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TLV627432: adjust Vout rather than Vsel settings

Given Ding
Genius 9015 points
Part Number: TLV627432

Hi Team, 

currently customer use Vsel1,Vsel2,Vsel3 to achieve 1.8Vout using TLV627432. And they want to change Vout to 1.84V, is it possible to connect a resistor between Vout and Vos to adjust the Vout? 

I see there is internal resistor divider programmed by Vselx so I think it should be OK but I'm not sure about the value of the resistor between Vout to Vos. Please kindly add your comments. Thanks. 

BRs

Given 

  • 0
    TI__Expert 7605 points

    Hi Given,

    Thank you for your question.

    The device has DCS control, and the VOS pin is used for both the current and voltage loop in a complex way. It is not a simple voltage sense (for example similar to the FB pin).

    Therefore, the output cannot simply be adjusted inserting a resistor. The addition of this resistor could also heavily compromise the control loop, thus this is NOT advised by TI.

    Thanks,

    Stefano

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

  • 0 in reply to Stefano Panaro
    TI__Genius 9015 points

    Hi Stefano，

    Thanks for your reply. Then is there any method to adjust Vout? Thanks.

    BRs

    Given

  • 0 in reply to Given Ding
    TI__Expert 7605 points

    Hi Given,

    Unfortunately for TLV627432 you cannot select a voltage level outside of the output voltage settings.

    Since 1.84V is a not common value, I think that the best option could be to choose a device with FB pin instead of VOS pin and to use the standard feedback divider, but that would definitely increase the solution size and I don't think it would be p2p compatible with TLV627432 .

    Btw, why does the costumer wants to modify the voltage from 1.8V to 1.84V?

    Are they trying to compensate for a voltage drop at the output?

    Thanks,

    Stefano

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).