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This article describes how to calculate the output ripple voltage of a DC-DC converter.
Assuming that all the ripple current ΔIL flows through the output capacitor, the ripple voltage ΔVo is as follows.
The ripple voltage Vrp generated for a capacitance C of the capacitor is as follows.
The voltage Vesr generated in the ESR of the capacitor is as follows.
To suppress the ripple voltage due to ESR, a ceramic capacitor with low ESR can be connected in parallel to reduce Resr, which is effective in suppressing ripple.
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