12V, 50W RMS Audio amplifier

Discussion in 'General Electronics Chat' started by dileepchacko, Dec 11, 2008.

  1. dileepchacko

    Thread Starter Active Member

    May 13, 2008
    102
    1
    Dear All

    I want an audio amplifier IC which is having following specification, this is for making a sub-woofer system for my car audio system.

    Power : 50W RMS
    Supply : 12V single source
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,652
    2,348
    Hello,

    For the power you require you should look out for a bridged amplifier.
    To keep it cool you could consider a class D amplifier (cold amp).
    http://sound.westhost.com/articles/pwm.htm

    Greetings,
    Bertus
     
  3. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    50W RMS is a voltage swing of 40V p-p into 4 ohms. A bridged amplifier will need each half to swing 20Vp-p so the amplifier must have a supply voltage of at least 25V.
    A DC to DC stepup power supply is needed for this amplifier in a car.
     
  4. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    I just remembered about the TDA1562 car amplifier IC from Philips. It operates bridged in class-H. The class-H doubles the supply voltage for loud output but not with ordinary and low output. Since the supply voltage switches then it stays cooler than if it always had the doubled voltage.
    It has a rated output of 55W into 4 ohms with 0.5% distortion when its supply is 14.4V.
     
  5. yash3311

    New Member

    Oct 4, 2008
    1
    0
    LM3875 is a good amplifier IC from national semiconductors it can deliver more than 50W.It sound so nice for sub-woofer..................
     
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