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LM723: Cref issue

Jon Hildenstein
Prodigy 10 points

Part Number: LM723

Tool/software:

Hello. Is there any advantage to using a Cref capacitor bigger than the 5µf specified in the datasheet of the LM723? I have seen some designs using much higher values. 

  • 0
    TI__Genius 15141 points

    Hi Jon,

    Thank you for asking us!

    A larger Cref will provide better PSRR (especially at low frequencies) and noise compared to a smaller one. A larger Cref may be paired with a smaller Cout for the same PSRR performance. 

    The other reason to use a larger nominal value is with a worse rating is to keep effective capacitance above a minimum across the operating region, mainly for cost reasons.

    It is not necessary, and the device will work perfectly fine even without one.

    Best,

    Gregory Thompson