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What are the benefits of variable switching frequency?

April 26, 2017Benefits Frequency switching

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What are the benefits of variable switching frequency?

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Some switching regulator applications, such as an AM radio in a car, are sensitive to particular frequency bands. Choosing the best switching frequency is crucial in these applications for avoiding Electro-Magnetic-Interference (EMI). The inductor value in a switching regulator is often inversely proportional to the switching frequency, but the losses are directly proportional. Therefore, having a choice of switching frequency allows optimization of size versus efficiency.