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Welcome to the power design tips! This column is for design engineers at all levels. Whether you're in the power business for many years or just stepping into the power supply, you can find some extremely useful information here to help you meet your next design challenge. Choosing the best operating frequency for your power supply is a complex trade-off process that includes size, efficiency, and cost. In general, low frequency designs tend to be the most efficient, but they are the largest and most costly. Although increasing the frequency can reduce the size and reduce the cost, it will increase the circuit loss. Next, we use a simple step-down power supply to describe these trade-offs.
We start with a filter component. These components occupy most of the power supply volume, while the size of the filter is inversely proportional to the operating frequency. On the other hand, each switching conversion is accompanied by energy loss; the higher the operating frequency, the higher the switching loss and the lower the efficiency. Second, higher frequency operation usually means that smaller component values ​​can be used. Therefore, higher frequency operation can bring significant cost savings.
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