Switching power supply 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 perfectly designed power supply on paper may not function properly during initial commissioning because of the many problems with the PCB layout of the power supply. Now the rapid replacement of electronic products, is simply lightning, product design engineers are more inclined to choose easily purchased in the market to the AC / DC adapter, and multiple sets of DC power supply installed directly in the system line On the board. As the electromagnetic interference generated by the switching power supply will affect the normal operation of its electronic products, the correct power PCB layout has become very important. According to experience summed up the eight basic points of switching power supply PCB layout. Here's a brief summary of what the eight points are for each. Point 1, the bypass capacitor ceramic capacitors can not be too large, and its parasitic series inductance should be as small as possible, multiple capacitors in parallel to improve the capacitance impedance characteristics; Point 2, the parasitic inductance of the parallel capacitor should be as small as possible, the distance between the inductor pin pad as far as possible; Point 3, to avoid placing any power or signal traces on the formation; Point 4, high-frequency loop area should be reduced as much as possible; Point 5, through-hole placement should not undermine the high-frequency current path in the formation; Point 6, the system board with a small circuit needs a different ground layer, small circuit with the ground through a single point of connection with the power ground plane; Point 7, the control chip to the upper and lower FET drive circuit loop to be as short as possible; Point 8, switching power supply power circuit and control signal circuit components need to connect to the same small ground plane, the two strata are usually connected by a single point. Aluminium Metro Screen Door,Aluminum Rail Track,Aluminium Door Parts,Aluminium Door Canopy KAM KIU ALUMINIUM GROUP , https://www.taishankamkiu.com