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UCC28950: UCC28950PW alternative

Gerald
Genius 9570 points
Part Number: UCC28950
Other Parts Discussed in Thread: UCC28951, , UCC2895, UCD3138

Hi Experts,

May I ask for help? Our customer is loolking for UCC28950PW because it is out of stock.
Considering availability, I check and compare other devices in this link: Compare products (ti.com)
Unfortunately, our customer need a controller that operates at 50KHz. Will the compared devices work? or do you know a better alternative that is available?
Kindly let me know. Thank you so much in advance.

Kind regards,
Gerald

  • +1
    TI__Guru* 85646 points

    Hello,

    The UCC28951 is parametrically identical to the UCC28950 it only can get 1 to 2% more duty cycle it should work for your application.

    Sorry about the semiconductor shortage.  Many customers are experiencing the same issues.  

    If the UCC28951 is not available the UCC2895 is an older device for PSFB converters.  

    Regards,

  • 0 in reply to Mike O'
    TI__Genius 9570 points

    Hi Mike,

    Thank you so much for your support. Kindly be informed that we still got a response from our customer as shown below:

    "I understand. My problems is that the converter use at secondary high volgage SiC
    diode for rectify, for this the switching frequency cannot be very high,
    in order to reduce the switching losses.
    In alternative, can you propose a microcontrolelr or similary in order
    to realize the dedicated control circuit?"

    I hope you can further help us. 

    Kind regards,

  • +1 in reply to Gerald
    TI__Guru* 85646 points

    Hello,

    In TI's portfolio for analog control ICs we don't have anything that operates at a lower frequency.  However, the digital power team has done a phase shifted full bridge design with the UCD3138.  I found the firmware below for the controller.

    https://www.ti.com/tool/UCD3138FW-PSFB

    I don't know the details of this digital controller or who supports it.  Could you start a new thread with UCD3138 in the title asking what the minimum switching frequency is?  This was the appropriate engineer that supports this device can support you.

    Regards,