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LM70880-Q1: Schematic review

Roy Chou1
Genius 16190 points
Part Number: LM70880-Q1

Hi Team,

May you help review the schematic for me? Vin = 24V, Vout = 9V/6A

Regards,

Roy

  • 0
    TI__Expert 3400 points

    Hello Roy,

    The product expert is out of office now. TI responses may be delayed during the year end holiday season until Jan 2nd, 2024. Thank you for your patience and happy holidays.

    Best wishes,

    Ryan

  • 0 in reply to Ryan
    TI__Genius 16190 points

    Ryan,

    I use the datasheet and EVM to modify the schematic. Please check the latest version after holiday.

    Regards,

    Roy

  • 0 in reply to Roy Chou1
    TI__Genius 17080 points

    Hi Roy, 

    I have checked the schematic. There are some problems and my suggestions are shown below. 

    1. Change R111 to 6mohm. Because the minimum value of Vcs is around 50mV, considering that ΔIL=0.2~0.4Iout(CL), so you can choose the R111=6mohm. 

    2. Change L105 to 6.8uH.

    3. Change C132 to 4.7uF.

    4. Change R127 to 41.2kohm to enable DRSS function.

    5. Change R122 to 49.9ohm. C141 do not maintain NC status, let it be 33pF.

    6. Customer can add a 49.9ohm resistor in front of R119 for measuring the loop. 

    Hope this can help. Thanks.

    Aurora