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Original question:

Class-D Amplifier TPA3116D2 driving 100V audio transformer

TPA3116D2: Class-D Amplifier TPA3116D2 driving 100V audio transformer

Anwej Alam21
Intellectual 415 points
Part Number: TPA3116D2
Other Parts Discussed in Thread: TPA3255, TPA3255EVM

Hi

I am using TPA3116D2 for 2 channel Stereo Audio Amplifier for 4 and 8Ohm speakers. I want to use this same device for a 100V Line Matching Audio Amplifier for an output power of 100W mono.

I have below concern before going forward for the next step into the design

1. I have experient that this device has protection features especially for DC-Offset and Output overcurrent/shortcircuit and when trigger these fault device always gone into Latch mode, never recovered automatically, Designing 100V line matching we need to operate this device in PBTL mode at 2 ohms, How to manage fault and latch state

2. Any reference document and details for selection and calculation transformer for 100V 100W?

3. How to increase Power up to 200W Mono, is there any other Part# is available which can support operating at 48VDC

Please let us know if any possibility of fulfilling of above requiremt 

Regards,

Anwej Alam

  • 0
    TI__Mastermind 27400 points

    Hi Anwej,

    My answers to your questions can be found below:

    1. I recommend tying the FAULTZ pin directly to the SDZ pin to achieve automatic recovery. You can find more information on section 7.3.9 DC Detect Protection in the TPA3116D2 datasheet. 

    2. We have an incomplete transformers guide that might be helpful for you. I can send to you offline. 

    3. I recommend taking a look at the TPA3255. This device is an analog input device that can output up to 600W into a 2ohm PBTL. This should be more than enough for your system needs. 

    Hope this helps! 

    Best Regards,

    Robert Clifton

  • 0 in reply to Robert Clifton56
    Intellectual 415 points

    Dear Robert,

    Thanks for your response

    1. I recommend tying the FAULTZ pin directly to the SDZ pin to achieve automatic recovery. You can find more information on section 7.3.9 DC Detect Protection in the TPA3116D2 datasheet. 

    ANWEJ: Thanks, We will try it, is there any need of introducing a delay?

    2. We have an incomplete transformers guide that might be helpful for you. I can send to you offline. 

    ANWEJ: Yes, Please share on my email id or in PM

    3. I recommend taking a look at the TPA3255. This device is an analog input device that can output up to 600W into a 2ohm PBTL. This should be more than enough for your system needs. 

    ANWEJ: This is a very new device to me, and we don't have any ready hardware for the test, 2 Ohms is very low impedance and not very common in a speaker system, can we use 4 or 8 ohms for the same requirement?

     

    Waiting for your valuable response thanks in advance

    Regards,

    Anwej Alam

  • 0 in reply to Anwej Alam21
    TI__Mastermind 27400 points

    Hi Anwej,

    My answers below:

    1. We don't mention needing to use a  delay so no, it shouldn't be needed. Though I'm sure you could add one if your system will do better with it. 

    2. I'll send right away.

    3. Using the TPA3255, 4ohms will get you 260W with 1% THD, and 150W into an 8ohm load at 1% THD. At higher impedance values, the amplifier is limited by the voltage draw not the current. 

    Best Regards, 

    Robert Clifton

  • 0 in reply to Robert Clifton56
    Intellectual 415 points

    Dear Robert,

    Thanks for your reply. and many thanks for the document.

    I want to start with TPA3255 and 4 ohms, How to get the EDA file of TPA3255EVM? So that we can make the custom board quickly.

    I will do the calculation of transformer as per requirement but the question is which type core to be used for a wide range of flat frequency response at least 80Hz to 15KHz and 80dB Noise rejection.

    Regards,

    Anwej Alam

  • 0 in reply to Anwej Alam21
    TI__Mastermind 27400 points

    Hi Anwej,

    I've sent the Gerber files for the TPA3255EVM to you through email.

    The transformer question would be better left to the transformer manufacturers. Especially since there's always new product on the market.

    Best Regards,

    Robert Clifton

  • 0 in reply to Robert Clifton56
    Intellectual 415 points

    Dear Robert,

    Thanks for Sharing EVM Gerber.

    In India, there are very few and limited transformer manufacturers available, to design and customize this type of transformer, If we guide them then I am very sure that they can fix and freeze the transformer design data for us for production and give the production.

    Regards,

    Anwej Alam

  • 0 in reply to Anwej Alam21
    TI__Mastermind 27400 points

    Hi Anwej,

    Understood. And thanks for sharing the insight on transformer manufacturers.

    Glad I could assist you! 

    Best Regards,

    Robert Clifton 

  • 0 in reply to Robert Clifton56
    TI__Mastermind 44965 points

    Hi Anwej,

    Please read this App Note, if you have not already done so.

    link

  • 0 in reply to Gregg Scott
    Intellectual 415 points

    Dear Gregg,

    Thanks for the Link, I have gone through this App Note, Based on this document I was convinced to consider this design on TPA3116D2.

    Regards,

    Anwej Alam