PCB Design

Printed circuit board design is based on the schematics, circuit designers to achieve the required functionality. Printed circuit board layout design mainly refers to the need to consider the layout of the external connections. Optimize the layout of the internal electronic components. Optimize the layout of metal wires and vias. Electromagnetic protection. Heat dissipation, and other factors. Excellent layout can reduce production costs, to achieve good performance of the circuit and thermal performance. Simple layout can be achieved by hand; complex layout needs the computer-aided design (CAD) implementation.

The circuit arrangement in accordance with the position of each process function of the circuit unit, the signal flow so easy layout, and to maintain the same direction as the signal. The core components of each functional unit centered on him for layout. Components should be uniform, overall, compact arrangement on the PCB, minimize and shorten the leads and connections between the various components. The circuit at high frequency operation, to consider the distribution parameters between components. General circuit should be possible to make components arranged in parallel, so not only beautiful, but also easy to install dry, easy to mass production.

In the design, Aluminum pcb from the assembly point of view, to consider the following parameters:
1) The maximum diameter of the hole according to the material conditions (MMC) and with minimal material conditions (LMC) to decide. A non-porous support such components should be selected diameter, subtracting from the MMC pin holes, resulting in a difference 0.15 -0.5mm between. And the pin strip, the diagonal and non-nominal inner diameter difference between the pin supporting holes will not exceed 0.5mm, and less than 0.15mm.
2) A reasonable place smaller components, so that it will not be covered larger components.
3) The thickness of the solder should not exceed 0.05mm.
4) Screen printing logo cannot intersect any pads Upper half.
5) And the lower half of the board should be the same, in order to achieve structural symmetry. Because asymmetric circuit board may become bent.