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What is Output Voltage Ripple?

Ideally, a buck regulator would convert a perfect noise-free DC voltage to a perfect noise-free lower DC voltage. However, every switch-mode power supply has output voltage noise due to components within the supply switching on and off. Ripple is typically at the fundamental frequency equal to that of the PWM controller’s switching frequency. Usually, the output voltage ripple will be a small percentage of the DC output voltage, but even small amounts may have an adverse effect on sensitive downstream circuitry. Output voltage ripple is normally represented as peak-to-peak voltage. A few examples of things that can affect output voltage ripple include switching frequency, layout, capacitance, and equivalent series resistance (ESR).

PTM Published on: 2020-10-01