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LM3102: LM3102 Inductor selection

Stephan Hilchenbach
Intellectual 495 points

Part Number: LM3102

Hello DC/DC Experts,

we are using the LM3102 for our 3.3V and 5V power supply. According to the datasheet an inductance of up to 25µH is recommended. Is it a good idea, to use a 100µH inductance to reduce the current ripple and the output ripple to a minimum value?

Thanks in advance,

Stephan

  • +1
    TI__Expert 3910 points

    Hello Stephan,

    For COT devices, ripple can be necessary for driver performance, due to the phase delay between current and voltage in capacitors. Your application may work with a 100uH inductor because this device has internal ripple injection to the feedback loop, but this is not something I have data on. It is a good idea to also use an electrolytic capacitor on the output if you are not already, as the ESR can improve the control performance.

    Regards,

    Hardit Singh