output.
    Also the resistor R3 needs a MUCH lower value.
    (this will create the changes in the current of R1 and R2).

    Bertus
     
  10. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    There will be a lot of Class B cross-over distortion because of the output transistors.
     
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