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This graph shows the affect of a faster switching frequency. A faster frequency decreases the efficiency since the switching and FET driving losses are greater. On the other hand, since the pulses are closer together, less energy needs to be stored, so a smaller L & C filter can be chosen to save board space. At 1.6MHz, a smaller design is shown with a smaller output capacitor and inductor (both size and value). As the frequency is lowered, it takes more inductance and capacitance to store energy. These 3 designs are each optimized for size based on the switching frequency chosen. The devices shown at the bottom are SWIFT devices that can switch at or greater than 1MHz.
PTM Published on: 2011-11-10
