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Original question:

LM4950: About P17 "POWER SUPPLY BYPASSING" of the data sheet.

LM4950: About P17 "POWER SUPPLY BYPASSING" of the data sheet.

user6213590
Prodigy 120 points
Part Number: LM4950

Ivan Salazar,

Sorry for the late response.
For example, what is the impact of using the following capacitors?

(1) GRM21BC8YA106KE11
psearch.en.murata.com/.../GRM21BC8YA106KE11#.html

(2) GRM32EB31E226KE15
https://psearch.en.murata.com/capacitor/product/GRM32EB31E226KE15%23.html

Best regards,
Jungo

  • 0
    TI__Guru* 84915 points

    Hi, Jungo,

    The 10uF capacitor is a good choice as decoupling capacitor. If placed near of the power supply pin, the lower frequency ripple will be correctly mitigated. However, I would replace the 22uF capacitor for a 0.1uF capacitor. The 10uF capacitor is enough for the low frequency noise content, but you would need to reduce the high frequency content with a 0.1uF capacitor.

    In addition, as stated in the datasheet, you would need to consider a 1uF tantalum capacitor.

    I hope this helps you. Please let me know if you require additional support on this.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 120 points

    Hi, Luis,

    Thank you for your response.

    I want you to see the original question (LM4950: About P17 "POWER SUPPLY BYPASSING" of the data sheet).
    I asked Ivan Salazar the following and he said you can use X7R or at least X5R capitalists.

    > tantalum bypass capacitance is written that the necessary to connect between the LM49507s supply pins and ground.
    > Please teach the method of not using the tantalum bypass capacitor for me.

    My question is to see what happens when the following capacitors are used instead of tantalum capacitors.
    I would like to know if using the following capacitors will lead to AMP degradation or AMP destruction.
    According to the DC bias characteristic, GRM32EB31E226KE15 is 8.8uF at 12V.

    (1) GRM21BC8YA106KE11
    psearch.en.murata.com/.../GRM21BC8YA106KE11#.html

    (2) GRM32EB31E226KE15
    psearch.en.murata.com/.../GRM32EB31E226KE15#.html

    Best regards,
    Jungo

  • 0 in reply to user6213590
    TI__Guru* 84915 points

    Hi, Jungo,

    Thank you for your clarification.

    I think these capacitors would work correctly even with the DC bias derating. If you use a power supply level of 12V, the capacitors will be reduced to 2uF (from originally 10uF) and 10uF (from 22uF originally). 

    Best regards,
    Luis Fernando Rodríguez S.