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LM3488: The schematic diagram issue for LM3488

Zhang Liang
Genius 4165 points
Part Number: LM3488
Other Parts Discussed in Thread: TPS23861

Hi,

We use the LM3488 for the PSE power supply(PSE device is TPS23861), the input voltage is 12VDC, output voltage is 48VDC, the frequecy is about 200K, the MOSFET is FKBA6040, the inductance value is 15uH/ 14A;

Now, we touch the MOSFET and inductance when the power on, the temperature is more than 40℃, but we consider it is light load and this temperature is abnormal;

Please kindly review below schematic diagram and provide your comment for this design, thanks.

  • 0
    TI__Guru 58641 points

    Hi Zhang,

    thank you for using the E2E forum.

    Can you provide some more details:

    - what is the load when you say light load condition.

    - can you probe on some point in the circuit 

      - Output voltage - check if it is stable   (measure DC and AC)

      - Switch node (between inductor, diode and MOSFET)    (should show a several switching cylces)

      - Gate signal  (should show a several switching cylces)

      - Comp pin

    How is the behavior with normal load condition?

    Best regards,

     Stefan

  • 0 in reply to Stefan Schauer
    Genius 4165 points

    Hi,

    I will check it and feedback to you soon, thanks.

  • 0 in reply to Zhang Liang
    TI__Guru 58641 points

    Hi Zhang,

    I have not seen an update for the last 28 days, so I assume the questions are/or answered and the issue is solved.
    I close this thread now. If there is still something open reply and the thread will get open again.
    If you have any other question or of the thread gets locked, please open a new one.

    Clicking the Resolved Button also helps us to maintain this forum.

    Best regards,
    Stefan

  • 0 in reply to Stefan Schauer
    Genius 4165 points

    Hi Stefan,

    Thanks for your kindly support, we have solved this issue and please kindly close this thread.