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TAS2505-Q1: Current of tas2505-q1 driving 2.5w/4 Ω horn

Part Number: TAS2505-Q1
Other Parts Discussed in Thread: TEST

ALL HI!

I use tas2505-q1 to drive a 4 Ω / 2.5W horn. Spkvdd provides 5V power supply and iovdd provides 3.3V power supply, because the IIC and IIS of SOC I use are 3.3V voltage. So what is the current of 5V and 3.3V respectively?What are the currents in the figure below? Ityp and IMAX. thank you!

  • Hi Sheng,

    The current on IOVDD would be very low, basically negligible. Regarding SPKVDD it would depend on the content being played as well as the load, I can run some test to provide an average typ value when driving 2.5W into 4-Ohm load.
    Let me know if this data would be OK for you to consider.

    Since you didn't mentioned AVDD and DVDD, I'm assuming you were planning to use internal LDO?

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • hello Ivan Salazar!

    Avdd and dvdd use internal LDO. I just want to know the maximum current required by the 5V power supply when driving the 4 Ω / 2.5W horn. Used for selection of external power supply specifications. thank you!

  • Hi Sheng,

    I ran a test on the EVM and got about ~1.2A max on SPKVDD being 5V, notice that at 2.5W into 4-Ohm the output is already clipping considerably (higher than 10%THD+N). From data sheet you can see that 25W is a bit lower than 10%THD+N for 5.5V SPKVDD.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • hello Ivan Salazar!

    1.2A is the average current?10% THD_ 2.6W (4 Ω, 5.5V) at n.What is the maximum power of the horn with 5V power supply without distortion(4 Ω)?

  • Sheng,

    That was not average, but maximum.

    My previous test was on a socketed board, I redid the test on a soldered board and maximum is a bit lower ~0.937A maximum. (There may have been some losses on the socket connection).

    Attached is a distortion vs power plot at 5V.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • hello Ivan Salazar!  

    My usage is 5V power supply, and then iovdd uses 3.3V power supply. What I want to know is how much power can I connect a 4 ohm speaker without distortion? What is the maximum current and average current of 5V power supply under the condition of maximum output power? Can you confirm it for me? thank you!

  • Hi Sheng,

    From the plot, you can consider about 1.8W below 1%THD+N.

    Regarding current measurements I'll have to redo tests in the lab, I can send further updates on Tuesday.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • Hi Ivan Salazar!  

    My usage is 5V power supply, and then iovdd uses 3.3V power supply. What I want to know is how much power can I connect a 4 ohm speaker without distortion? What is the maximum current and average current of 5V power supply under the condition of maximum output power? Can you confirm it for me? Can you drive 2W / 4 ohm without distortion at 10% thd + n? thank you!

  • Hi Ivan Salazar!  How is the output power of the arrow in the figure above calculated?

  • Hi Sheng,

    I tested EVM once again with some results below:

    • SPKVDD = 5V
    • Load = 4-Ohm+15uH
    • Output power = 2W
    • THD+N = 2%
    • Average SPKVDD current = 525mA
    • Peak SPKVDD current = 1.18A

    Also adding previous results:

    • SPKVDD = 5V
    • Load = 4-Ohm+15uH
    • Output power = 2.5W
    • THD+N = 12%
    • Average SPKVDD current = 652mA
    • Peak SPKVDD current = 1.2A

    Based on the above, the device can drive 2W/4Ohm < 10% THD+N.

    Regarding the power consumption table, the system setup is described in the same document, voltage levels are described in the table title, and all these measurements are taken when device is enabled but idle (not playing audio).

    Best regards,
    -Ivan Salazar
    Applications Engineer