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LM51571-Q1: Schematic review

Ivy Jin
Expert 4545 points
Part Number: LM51571-Q1

Tool/software:

Hi Team,

Could you please help review the schematic and give some comments? Thanks in advance.

VIN min=2V, Vout=12V, Iout>50mA;

VIN=12V, Vout=30V, Iout>30mA.

Regards,

Ivy

  • 0
    TI__Genius 15575 points

    Hi Ivy, thanks for reaching out.

    I will do a review and come back to you by the end of the week.

    Best regards

    Moritz

  • 0 in reply to Moritz
    TI__Genius 15575 points

    Hi Ivy,

    How can i understand the specs?

    Ivy Jin said:

    VIN min=2V, Vout=12V, Iout>50mA;

    VIN=12V, Vout=30V, Iout>30mA.

    Does it mean it has to work under both conditions?

    For Vin=2V Vout=12V, the inductor value is too high and will allow nearly no current ripple. Also the duty cycle will be very high and close to the maximum duty cycle at this switching frequency.

    For Vin=12V, Vout=30V the schematic seems to be ok.

    Just R15 should be 5ohms instead of 5k ohms.

    Best regards

    Moritz