• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 63 subscribers
  • Views 203 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LP38512-ADJ: Not getting the desired ouputput

Jagbir
Expert 1525 points
Part Number: LP38512-ADJ

Tool/software:

Hi,

I have an input supply of 5V and I am using two LP38512MR-ADJ/NOPB, in series to generate 3.3V and 1.1V

For the first LP38512MR(U11) , I am getting an output of 4.8V instead of a 3.3V. Is it a stability issue or we can not use two LP38512MR in series.

Thanks,

Jagbir

  • 0
    TI__Genius 13410 points

    Hi Jagbir,

    You can definitely use two LP38512MR in series.

    I have a few questions for you which will help me debug the issue you are facing:

    1. Is this issue observed in simulation or post board assembly in hardware testing?
    2. Could you please share a picture showing your test setup and probing location? A scopeshot showing VIN, VOUT and IOUT will help
    3. What is the load current?
  • 0 in reply to Ishaan Shetye
    Expert 1525 points
    1. Is this issue observed in simulation or post board assembly in hardware testing?

    Post board assembly in hardware testing

    1. Could you please share a picture showing your test setup and probing location? A scopeshot showing VIN, VOUT and IOUT will help

    Yellow= Iout, Green =Vin, Orange=Vout

    1. What is the load current?

    Less than 1A.

  • 0 in reply to Jagbir
    TI__Genius 13410 points

    As per the orange trace (VOUT at 2V/div), you seem to be getting 3.3V at the output. Could you show me where you are seeing 4.8V on the output or if I am reading something incorrectly from the scopeshot above?