• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 612 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

TPS7A52: TPS7A5201

Lorant Bugar1
Prodigy 60 points
Part Number: TPS7A52

Hi,
I have a problem with TPS7A5201 layout.
Schematic is attached. Input voltage is 4.2V and output voltage is set with R13 and R14 to 3.8V.
If layout is not loaded works good, I measure stable 3.8V on output.

But if I add load 500mA, output voltage drops down to stable 3.5V. If I add 1A load output voltage drops to 3.2V .... If I add full load 2A output voltage is 2.5V.
I tried to add larger input capacitors 3x 22uF and output capacitors 3x22uF but the problem remains.

Please help.

Thank you

  • 0
    TI__Genius 16606 points

    Hi Lorant,

    I am thinking that your device might be in thermal shutdown. I cannot be sure without probing all the inputs and outputs. 

    On a scope, what does your input, output, and current look like? 

    Is the input stable or does it change with the current?

    Possibilities are:

    - If the output is oscillating, the device may be in thermal shutdown.

    - The current actually being drawn might be higher than what the device is rated for and the device is going into constant current. 

    Please let me know. 

    Best,

    Juliette