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LM5176: schematic check

Part Number: LM5176

Hi

could you help  check the LM5176 schematic as below and any need to adjust ,Thanks

  • Hello Gareth,

    Please excuse the late response.

    I reviewed the schematic with the following parameters in mind:

    VIN = 12V to 24V
    VOUT = 12V
    IOUTmax = 11A

    Here the comments to the schematic:

    - Peak inductor current is 30A. Please check if the saturation current is high enough for this inductor.
    - Please check the voltage on R17 at full load. The voltage drop should be below the minimum value of the sense circuit.
    - Please add bulk capacitance at the input. At the moment it seems only ceramic caps are there which will cause issues during startup into the 600+uF on the output.
    - The customer is not using the UVLO feature, so the converter will start at a much lower voltage than the 12V which means the whole design would need to be done for this low voltage. Please either digitally enable the device and then add a resistor to GND on the EN pin or use the UVLO function for 11 V at least.
    - I would recommend to add placeholders for gate resistors as well as snubbers on Q5 and Q4, in case they are needed.

    Best regards,
    Brigitte

  • Hi Brigitte

    Thanks you

    Peak inductor current is 30A. Please check if the saturation current is high enough for this inductor. Currently I use this inductor to verify (saturation current 25A)
    - Please check the voltage on R17 at full load. The voltage drop should be below the minimum value of the sense circuit.
    OK, it is under 50mV
    - Please add bulk capacitance at the input. At the moment it seems only ceramic caps are there which will cause issues during startup into the 600+uF on the output.
    OK, modified
    - The customer is not using the UVLO feature, so the converter will start at a much lower voltage than the 12V which means the whole design would need to be done for this low voltage. Please either digitally enable the device and then add a resistor to GND on the EN pin or use the UVLO function for 11 V at least.
    OK, modified
    - I would recommend to add placeholders for gate resistors as well as snubbers on Q5 and Q4, in case they are needed.
    OK, modified