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Learn how to analyze the problems and solutions in the design of the DC-DC converter

wallpapers News 2021-04-29
Learn how to analyze the problems and solutions in the design of the DC/DC converter, from common buck circuit, in design and debugging process, the usual from DCDC converter performance, function setting, control loop design, board layout and test technique, by analyzing the instance can understand DC-DC circuits rapidly get rid of some common problems in the commissioning phase.
In the power supply system of common electronic products, the Buck conversion circuit in the DC-DC switch circuit is analyzed. Buck is one of the most basic DC-DC circuits. Some of the main principles of the design of the BUCK circuit are already familiar to many people.
Electronic products usually take power from an alternating current, into a high voltage of 400V, and then through a high voltage buck DC/DC, into the DC bus in the middle of DC12V, the terminal load may be an FPGA, may also be a microprocessor MCU, may also be a Flash memory. The power supply system as shown in the figure is to supply power to an electronic product. The power supply frequency required for the final load may be different. At this time, 12V will be installed in the middle bus, and a BUCK circuit will be generally added between the loads at the terminal to convert 12V into the voltage required by the load.
The most common DC/DC buck converter in the power supply is the simplest and most efficient DCDC converter. It is widely used, of course, its working principle is also very simple.
For buck converters
Its main power loop has two, one is the input-output loop, the other is the inductor's continuous current loop, the area of these two loops, will directly affect some of our parasitic parameters, and reduce its loop area, can effectively reduce our parasitic inductors inside the loop, but also reduce the electromagnetic interference.
It should also be noted that some analog lines that are more sensitive to noise, such as FB and COMP pins, the principle of the power loop with large noise, such as SE or BOOT pins. Adding a slow circuit or gate resistor to slow down one of its switching speeds can also reduce some of the oscillations on its switching, but this is achieved at the cost of increasing switching losses and is not the optimal solution.

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