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UCC27322: UCC27322

Timothy Fuller
Prodigy 10 points
Part Number: UCC27322
Other Parts Discussed in Thread: UCC27614

Tool/software:

Hi,

I am a test engineer working for a test house. Recently a customer has contracted us to test some UCC27322DR devices.

I have developed a test solution on our Chroma 3650 ATE. I ran into some issues during the development and ordered a UCC27322 EVM board to verify my ATE test solution data.

All of the tests I am having issues with correlates well with the EVM board test data on the bench.

The devices we are testing have been supplied by the customer. I believe they are originated from Unitrode as they are marked differently than the current TI devices, I got for my ATE development.

Part are Marked:

Top:  27322           Bottom:  2D077

         U 1BM               

         AOYJ

Do you have any insight as to which marking is the date code and how to decipher into a date?

The customer supplied document for device screening has different electrical specification limits than the current TI data sheet (November 2023). It also has some electrical characteristics not listed in the current data sheet. I can't find an older Unitrode data sheet to compare with the customer document. Would you have access to an old Unitrode data sheet from around the time for the date code of this device, so I might compare with the customer data sheet?

I am using only DC test methods to test the Output Resistance High & Low. Will DC test methods correctly measure the PMOS only not the N-Channel Structure as mentioned in the data sheet?

I am also having issues with Enable VIH & VIL. I am using a DC ramp on these pins. Is there any precautions I need to take with these tests.

I would appreciate any insight you might have or document you could provide on this.

Thank you.

Regards,

Tim

  • 0
    TI__Expert 8790 points

    Hello Tim,

    The parts could have originated from Unitrode. UCC27322DR also continued to be marked with the unitrode markings for some time after being acquired by TI. 1B is a two digit date code corresponding to year and month. Assuming B mean the second month, the date could be Feb. 2001, 2011, or 2021. Attached are the datasheet revisions from both the 2001, 2011, and 2021 time framesslus504.pdfslus504e.pdfslus504h.pdf.

    The output structure may have changed between the old and newest part revision. The hybrid structure might make it difficult to get an accurate DC reading.

    A ramp input signal should not cause issues as long as the max and min voltage spec is not exceeded.

    Thank you,

    Walter

  • 0
    Prodigy 10 points

    Hi Walter,

    The information and previous data sheets were quite helpful. Thank you for getting back to me so quickly, I appreciate it.

    I have a couple of follow-on questions I hope you can address also.

    1.) You indicated there were older revisions of this device that might have different output structures. Do you have any insight into what the differences might be and how this could affect the output performance?

    2.) Do you have a time frame that the change occurred?

    3.) The older data sheets have VOH & VOL electrical characteristics specified for the Output. These are in my customers specifications also. Is it likely the hybrid output structures would make measuring these parameters difficult also?

    4.) Do you have any suggestions on a methodology ( either AC or DC testing ) I could use to more accurately measure these characteristics? 

    Thanks again.

    Regards,

    Tim

  • 0 in reply to Timothy Fuller
    TI__Expert 7650 points

    Hi Tim,

    I can help answer your questions while Walter is out of office today:

    The UCC27322 and its family of devices (UCC2732x and UCC2742x) received a PCN in late 2023. The older version of the device (pre-PCN) used to have a hybrid output structure, which is the one that Walter posted. The post-PCN version of the device now has a strictly MOSFET only pull-up and pull-down output stage:

    This new output stage results in a lower output turn-on and turn-off resistance, yielding faster and more efficient switching. I’m currently in the process of updating all the datasheets in the device family to account for this change that was missed in the latest revision.

    It is most likely the case that the EVM you ordered has the pre-PCN version of the device installed, thus the current datasheet parameters will not match up with your testing. Walter linked the previous revision of the datasheet, which would be more likely to match your test, but the customer will be receiving the post-PCN version when they order the devices.

    The user guide should explain the best way to test the device on the EVM, but if you have specific questions or need explanations on how to test certain parameters, please let me know and I’ll be happy to help.

    By the way, I would recommend looking into the UCC27614. The UCC27614 is pin-to-pin with the UCC27322, and it is part of the latest generation of standard low-side gate drivers, with most specs exceeding that of UCC27322.

    Thanks,

    Rubas