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SN6501: Vin supply under the specified value of 3V

Philippe Baselgia
Prodigy 10 points
Part Number: SN6501
Other Parts Discussed in Thread: SN6505A

Hi,

Do you have further information abot the minimum Supply Voltage of the SN6501? I am Currently using the SN6501 with 2.6V supply (Instead of 3V) and it`s working perfectly fine. It even worked down to 2.2V.

Is this 3V minimum Supply Voltage just to guarantee all the specifications? I would really like to use this driver but I am unsure if I will get problems with other batches in the future.

 Please advise. Thank you very much.

Philippe Baselgia

  • 0
    TI__Genius 12760 points

    Philippe,

    are you aware that SN6505x has "Wide input voltage range: 2.25 V to 5.5 V"?

    Regards,

    Bernd

  • 0 in reply to BO
    Prodigy 10 points

    Hello Bernd,

    I have seen that the SN6505A/B has a wider input range. Unfortunately the average supply current is much higher.
    Therefore I would prefer the SN6501 becuase of the very low average supply current (typ. 150 uA).

    Regards, 

    Philippe

  • 0 in reply to Philippe Baselgia
    Prodigy 10 points

    But thank you for you recomendation.

    Regards,

    Phuilippe

  • 0 in reply to Philippe Baselgia
    TI__Mastermind 49415 points

    Hi Philippe,

    Thanks for reaching out.

    The device is designed to support operation from VCC voltage of 3V to 5.5V as stated in the datasheet. When supply voltage is <3V, it doesn't immediately stop working rather it can stop working at any voltage <3V. You might find that typical device might work fine for much lower voltages than 3V while a worst-case device might stop working right below 3V. Hence, to guarantee device operation across units and across temperature, we recommend you not use the device for any voltage <3V.

    I hope this answers your question, thanks.


    Regards,
    Koteshwar Rao

  • 0 in reply to Koteshwar Rao
    Prodigy 10 points

    Hello Koteshwar

    This helps me a little further. Unfortunately, I would very much like to use this component because of the high efficiency that I have achieved with it. Is the minimum supply voltage possibly dependent on the load that pulls it to GND? I am currently using the component with the Würth 750317331 transformer and my load is very low (15mW input power).

    If available further Supply Voltage information would be appreciated.

    Regards,

    Philippe Baselgia

  • 0 in reply to Philippe Baselgia
    TI__Genius 14030 points

    Hello Philippe,

    It is possible that the load could impact the supply voltage, but regardless of how low the load is we unfortunately can not guarantee that the device will function as expected unless the supply voltage is greater than or equal to 3V. Design and testing/validation of the device were completed with and verified for supply voltages of 3V to 5.5V, which is why we recommend this range be used. Do you have specific supply voltage information in mind? Since all testing is done within the recommended limits of our devices, we don't have any data or information on behavior outside of those ranges.

    Regards,
    Darrah

  • 0 in reply to Darrah Merillat
    Prodigy 10 points

    Hello Darrah

    Thanks for your answer. The intended supply voltage for the SN6501 would be 2.6V.

    It prperly worked for design tests but as you mention I am afraid that it won`t when I get another batch of SN6501.

    Regards,

    Philippe

  • +1 in reply to Philippe Baselgia
    TI__Genius 14030 points

    Hello Philippe,

    We unfortunately don't have data on the SN6501 behavior at a supply voltage of 2.6V, so we can not say how likely it is that another batch will work using the same design. Due to part to part variation, some devices may work as expected at 2.6V, while others will not, but there is no way to quantify or predict this. It is recommended to either increase the supply voltage to be between 3V and 5.5V or use an alternative device with a wider supply voltage range.

    If you need any help transitioning your design to another device or different supply voltage, we would be happy to offer support.

    Regards,
    Darrah