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Ripples in the output of DC-DC buck converter

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chviswanadh

chviswanadh

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Hello,

Can any body tell me what is the maximum allowable ripple voltage at the output of a DC-DC buck converter.

Thanks
Kasi
 

This depends of your design requirements, the ripple output is mainly a function of components quality. Input and output capacitors should be low ESR, and input should have Ims current at least half of maximum output current. Inductor should support a current at least 1.3 times of maximum output current. Catch diode should handle 1.2 times the maximum output current. If you select quality components with correct limits you have very low output ripple. Another inssue is output filter stability, the feedback should have a good phase margin.
The corrects values depends of frequency, if you are using a IC, like LM2596 this have all inssues for correct work ....

leomecma
 

    chviswanadh

    chviswanadh

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Hello Leomecma,

Thanks for the reply. We are implementing a PWM current controlled constant off time buck regulator. We are targeting at 0.18 um technology. We are using cadence spectre for the simulations. Since filter is an external component off the chip, we need to make sure that the chip is working fine until that stage. Is there any limit for the ripple voltage at the output before the filter stage.

Thanks
Kasi
 

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