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TPS55289-Q1: Question about dead time of TPS55289-Q1

Chase Jeong
Mastermind 7645 points
Part Number: TPS55289-Q1

Tool/software:

Dear TI experts,

My customer asked about dead time of TPS55289-Q1.

Customer's applicaton is highly dependant on switching efficiency, so dead time is very important.

Do you have any document or test results that there is definitely no dead time while TPS55289-Q1 is operating?

Please check this issue. Thanks.

Best regards,

Chase

  • 0
    TI__Mastermind 27970 points

    Hi Chase,

    TPS55289-Q1 can support switching frequency from 200kHz to 2.2MHz by programming Fsw pin resistance. The dead time exists with above switching frequency when device is operating. No issue.

    BRs,

    Bryce

  • 0 in reply to Bryce Xun
    Mastermind 7645 points

    Dear Bryce,

    Thank you for your support.

    You mean that dead time is essentially exists while TPS55289-Q1 is operating, but there are no issues related to switching efficiency?

    I thought that there might be some losses of efficiency if dead time exists while operating.

    Please check this issue. Thanks.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Mastermind 27970 points

    Hi Chase,

    I don't know what issue do you mean? 

    Dead time will of course exist otherwise the MOSFETs on the bridge would have shoot-through risks. It will cause some loss, but the loss is tiny compared with switching losses.

    BRs,

    Bryce