• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 3 answers
  • Subscribers 65 subscribers
  • Views 835 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.

UCC27211A-Q1: can it support over 1MHz frequency?

Chase Jeong
Mastermind 6170 points
Part Number: UCC27211A-Q1
Other Parts Discussed in Thread: UCC27211, UCC27517A-Q1, LMG1210, LMG1205, UCC27211A, UCC27289

Hello TI experts,

My customer want to design the amplification circuit using half-bridge driver and MOSFET.

they drew a diagram for the convenience. please see the diagram below;

As you see there is UCC27211A-Q1 after 2 logic ICs.

the problem is originally generated signal is PWM over 1MHz to 3 MHz.

can you verify this diagram especially focus on the PWM frequency for UCC27211A-Q1? I cannot find ant data about this on datasheet.

(i already confirmed 2 SN74LVC ICs to another expert. it have no problem with high frequency over 1MHz to 3MHz.)

if it does now work, please recommend some ICs to replace.

please check this issue. Thanks.

Best regards,

Chase

  • 0
    TI__Mastermind 22275 points

    Hello Chase,

    Thank you for the diagram, I see that the gate driver is being used as a low side driver which the UCC27211 can support, but confirm if the gate drive output will be driving a MOSFET referenced to ground only as shown in the diagram.

    For this high frequency operation, I would recommend using a low side driver which have been tested and used in applications in the frequency range you mention.

    A small low side driver I would recommend that has the same driver current as the UCC27211 is the UCC27517A-Q1. This device has been use in high frequency applications at least up to 4MHz.

    The datasheet can be found at the link below.

    https://www.ti.com/sitesearch/docs/universalsearch.tsp?searchTerm=ucc27517A-Q1#src=top&linkId=1&q=ucc27517A-Q1&firstQueryCause=searchFromLink

    Confirm if this addresses your questions, or you can post additional questions on this thread.

    Regards,

  • 0 in reply to Richard Herring
    Mastermind 6170 points

    Hello Richard,

    Thank you for your reply.

    in fact I got email from customer, the block diagram was little changed.

    could you check the diagram below;

    as you see 1 FET added for half-bridge amplifier.

    can you check one more time that still UCC27517A-Q1 is valid for this diagram?

    or should I use another gate driver?

    please check this issue one more time. Thanks.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Mastermind 22275 points

    Hello Chase,

    The latest diagram you provided, does make it necessary to have a half bridge gate driver such as the UCC27211.

    For this high operating frequency though, I would suggest looking at a driver targeting GaN devices but can drive Mosfets with 5V gate to source voltage.

    The LMG1210 or LMG1205 are half bridge gate drivers targeting high frequency operation with GaN transistors. But can be used with standard MOSFETs that are rated for 5V Vgs gate drive.

    It looks like the input voltage is not high so finding 30-40V MOSFETs that are compatible with 5V drive is not difficult.

    Confirm if this addresses your questions, or you can post additional questions on this thread.

    Regards,

  • 0 in reply to Richard Herring
    Mastermind 6170 points

    Hello Richard,

    Thank you for your reply.

    i checked GaN devices that you said, LMG1210 and LMG1205. they are pretty expensive than UCC27211A.

    and back to the start, can i use UCC27211A for this situation? I think LO and HO can drive the MOSFET, but i am not sure that it might work on high frequency such as 3MHz.

    and I also found UCC27289, also i am not sure about operating frequency.

    could you please check this issue? Thanks.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Mastermind 22275 points

    Hello Chase,

    For high frequency operation, I would recommend the UCC27289 over the UCC27211A. This is mainly due to the improved narrow pulse performance and lower propagation delays in the UCC27289 compared to the UCC27211A.

    I did confirm with quick bench test that the UCC27289 has no issues with operating at 4MHz.

    In the application, you need to confirm the gate drive power since you are operating at high frequency. The gate drive power is VDD x Qg (total) x fsw. For the Qg total make sure you include both LO and HO outputs MOSFET gate charge.

    Confirm if this addresses your questions, or you can post additional questions on this thread.

    Regards,