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TPS2121: Schematic review

narendar reddy
Prodigy 210 points
Part Number: TPS2121

Hi TI,

Kindly check the following schematic, my requirement is both inputs are 5v , manually select either input 1 or input 2 by jumper setting, kindly help me out 

  • 0 in reply to narendar reddy
    TI__Genius 10652 points

    Narendar, 

    Can you please upload the image again because it is not showing up

    Never mind, i see the PDF link. Apologies.

    OV level is set to trigger when input is ~5.5V. 

    I also suggest to add at least 10uF of bypass caps on each of VIN1/2

    Secondly, what is the reason you are using 5M resistors on each of VIN/VOUT? That is an incredibly high value and you wont even get a microamp with VOUT shorted to ground. Please check this value and advise. 

    Finally, While you can certainly use a jumper you are also able to connect the PR1 to MCU. I'm not sure how valuable a jumper would be apart from testing. But i dont exactly know how you plan to use this, and jumper will work fine. SO that part is not really an issue if thats what you need for yoru design. 

    Please let me know if this answers all your questions by pressing the green button. 

    Best

    Dimitri

  • 0 in reply to dimitri james
    Prodigy 210 points

    Hi Dimitri,

    Apologies for my question, in my case,

    1.Both inputs are +5v only,

    2.Device operates in manual mode(By selecting 1,2 & 2,3 jumper setting)

    3.At  inputs i have connected 5 milli Ohm resistors 

    So finally if i connect 1,2 pins in jumper one input should be activate, on the other hand, for jumper 2,3 another input should come, kindly help me

    Thanks in advance,

    Narendar 

  • 0 in reply to narendar reddy
    TI__Genius 10652 points

    Narendar ,

    narendar reddy said:

    So finally if i connect 1,2 pins in jumper one input should be activate, on the other hand, for jumper 2,3 another input should come, kindly help me

    This is correct. 

    Please press the green button if this answers your question. 

    best

    dimitri