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TPS55289: Review the TPS55289 drawings sent to us by WEBENCH.

Kim JaeHyung
Prodigy 215 points
Part Number: TPS55289

Tool/software:

Dear sir,

I would like to have my circuit reviewed.
Q1) According to the REPORT sent by WEBENCH as an example., FB/INT PIN is floating.
      Shouldn't there be a feedback partial pressure resistor?

WEBENCH EXAMPLE SCH

Q2)  Where does the pattern on the drawing lead ?

ps) WEBENCH report is attached.

WBDesign48.pdf

Thanks,

Kim

  • 0
    TI__Genius 14950 points

    Hi Kim,

    Thank you for reaching out.

    1. Change Renb to 200kohm in case EN voltage is lower than threshold.

    2.Do you use I2C function? Make sure SCL and SDA are pulled to VCC.

    3.Recommend to use type II compensation. Add a paralleled cap in comp pin.

    4. Recommend to change inductor to 4.7uH with Isat>8A.

    5.Recommend to add RC snubber in SW1 and SW2. 330pF+2ohm(1206).

    6.Recommend to add 0402 0.1uF cap in Vin and Vout.

    7. If use I2C function no need to add divider resistor. You can choose internal divider and connect FB to VCC as fault indicator. If you choose external feedback, you need divider resistor.

    8. After you design your schematic, you can send to us to review. I will recommend compensation parameters accordingly.

    Regards,

    Mulin