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LM7310: LM73100RPWR Active oring is not working as expected

Martin Vit
Prodigy 145 points
Part Number: LM7310

Tool/software:

We are using LM73100 configured as active oring, but circuits doesn't work as expected.

We have there two power path : Primary (U11) where VIN = 12.3V and secondary (U10) where is VIN = 12.1V.

Load current at the output is 1A. We expected that primary power path (U11) will be on and secondary (U10) will be off. But behavior is

exactly oposite. U10 is on. What are we doing wrong. Is that necessary to make bigger voltage difference between path? If we use standard schottky diodes like oring it works in our circuit. Many thanks

Martin / Kontron

  • 0
    Prodigy 145 points

    Hello,

    I just want to share, that finally I was able get power oring circuit working. The reason for wrong behavior was, that we didn't have 100nF decoupling caps close to pin 5 (IN) and 8 (GND). I added them with piece of wires and now our design is working as expected. See details in pictures,