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TPA3130 bootstrap capacitor on mono mode (PBTL)

Akio Ito
Genius 3595 points
Other Parts Discussed in Thread: TPA3140D2, TPA3130D2

Hi,

My customer wants to reduce the number of bootstrap capacitors on mono mode (PBTL) of TPA3130 as shown below.

Is it possible to combine two 0.22uF into one 0.47uF?

Best regards,
Akio Ito

  • 0
    TI__Expert 5000 points

    Hi, Akio

               TI do not recommend this method due to the internal NMOS driver for OUTP and OUTN are independent. 

  • 0 in reply to Peter Cao
    Genius 3595 points

    Peter-san,

    Thank you for a quick response. I will tell your answer to him.

    Best regards,

    Akio Ito

  • 0 in reply to Akio Ito
    Genius 3595 points

    Peter-san,

    The customer does not agree to your answer because it is possible in TPA3140D2, see Figure 26 of TPA3140D2 datasheet. Why is it impossible in TPA3130D2?

    Best regards,
    Akio Ito

  • 0 in reply to Akio Ito
    TI__Expert 5000 points

    Hi, Akio

               Yes, Customer can use it. Just let them know the background, do not worry about it, because TPA3140d2 has verified with mass production.

  • 0 in reply to Peter Cao
    Genius 3595 points
    Peter-san,

    TPA3140D2 was designed in consideration that the four bootstrap capacitors can be combined into two in PBTL mode, but TPA3130D2 was not.
    Is this understanding correct?

    Best regards,
    Akio Ito
  • 0 in reply to Akio Ito
    TI__Expert 5000 points
    Hi, Akio
    To be frankly, it is better to use four capacitors theoretically. So several years ago, in TPA3130D2's datasheet ,we suggest customer to use as this method. But, in order to help customer to lower their BOM cost (Lower cost is the trend), we use only 2 capacitor in TPA3140D2's reference design, we has done some validation job in Lab, customer also use this reference design with mass production.
    But TI still recommend to use four capacitors.
  • 0 in reply to Peter Cao
    Genius 3595 points

    Peter-san,

    Thank you for valuable information.

    Best regards,
    Akio Ito