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LM5176: Series Resistor on VIN

Jason Williams71
Prodigy 40 points
Part Number: LM5176

Hello, Under Typical Application in the datasheet a 10ohm resistor is placed in series with Vin but is not described elsewhere in the datasheet. This is also done on the TI eval boards. Is this resistor necessary, like the diode, if not using BIAS input? What is the purpose of this resistor?

Thank you

  • +1
    TI__Guru 65170 points

    Hello Jason,

    The purpose of this resistor together with the capacitor are filtering the noise on the VIN line coming from the power stage. It is layout dependent if it is necessary, but it is good design practice to have it there.

    Best regards,
    Brigitte