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Q.Please explain the checkpoints for when the ripple and noise are high.

Power Supplies >  Switching Power Supply >  DC-DC Converters/ AC-DC Power Supplies

A. [Cause (1)] Input-output wiring:
Long wiring or wiring where the input and output are not isolated lead to the generation of noise.

[Cause (2)] The input voltage is low:
The ripple and noise increase when the input voltage becomes low.

[Cause (3)] The load current is high:
The ripple and noise increase when there is excessive load.

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