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TPA6130A2: Check schematic

Kirill Panin
Prodigy 30 points
Part Number: TPA6130A2
Other Parts Discussed in Thread: TCA9543A, TPA6133A2

I want to use TPA6130A2 in BTL mode, so I will need two of them and I2C switch (such as TCA9543A), am I right?

Only left channels in BTL mode will be used, but I still routed right ones.

Can you please check the schematic and pcb and point me to mistakes (if any)?

 amplifier.pdf

amp_pcb.pdf

  • 0
    TI__Guru** 110425 points

    Hi Kirill,

    You're correct, i2C switch would be needed.  Schematic and layout seem OK.

    Have you evaluated before the output of both devices in BTL connection? I wonder if using a single device, with inverted input signal would also work OK. How did you decided to use a pair of these amplifiers in BTL connection?

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    Prodigy 30 points

    Hi,

    No, I haven't evaluated the output before. I need amplifier that can provide at least 2 channels * 125-150mW at 32 Ohm load. There are not a lot of ICs that are capable of this. Initially I wanted use TPA6133A2 because it does not require I2C, but it does not provide enough output power. Then I found very similar TPA6130A2 (it looks like it's actually the same chip with slight modifications) with BTL, which gives me probably what I need. 

    What do you mean by inverted signal? Connecting LEFTINM to RIGHTINP and vice versa? I guess this is good way as well, however I will still need I2C switch for i.e. volume control (as TPA6130A2's registers are volatile. Or there is a way to restore their state after shutdown?) as I need 2 output channels. Does this approach have some benefits? Can I, for example, use TPA6133A2 in such configuration? How much power I can expect (3.3V)?

  • 0 in reply to Kirill Panin
    TI__Guru** 110425 points

    Hi Kirill,

    I'll try to test a similar setup in the lab, focusing on the BTL connection for a single device. I'll let you know the results by Thursday this week.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • +1 in reply to Ivan Salazar
    TI__Guru** 110425 points

    Kirill,

    I was setting up the test and then I noticed that TPA6130A2 already includes description and data for BTL use case, I think I missed this one in the first place. Let me comment on some of these below:

    • The device should be configured for BTL mode, using bits 5:4 from register address 0x01 to 0b10, along with the rest of the register configuration.
    • BTL performance for 32 ohms is displayed in Figure 8 from data sheet. Based on this I think you can get the required 125-150mW at VDD>=3V. Please notice this is for a single speaker, so you'll need a pair of this both in BTL mode.
    • Input and output connection is as described in Section 8.4.7 from data sheet:
      • the device will take the left channel input
      • drive a single load connected between HPLEFT and HPRIGHT in a bridge-tied fashion

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    Prodigy 30 points

    Thanks.

    Can you tell me what marking on these ICs mean? Do they look original to you?

  • 0 in reply to Kirill Panin
    TI__Guru** 110425 points

    Hi Kirill,

    BGS marking is correct, lot code on the bottom would need to be traced.

    Are you having any issues with these samples?

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    Prodigy 30 points

    I haven't checked them yet, waiting for PCB to be produced.

    I got them from not very reliable source, so I wanted to be sure that they're not obviously fake.

    Also, the bottom left IC looks cracked. Can this cause problems? It does not fall apart, crack appears to be only on the surface. I'll try to make better photos of it tomorrow.

  • 0 in reply to Kirill Panin
    TI__Guru** 110425 points

    Hi Kirill,

    I did noticed the cracks, although the chip itself may be OK.
    Let us know if you face any problems when testing these.

    Best regards,
    -Ivan Salazar
    Applications Engineer