• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 111 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.

LM5122: IC output during standby and shutdown conditions

anusha kodali
Prodigy 60 points
Part Number: LM5122
Other Parts Discussed in Thread: LM5155

Tool/software:

LM5122 Boost regulator is in OFF(either shutdown or standby mode), why the output is getting 12V(for 12V input). Is there any chance to get output as 0V.

  • 0
    TI__Mastermind 30140 points

    Hi Anusha,

    Thanks for using the e2e forum.
    In a boost topology, input and output are directly connected through the inductor and high side switch.
    Even if high side switch is turned off, the connection is still given through the body diode of the FET.
    Hence, the output voltage will always follow the input voltage, even if the device is turned off.

    To keep the output at 0V during off time, isolation is required.
    A flyback or SEPIC topology can be used for this. Here we recommend asynchronous controllers like LM5155.

    Can you give me the parameters for VIN, VOUT and maximum load for this application?
    Based on this we can give the best suitable device proposal.

    Best regards,
    Niklas