• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 66 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.

LM317: LM317 Parallel configuration support

Agxin Justin xavier
Intellectual 410 points

Part Number: LM317

Hi 

I am trying to use Two LM317 in current sharing mode but Is this mothod of using two LM317 in parrlel on the power path will have any issues with current Hogging ? Do we need Hogging resistor ?

 

image.png

  • 0
    TI__Genius 9780 points

    Hi Agxin,

    I actually think this will work without the resistors R323 and R319 (see simplified below). Each LM317 will independently regulate the voltage across its OUTPUT-to-ADJUST resistance, and current will be shared as equally as the resistance.

    Ballast resistors after the adjust connection are not necessary in this configuration. Parallel voltage regulation benefits from ballast resistors because performance is best when the currents are shared equally. In current regulation mode, the currents themselves are independently regulated and summed together (KCL) at the output node, and there is no requirement that the voltage at each output pin (that independently compensates for each current) is the same.

    Best,

    Gregory Thompson