Voltage appears in node A (Figure 1), noise will be much lower in node B. The buck regulator will be attenuated by the additional filter. Load may be a high resolution ADC, DAC, a low signal op amp, or a Of the switch-mode power supply and the sensitive load. Intuitively, one would put this filter between the output The location of the additional filter in the circuit is very important for Buck regulator to power noise sensitive loads with an LC filter on the output. & amp lt img src=' ' alt='Figure 1'& amp gt įigure 1. Usually between 500 kHz and 3 MHz, and from the switching transitionįrequency, usually between 50 MHz and 200 MHz, is attenuated. High frequency noise coming from the switching frequency, The output voltage of the power supply is being filtered by When there is a noise issue in sensitive electronic equipment powered byĪ switch-mode power supply, a filter consisting of L2 and C3 can often be Depending on the values for L and for C, the corner frequency-in this case, the double pole-can be set in a way to reduce the noiseįrom the switching frequency and the switching transition frequency This type of LC filter creates a double pole in the frequencyĭomain. In series with the power flow and a capacitor from the filtered voltage One that works especially well is an LC filter with an inductor Switching Regulator Noise Reduction with an LC Filterĭifferent filtering techniques can be used to reduce the noise of a switching
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