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Have you noticed that now more and more of our lighting is using led lighting.What is LED? Compared to the traditional light bulbs, LEDs have lower power consumption, longer lifetime and higher energy efficiency. In the PCB industry,when we say LED PCB, it refers to the pcb used for LED lighting, if you are looking for a suitable LED PCB for your lighting system, this article may bring you something. WHAT ARE LEDS COMPOSED OF?LED is an initial light-emitting diode that produces light when an electric current passes through. LEDs typically have negative and positive electrodes, which generate light in the visible light region.The LEDS are glued to the PCB by soldering process and have electrical connections for lighting.Since light-emitting diodes dissipate a lot of heat when they are in use, when you are designing LED, the metal core is usually the best choice for LED PCB, it is because that it dissipates heat more faster. Among them, the metal material aluminum is the most widely used
Copper coating, that is, the idle space on the PCB is used as the base level, and then filled with solid copper, these copper areas are also called copper filling. The significance of copper coating is to reduce the ground impedance and improve the anti-interference ability. Reduce voltage drop, improve power efficiency; Also, connect to the ground wire to reduce the area of the loop. If there are many PCB places, such as SGND, AGND, GND, etc., how to cover copper? My approach is that according to the different positions of the PCB board, the most important "ground" is used as a benchmark reference to independently cover copper, and digital and analog copper are separated from each other. At the same time, before coating copper, first bold the corresponding power cable: V5.0V, V3.6V, V3.3V(SD card power supply), and so on. In this way, multiple deformation structures of different shapes are formed. The copper coating needs to deal with several problems: one is the single point con
1, 3 points above the line, try to make the line through each point, easy to test, the line length as short as possible. 2, try not to put wires between pins, especially between and around integrated circuit pins. 3, the lines between different layers should not be parallel as far as possible, so as not to form an actual capacitor. 4, the wiring is as straight as possible, or 45 degree line, to avoid electromagnetic radiation. 5, ground wire, power cord at least 10-15mil above (for logic circuit). 6. Try to connect the ground polysemy lines together and increase the ground area. Line to line as neatly as possible. 7, pay attention to the uniform emission of components, so as to install, plug-in, welding operation. The text is discharged in the current character layer, the position is reasonable, pay attention to the orientation, avoid being blocked, easy to produce.
1, choose a reasonable wire width Since the impact interference caused by the transient current on the printed line is mainly caused by the inductive component of the printed wire, the inductance of the printed wire should be minimized. The inductance of the printed wire is proportional to its length and inversely proportional to its width, so a short and fine wire is advantageous for suppressing interference. Signal lines for clock leads, line drivers, or bus drivers often carry large transient currents, and printed wires should be as short as possible. For discrete component circuits, when the width of the printed wire is about 1.5mm, the requirements can be fully met; For integrated circuits, the printed wire width can be selected between 0.2 and 1.0mm. 2, use the correct wiring strategy The use of equal wiring can reduce the inductance of the wire, but the mutual inductance and distributed capacitance between the wires increase, if the layout allows, it is best to use a well
As the carrier of various components and the hub of circuit signal transmission, PCB has become the most important and critical part of electronic information products, and its quality and reliability level determine the quality and reliability of the whole equipment. With the miniaturization of electronic information products and the environmental requirements of lead-free and halogen-free, PCB has also developed in the direction of high density, high Tg and environmental protection. However, due to cost and technical reasons, PCB has a large number of failure problems in the production and application process, and therefore caused a lot of quality disputes. In order to find out the cause of the failure in order to find a solution to the problem and distinguish the responsibility, it is necessary to carry out failure analysis on the failure cases. To obtain the exact cause or mechanism of PCB failure or failure, it is necessary to follow the basic principles and analysis process,
The general trend of industrial eastward movement, the mainland region outshines. The focus of the PCB industry continues to shift to the Asian region, and the capacity of the Asian region has further transferred to the mainland, forming a new industrial pattern. Applications such as data centers increase the demand for HDI, and the future space for FPC is broad. Data centers are developing towards the characteristics of high speed, large capacity, cloud computing, and high performance, and the construction demand is surging, among which the demand for servers will also pull up the overall demand for HDI. The popularity of mobile electronic products such as smartphones will also drive the demand for FPC boards. In the trend of intelligent and thin mobile electronic products, the advantages of light weight, thin thickness and bending resistance of FPC will be conducive to its wide application. The demand for FPC in the display module, touch module, fingerprint recognition module, sid
1) Single panel: This type of panel is usually used in the case of lower cost requirements. In layout design, sometimes components are needed or jumper wires are used to skip the circuit board's wiring. If there are too many, you should consider using dual panels. 2) Dual panel: Dual panel can be used or not to use PTH. Because PTH boards are expensive, they are only used when the complexity and density of the circuit require them. In general, the choice between a single panel or a dual panel must meet the most efficient cost utilization. As a rule of thumb, the cost of a double-sided printed board with plated through holes is 5-10 times that of a single panel. Similarly, the cost of assembling components is also an important aspect to consider, the cost of assembling a single-sided printed circuit board component (manual) is about 25%-50% of the cost of the circuit board, and the cost of assembling a double-sided printed circuit board component with PTH is 15%-30% of its cost.
Automatic optical inspection (AOI) systems are commonly used to test the inner layer before the formation of layers. After stratification, X-ray systems monitor alignment accuracy and minor defects; A scanning laser system provides a way to detect the layer before reflow. These systems, along with line visual inspection technology and component integrity testing for automatically placed components, help ensure the reliability of the final assembly and welded plates. However, even if these efforts minimize defects, the final inspection of the assembled printed circuit board is still required, which is perhaps the most important, as it is the final unit for product and overall process evaluation. The final inspection of the assembled PCB board may be done by an active method or by an automated system, and often both methods are used together. Manual "means that an operator uses optical instruments to visually inspect the board and make a correct judgment about the gap. Automated sy
Automatic optical inspection (AOI) systems are commonly used to test the inner layer before the formation of layers. After stratification, X-ray systems monitor alignment accuracy and minor defects; A scanning laser system provides a way to detect the layer before reflow. These systems, along with line visual inspection technology and component integrity testing for automatically placed components, help ensure the reliability of the final assembly and welded plates. However, even if these efforts minimize defects, the final inspection of the assembled printed circuit board is still required, which is perhaps the most important, as it is the final unit for product and overall process evaluation. The final inspection of the assembled PCB board may be done by an active method or by an automated system, and often both methods are used together. Manual "means that an operator uses optical instruments to visually inspect the board and make a correct judgment about the gap. Automated sy
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