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Looking for a 100w chip amp at 14.4v and 1 ohm does TI have any solutions that come close?

JOE HOBART
Prodigy 10 points
Other Parts Discussed in Thread: OPA541

As stated above have a application for an OEM that needs around a100w at 1 ohm while running off of 14.4v DC no boost supply.

  • 0
    Guru 140200 points

    Hi Joe,

    100W at 1R means 10Vrms and 10Arms which is 14.1Vpeak and 14.1Apeak? With a 14.4V DC supply this would mean to use a bridge topology?

    Kai

  • 0 in reply to kai klaas69
    TI__Mastermind 24971 points

    Hey Joe,

    14 amps is much more than any general purpose amplifier can supply. Would they be open to a topology of an op amp driving a FET? Then they could drive an external FET that can provide much more output current than the amplifier can.

    Best,
    Jerry

  • 0 in reply to Jerry Madalvanos
    Prodigy 10 points

    There is actually a ST that we are using now that basically does this its 92w at 1 ohm 10% thd  we are looking to replace this chip with a TI option if possible if not we will build a discrete one

  • 0 in reply to JOE HOBART
    TI__Mastermind 24971 points

    Hey Joe,

    We do have a selection of power amplifiers. I will move this thread to the precision amplifiers team and they would be happy to assist you!

    Best,
    Jerry

  • 0 in reply to Jerry Madalvanos
    TI__Guru 51511 points

    Hi Joe,

    As stated above have a application for an OEM that needs around a100w at 1 ohm while running off of 14.4v DC no boost supply

    Can you specify if the power application is DC or AC? If it is AC application, please specify the op amp's operating frequency, voltage amplitude and current etc..I'd like to know the design requirements.  

    I assumed that you are talking about 1ohm load with the wattage of approx. 100W, which is the circuit output voltage at approx. 10V in DC (V*V/R = 100W at the load).  

    Best,

    Raymond

  • 0 in reply to Raymond Zhang1
    Prodigy 10 points

    Raymond it is 14.4 dc

  • 0 in reply to JOE HOBART
    TI__Guru 51511 points

    Hi Joe,

    please specify the op amp's operating frequency, voltage amplitude and current etc..I'd like to know the design requirements.  

    If this is DC application with supply rail of 14.4Vdc, where op amp's Vout = 10V, 1Ω load @10A, then it is much simpler. We just need to make sure that heat dissipation across the power amplifier will be low.  

    You may need to reduce the supply voltage from 14.4Vdc to 12Vdc or so, then the heat dissipation at driving power amplifier will be reduced significantly, and it is likely that PRAMPS may accommodate for that. 

    Best,

    Raymond

  • 0 in reply to Raymond Zhang1
    TI__Guru 51511 points

    Hi Joe,

    Our OPA541 is able to source 10Adc continuously, but the input and output driving application have certain constraints.

    If this is DC power application or you will use the power amplifier as a voltage regulator to drive 1Ω at 10Adc, I would recommend to build a low drop out series voltage regulator. We have many highly accurate LDO that will meet your need at the current level. 

    If this is for AC application, I need to know the application requirements. 

    Best,

    Raymond