Ripple contributes to constantly varying DC output voltages that produce pulsating content.
The ripple voltage fluctuation synchronizes with the switching frequency, producing an output voltage with superposition characteristics on the output voltage.
The capacitance of the input smoothing capacitor inside the power supply unit, the response speed of the amplifier, the switching frequency, the output filter, and the output current will determine the conditions of the pulsation components.
According to Japan Electronics and Information Technology Industries Association (JEITA) standard, ripple is defined as fluctuations consisting of frequency components at 50/60Hz, the same as AC power. In contrast to the ripple, noise is defined as fluctuations comprised of frequency components of several tens of kHz or higher caused by AC adapter switching.
Some ripple and noise component are contained on the output. When you need to stabilize the output voltage, using a power supply with low ripple noise is preferable.
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