• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 212 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.

LM2594: Connecting the outputs of two LM2594 in parallel

Danilo A.
Mastermind 24715 points
Part Number: LM2594
Other Parts Discussed in Thread: LM2595

Hi Team,

We have a customer planning to use two LM2594. He plans to connect the outputs (load side of the coil) in parallel. The first LM2594 will be connected from an external power source while the second one from a battery. Is this configuration safe?

Regards,

Danilo

  • 0
    TI__Mastermind 22299 points

    Danilo,

    We dont recommend connecting two free-running LM2594 for current sharing.

    These devices do not have this functionality and can go unstable in this configuration.

    If you need 1A we recommend a 1A converter like LM2595.

    However, if you need this for redundancy, then you will need to place a diode on the output voltage of the backup LM2594.

    The backup converter should have it's own output capacitor COUT and the diode should be placed "after" COUT. 

    Maybe adjust the setpoint to somewhat compensate diode voltage drop.

    Also if VOUT > VIN, there will be conducted reverse current through the converter and this can damage the device if one of the VINs  is OFF.

    You will have to also place diodes on VIN to prevent reverse current. Use low Vf diodes for best efficiency.

    Hope this helps, let me know if you have further questions.

    -Orlando

  • 0 in reply to Orlando Murray
    TI__Mastermind 24715 points

    Hi Orlando,

    Thank you for your clear explanation and advice.

    Regards,

    Danilo