Capacitor Application Report

What are the selection considerations of output capacitors?

This application note describes the selection considerations of output capacitors, based on load transient and output impedance of processors power rails. Presently, there are no specific tools available for non-Intel processor output capacitors selection in multiphase designs.

What are the different applications of capacitors?

Let us see the different applications of capacitors. Some typical applications of capacitors include: 1. Filtering: Electronic circuits often use capacitors to filter out unwanted signals. For example, they can remove noise and ripple from power supplies or block DC signals while allowing AC signals to pass through.

How to select input capacitors?

The first objective in selecting input capacitors is to reduce the ripple voltage amplitude seen at the input of the module. This reduces the rms ripple current to a level which can be handled by bulk capacitors. Ceramic capacitors placed right at the input of the regulator reduce ripple voltage amplitude.

How do I choose a capacitor?

Depending on what you are trying to accomplish, the amount and type of capacitance can vary. The first objective in selecting input capacitors is to reduce the ripple voltage amplitude seen at the input of the module. This reduces the rms ripple current to a level which can be handled by bulk capacitors.

How to design a feedforward capacitor?

The traditional method of designing with a feedforward capacitor is to add an external capacitor (Cff) in parallel with the high-side feedback resistor, R1 in Figure 1. The capacitor value is chosen based on the values of the feedback resistors to place the geometric mean of the pole and zero at the unity gain crossover frequency.

How do you test a capacitor metallization film?

Photography of the capacitor film at 25m into the capacitor roll of Cap 10 in the test Group 1. Microscopy images of the metallization film from a new capacitor and from a tested capacitor (the scale bars represent a distance of 200 μm). Model and impedance characteristics of capacitors. The principle of ESR estimation.