• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 144 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.

Original question:

LMR50410-Q1: Switcher circuit not working correctly

LMR50410-Q1: LMR50410Y3FQDBVRQ1

Krithica Ramswami
Prodigy 10 points
Part Number: LMR50410-Q1

Tool/software:

we have connected the circuit as per datasheet, our input voltage is 5V which we have given through USB and that is reflecting in the input side, but for the output side we need a voltage of 3.3V, the feedback resistors are 51K and 22.1K as per the datasheet, at the 3rd pin we are getting 1.5V but output we get 5V, when we check with other supply voltages, 6V input 6V output and so on till 11V input, then till 20V input the output we get is 11V 

Please help us rectify this issue

  • +1
    TI__Mastermind 24115 points

    Hi,

    The device you are using is the LMR50410Y3FQDBVRQ1 and has a fixed voltage. For fixed voltage output LMR50410-Q1 device, the FB pin must be directly connected to the output point and not through a resistor ladder. If you would like to keep your resistor ladder, you would have to switch to the LMR50410YFQDBVRQ1 version of the device.

    Thank you,

    Joshua Austria