Power Supply Tip 31: The Right Choice of Synchronous Buck MOSFET Resistor Ratio
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In this Power Design Tip, we'll look at how to trade conduction power in a synchronous buck power stage, which is related to duty cycle and FET resistance ratio. Performing this compromise process yields a very useful starting point for FET selection. Typically, as part of the design process, you have a set of specifications that include the input voltage range and the desired output voltage, and you need to select some FETs. In addition, if you are an IC designer, you will also have a budget that specifies the FET cost or package size. These two inputs will help you choose the total MOSFET chip area. These inputs can then be used to optimize the efficiency of each FET area.
Steel pipes have a hollow section and are used in large quantities as pipelines for conveying fluids, such as pipelines for conveying oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, steel pipe is lighter when the bending and torsion strength is the same. It is a kind of economical cross-section steel, which is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, and bicycles. And steel scaffolding used in building construction.
The use of steel pipes to manufacture ring-shaped parts can increase the utilization rate of materials, simplify the manufacturing process, and save materials and processing man-hours, such as rolling bearing rings, jack sleeves, etc., which have been widely used for manufacturing at present. Steel pipes are also an indispensable material for various conventional weapons. Gun barrels and barrels are all made of steel pipes. Steel pipes can be divided into round pipes and special-shaped pipes according to different cross-sectional area shapes. Since the circle area is the largest under the condition of the same circumference, more fluid can be transported with a circular tube. In addition, when the ring section bears internal or external radial pressure, the force is relatively uniform. Therefore, most steel pipes are round pipes. However, round pipes also have certain limitations. For example, under the condition of plane bending, round pipes are not as strong as square and rectangular pipes. Some agricultural machinery frameworks, steel and wood furniture, etc. often use square and rectangular pipes. According to different purposes, special-shaped steel pipes with other cross-sectional shapes are required, such as square, rectangular, semi-circular, hexagonal, equilateral triangle, octagonal and complex cross-section steel pipes-unequal hexagonal steel pipes, five-petal plum-shaped steel pipes, Double convex steel pipe, double concave steel pipe, melon seed steel pipe, conical steel pipe, corrugated steel pipe, case steel pipe and other special-shaped steel pipes.
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