Capacitor Voltage Rating in attached schematic

Discussion in 'The Projects Forum' started by tracecom, Sep 30, 2012.

  1. tracecom

    Thread Starter AAC Fanatic!

    Apr 16, 2010
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    The attached schematic is from the ST datasheet for the TDA2005R. What is the minimum safe voltage rating for the two 2200μF output caps assuming a Vs of 15 or less?

    Thanks.
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    U can start with 50VDC
     
  3. panic mode

    Senior Member

    Oct 10, 2011
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    ...and where do you stop?
     
  4. tracecom

    Thread Starter AAC Fanatic!

    Apr 16, 2010
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    Maybe I didn't phrase my question correctly. I would like to know the minimum safe working voltage of the 2200μF output capacitors shown in the stereo amp schematic in post 1. I am aware that 50V caps would work, but, as you can see from the attached table, they are quite large, and I would like to keep the assembly as small as possible and stil have a safe design. All of the caps used in the (attached) BTL schematic are 10V or less, but there are no large output caps used there, so I am not sure what's correct.

    Thanks for your help.
     
  5. ifixit

    Distinguished Member

    Nov 20, 2008
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    For Vs=15V...

    A 16V electrolytic is more than enough, but you can use higher voltage ratings if you have some handy, and room for the larger size. The highest voltage the cap will ever see is 15V, and then, only if the amp output has failed and is shorted to the VS rail. :(

    Regards,
    Ifixit
     
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  6. tracecom

    Thread Starter AAC Fanatic!

    Apr 16, 2010
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    Thanks. I suspected that, but wanted a more knowledgeable person's opinion.
     
  7. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    I wouldn't use a 16V caps.

    I am happy with 50 but in ur case, u can try 35V
     
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  8. Audioguru

    AAC Fanatic!

    Dec 20, 2007
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    The output capacitors have a voltage of only 7.5V across them. Capacitors rated at only 10V will last a long time but might be too small. Use 16V or 25V capacitors.
     
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