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TPS55288: schematic review

Jeff YANG
Genius 4620 points
Part Number: TPS55288

Hi

We have occur OCP issue, TPS55288 INT pull low when connect 5V/3A device, we are checking for output current.

Please help check if below schematic have any need modify.

Thanks!

Jeff

  • 0
    TI__Genius 16920 points

    Hi Jeff,

    May I know what is the customer and the application here? And what is the input voltage, output voltage and output current?

    Please notice that when SCP/OCP/OVP bit is set, then INT pin will output low. Please probe SW1, SW2, Vout and the inductor current waveform to see if any protection is triggered.

    BRs,

    Bryce

  • 0 in reply to Bryce Xun
    Genius 4620 points

    Hi Bryce,

    We found using e-load drain 2.8A trigged OCP, setting is 3A. would you please help review layout file is sensing resistor trace if need modify?

    Thanks!

    Jeff

  • 0 in reply to Jeff YANG
    TI__Genius 16920 points

    Hi Jeff,

    It is recommended to add the resistors and filter capacitor between ISP and ISN pins, so the output current sense could be more precise. What about the current limit at Buck mode?

    And also considering the spec of ISP-ISN current limit voltage has variation, it is better to leave some margin for output current protection threshold.

    What is the max output of TPS55288? 20V/3A for 60W? Mulin will share more comments about the schematic and layout.

    BRs,

    Bryce

  • +1 in reply to Jeff YANG
    TI__Intellectual 2135 points

    Hi Jeff,

    Below is my feedback about schematic:

    1.Recommend to change R79 and R80 to 0ohm.
    2.Remember to connect SCL and SDA pin to VCC with 2.2kohm resistor.
    3.Add RC filter as Bryce suggest. 
    4.Recommend to add several ceramic capacitors in the Vout pin (for example, 10uF*3 as EVM). This can reduce output voltage ripple and can increase output current accuracy.
    5.Recommend to add a 0402 0.1uF ceramic capacitor in Vout pin and put it as close as to the chip.

    About the layout, please see the attached file.TPS55288 layout reiview 20240116.pptx

    Regards,

    Mulin

  • 0 in reply to Mulin Yuan
    Genius 4620 points

    Hi Mulin,

    Very appriciate for your help.

    Jeff