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SN10502: About current consumption specifications

Tsukui Yusuke
Guru 21930 points
Part Number: SN10502
Other Parts Discussed in Thread: TINA-TI, THS4222, OPA2830, OPA2836

Hi,

My customers are considering the following circuits.
SN10502.pdf
When evaluated with an actual machine, it was found that the heat generation was large.
I checked the data sheet and confirmed the following current consumption information.



However, the input current of the actual machine was larger than this spec.
(The input current was 30mA per circuit.)

Could you give me some advice on why the power consumption is high?
Or is it the expected spec?

Best regards,
Yusuke

  • 0
    TI__Mastermind 22280 points

    Hello Yusuke-san,

       Usually this happens when there are oscillations or the amplifier's output current is very high. For the pdf you shared, can you share the Tina-TI file or share what are the characteristics of the input signal? What is the load on the board, and would they be able to share the output scope shots? Are they getting the correct output voltage?

    Thank you,

    Sima

  • 0 in reply to SimaJalaleddine
    Guru 21930 points

    Hi Sima-san,

    Thank you for your response.
    I attach the Tina-TI file.
    SN10502.TSC

    >What is the load on the board, and would they be able to share the output scope shots?
    It generates a lot of heat even when there is no load.
    As a result, the customer could not tolerate the heat generation and changed the design to operate at 5V.

    By changing to 5V operation, customers are looking to choose another device.

    Could you recommend a 5V product with better specifications than the SN10502?

    Best regards,
    Yusuke

  • 0 in reply to Tsukui Yusuke
    Guru 47485 points

    Well the TSC you inserted is using an encrypted op amp model and is locked - can't do much with that, but looking at it - that 100uF capacitance may be causing a self oscillation in the input stages - try putting 100ohm in series with each V+ input. Also, that SN10502 is a relabeled THS4222 which has a full transistor TINA model. You should be using that for sim. 

  • 0 in reply to Michael Steffes
    Guru 47485 points

    I went into the product folders for both devices, no TINA model in either - there is however a model in the TINA V11 library, here you go, 

    THS4222 TINA model.TSC

  • 0 in reply to Michael Steffes
    Guru 21930 points

    Hi Micheel-san, Sima-san,

    Thank you for your support.
    I ran a simulation but couldn't figure out the fever problem that the customer had.
    Therefore, we would like to introduce new devices according to customer's request.

    Could you recommend a 5V product with better specifications than the SN10502?

    Best regards,
    Yusuke

  • 0 in reply to Tsukui Yusuke
    Guru 47485 points

    Well the parametric crossreference is not working well here - look at the OPA2830, but a TINA file would help a lot, 

  • 0 in reply to Tsukui Yusuke
    TI__Mastermind 22280 points

    Hello Yusuke-san,

       Which specifications for the SN10502 is important to the customer? Are they looking for around the same bandwidth but for a single supply 5V amplifier? 

    Thank you,
    Sima

  • 0 in reply to SimaJalaleddine
    Guru 21930 points

    Hi Sima-san,Michael-san,

    Thank you for your response.
    >Are they looking for around the same bandwidth but for a single supply 5V amplifier?
    Yes.They are looking for upward compatible devices, including bandwidth specs.
    Is OPA2830 the most recommended 5V device?

    Best regards,
    Yusuke

  • 0 in reply to Tsukui Yusuke
    TI__Mastermind 22280 points

    Hello Yusuke-san,

      Still not too sure which specs are most important to the customer. Here is a link with a wider list of products filtered down to around or above the same bandwidth, architecture, and channels of the SN10502. You can filter this list down even more using the columns on the left. OPA2830 is a good replacement device if slew rate is not a concern, otherwise look at the OPA2836 as well. 

    Thank you,

    Sima