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TPS7A94: I am not getting the 0.5V output from the TPS7A94 device. I am getting 2.2V . I need 0.5V output.

Kesavulu Manne
Prodigy 10 points
Part Number: TPS7A94

Tool/software:

Hi Sir,

Regarding the output from TPS7A94 device, we need 0.5V output, but i am getting 2.2V.

I have used below schematic diagram for the reference. 

I have changed the R6 value from 22k to 3.3K for the output of 0.5V.

Could you please provide the proper values to get the 0.5V output from TPS7A94 device.

Best Regards,

Kesav

  • +1
    TI__Genius 13390 points

    Hi Kesav,

    Your chosen 3.3k R6 value should provide 0.495V at the output.

    Do you have a schematic for your design aside from the EVM schematic above?

    If not, I have a few questions - what is Vin in your application? Is SNS connected to vout?

    Can you confirm voltages at the following points: Vin, Vout, NR/SS (across R6 in the schematic above), pin 8 (SNS) of the LDO. 

    Best Regards,

    Alex Davis

  • 0 in reply to Alex Davis
    Prodigy 10 points
    Hi Alex,
    Thank you for your reply.
    Please find my comments below in blue color.
    The below is the LDO board schematic diagram.
    I have used EVM schematic for my requirement only changed the R6 value
    Yes, SNS is connected via zero ohm resistor. Vin is 3V

    Vin : 2.759V

    Vout : 2.212V

    NR/SS : 2.211V

    at Pin 8 : 2.211V

    Please provide the correct values to get the 0.5V on output.

    Best Regards,

    Kesav

  • 0 in reply to Kesavulu Manne
    TI__Genius 13390 points

    Hi Kesav,

    I would suggest double-checking connectivity on R7 - with 2.211V on the NR/SS pin, the output voltage of 2.211V is correct. The high voltage at the NR/SS pin suggests that R7 isn't the correct value (3.3kΩ, as you calculated), or that it's damaged or not connected. 

    Best Regards,

    Alex Davis