Noise Countermeasures for DC-DC Converter Input Lines using 3-terminal Filters (Feed-through Filters for Power Lines)
In recent years, switching speed of DC-DC converters has increased as the switching frequency has become higher. As a result, high-frequency noise is generated when inductance and stray capacitance of the wiring of board or inside IC resonate due to a sudden change in input current. The high-frequency noise can conduct to external circuits and cause abnormal operation of the set. This Solution Guide introduces examples of noise countermeasures using a three-terminal filter (feed-through filter for power lines) with low ESL, which is effective for noise countermeasures against noise generated on the input side of DC-DC converters.
Important points regarding mounting 3-terminal feed-through filters
The shunt-through connection is a mounting method in which a component is connected in parallel with the power line, and produces an excellent effect for decoupling of the power line. This article will explain each mounting method and their advantages in detail.
TDK Product Features
TDK's 3-terminal filters obtain a sharp attenuation characteristic by combining a capacitor and inductor on one chip, and are highly effective in suppressing noise in electronic devices. A wide-ranging product lineup is made available by taking advantage of TDK's unique technologies such as our firing technique for different materials, including a multilayer type suitable for miniaturization and a wire wound type suitable for power consumption reduction. They thus support signal circuits, power circuits, and large-current power circuits of various electronic devices including digital TVs and smartphones.