Capacitor Ripple Calculations Polyester

Elaborate capacitor | IC Designer

If the relatively large load capacitance, drive circuit capacitance must be charged and discharged, to complete the signal transition, when the rising edge of steep, relatively large current, so the current drive will be absorbed much of the supply current, the circuit inductance, resistance (especially chip pin inductance, will produce a rebound), this current phase, it is actually the normal kind of noise, will affect the normal work of the former class, which is called the “coupling” . Y capacitor connected to the two more critical position, you must need to comply with the relevant safety standards, cause electronic equipment to prevent leakage or chassis live, easy to endanger the physical safety and life, so they all belong to the safety capacitors, requiring relatively large capacitance value can not, The pressure must be higher. Typically, filter out interfering signals on the low-end needs of large-capacity filter capacitors, but subject to security constraints, Y and X capacitor capacitor can be used not large; filtering interference signals on the high end, high-capacity capacitor poor filter performance and, in particular, polyester film capacitor high-frequency performance in general than the poor, because it is produced by winding process, and the polyester film dielectric properties of high frequency response compared with ceramic or mica very different, General polyester film medium has absorption effect, it will reduce the frequency of the capacitor, polyester film capacitors in the frequency range of about 1MHz is about more than 1MHz its resistance will increase significantly.

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