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TPS79801 capacitor question

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Todd Solak
Posted by Todd Solak
on Apr 02 2012 14:06 PM
Intellectual1065 points

Can you answer a question for me about the TPS79801?  The datasheet states to use a 100pF capacitor (C1) across the top feedback resistor.  There is also a requirement to keep the impedance of C1 at 10kHz lower than the value of R2.  (For C1=100pF, Zc1 = 1/(2*pi*10kHz*100pF) = 159KOhm.  I want to know if it’s OK to scale C1 and R2 to get more current flowing through R2 to improve noise immunity.  For example, C1 = 560pF and R2 = 33.2k?

Page 11-12 of the datasheet is below:

 1680.TPS798xx.pptx

 

 

 

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  • Michael Day
    Posted by Michael Day
    on Apr 02 2012 15:09 PM
    Mastermind36070 points

    Yes, you can scale the resistors and capacitors. It's the poles and zeroes that are important, not the absolute value of the resistor and capacitor values.

    TPS79801 cff
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