Switching power supply PCB fast wiring eight points

Switching power supply generated by electromagnetic interference, often affect the normal work of electronic products, the correct switching power supply PCB layout has become very important. A power supply that is perfectly designed on paper may not function properly during initial commissioning because of many problems with the PCB layout of the power supply. So what a good way to solve it? This article summarizes the switching power supply PCB fast wiring eight points.

Switching power supply generated by electromagnetic interference, often affect the normal work of electronic products, the correct switching power supply PCB layout has become very important. In many cases, a power supply that is perfectly designed on paper may not function properly during initial commissioning because of many problems with the PCB layout of the power supply.

Now electronic products replacement fast, is simply lightning speed, product design engineers are more inclined to choose in the market is very easy to purchase AC / DC adapter, and the number of DC power supply installed directly in the system line On the board. As the switching power supply to produce electromagnetic interference will affect the normal work of its electronic products, the right power PCB layout becomes very important. Based on experience, summed up the basic points of eight-point switching power supply PCB layout.

1.Bypass ceramic capacitor capacitor can not be too large, and its parasitic series inductance should be as small as possible, a number of parallel capacitor can improve the impedance characteristics of the capacitor;

2.The parasitic shunt capacitance of the inductor should be as small as possible and the farther the better the distance between the inductor pin pads is

3.Avoid placing any power or signal traces on the formation;

4.High-frequency loop area should be reduced as much as possible;

5.The placement of vias should not disrupt the path of high frequency currents on the formation

6.A small circuit on the system board requires a different ground plane, a small circuit with the ground plane through a single point with the power ground layer connected;

7.Control circuit to the top and bottom FET drive circuit loop to be as short as possible

8.Switching power supply circuit and control signal circuit components need to be connected to a small ground plane, the two strata are generally connected through a single point.