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UCC2581: recommended alternate

SRB
Intellectual 830 points
Part Number: UCC2581

Hello,

Is there a newer alternative to the UCC2581? Specifically for low power (200mW-3W) flyback operation.

  • 0
    TI__Mastermind 32775 points

    SRB,

    Thanks for your interest in low-power flyback controllers. TI is not offering an alternate to UCC2581 but does have a line of integrated isolated bias (IIB) converter modules that are in the power range you are asking. These are IC level packaged isolated DC-DC converters and you can view them here. Let me know if these are interesting to you or you still want to design your own flyback you can see the full line of available TI controllers here?

    Regards,

    Steve

  • 0 in reply to Steven Mappus1
    Prodigy 50 points

    Hi Steve,

    The page you pointed me to covers a whole range of products.  Is there one in specific that would be a good fit for what I need.  I want to create an isolated power supply that can deliver 3.3V, 3W using an input voltage that can range between 9 and 36V.  The efficiency needs to remain above 80% for loads between 800mW and 3W.  I was able to achieve that with UCC2581.  If there's another chip that can produce this, I want to know about it.  Otherwise, I find it sad that UCC2581 doesn't have a replacement.  It is a 20 year old chip and I'm worried about using it again for our next cycle of products.

    Regards,

    Daniel

  • 0 in reply to DANIEL PATENAUDE
    TI__Mastermind 32775 points

    Daniel,

    UCC2581 is still active but to address your concern about UCC2581 longevity you can view TI Product Life Cycle policies here. Back when UCC2581 was developed, there was not such a market demand for low power isolated conversion as we are now experiencing. The low power application you are describing as operating from 9V<VIN<36V falls into a niche that has resulted in numerous low-power, isolated, bias converter solutions. Responding to market needs, trends seen in the industry and customer system requirement, TI is heavily invested in developing leading edge solutions in this unique power area.

    Flybacks still have their place but are giving way to smaller solutions with higher integration and more protection/performance feature solutions than can be offered by a flyback solution.

    One path TI is heavily committed is in the area of IIB which I already mentioned previously. Another popular solution trend is a transformer driver approach. TI has a portfolio of open loop transformer drivers targeting applications such as you described. Because they are unregulated (open loop), they require a non-isolated pre-regulator such as buck/boost/SEPIC. You can check out the transformer driver portfolio here.

    Should be no worries to continue with UCC2581 but I just wanted you to be aware of how product offerings at this power level are progressing.

    Regards,

    Steve