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TPA3132D2: Burst Ratio cycle length

[FAE] Andrew Wang
Genius 10685 points
Part Number: TPA3132D2


Hi Team,

We provided a thermal test result in our datasheet, and also specified Burst Ratio (1:3 and 2:5).

Customer wants to understand is there a general rule of Burst Ratio at testing that most class-d amp maker usually follow?

If no rule existing, why we choose this ratio -> 1:3 or 2:5? 

How long each cycle last? Thank you!!

Andrew

  • 0
    TI__Expert 6295 points
    this is just reference to guidance thermal capability. you could also set other config: like every 8th cycle and Measure at 10Hz, 100Hz, 500Hz, 1kHz etc. to check max power capability.
  • 0 in reply to Xiaolin Qin
    TI__Genius 10685 points

    Hi Xiaolin,

    This is very critical for my customer to continuous choosing our device in next gen.

    Can you tell me when we tested 1KHz full power and 1KHz 1/8 full power, what are the cycle time length for each? 

    If you don't know the test detail, can we say a reasonable time for thermal to reach balance state like 1 hour total for example?

    Within 1 hour with ratio 1:3, and we split it into 4 section; 15 mins each, and full power continuously run 15 mins and 1/8 full power run 45 mins?

    Thanks.

    Andrew 

  • 0 in reply to [FAE] Andrew Wang
    TI__Genius 9995 points
    Hi Andrew,

    Well understand that thermal is vital to your customer. But can you tell me in detail, what is your customer's main concern?
    Does they just have no idea about how to explore maximum device temperature? Or they need to build-up certain testing procedures？

    As you known, TPA3132's thermal performance is highly related with layers of PCB, thickness of copper, layout and placement. In our EVM board,
    what you find in datasheet is just a kind of method for us to explore the maximum device termperature. Thermal performance is highly related with the process of the build-up of heat balance. 1:3 and 2:5 has different speed of heat generation. Hence, you can see different values here. What we want to tell customer is that customer can evalute and explore the theraml performance in this way. But it does not mean it is a general rule for all and it is just a method.

    Regards,
    Alix Wan.