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Pcb designing

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Pcb designing

  1. 1. PCB DESIGNING By BHANU PRATAP SHARMA 11470102810 E.C.E-B
  2. 2. Introduction to a Printed Circuit Board • A printed circuit board (PCB) mechanically supports and electrically connects electronic components using conductive tracks, pads and other features etched from copper sheets laminated onto a nonconductive substrate. • PCB's can be single sided (one copper layer), double sided (two copper layers) or multi-layer. • A PCB populated with electronic components is called a printed circuit assembly (PCA), printed circuit board assembly or PCB assembly (PCBA)
  3. 3. What PCB is made of • A basic PCB starts with a copper-clad fiberglass material or thin copper sheets attached to either side of the board. It consist of : Copper Foil  Copper Plating  Solder Flow  Solder Mask  Trace  Slots and Cut-outs
  4. 4. FABRICATION Following are the basic steps of PCB design. • Set-Up • Imaging • Etching • Drilling • Masking • Silk Screening • Route • Electrical Test
  5. 5. PCB characteristics • Through-hole technology The first PCBs used through-hole technology, mounting electronic components by leads inserted through holes on one side of the board and soldered onto copper traces on the other side. Boards may be single-sided, with an un plated component side, or more compact double-sided boards, with components soldered on both sides • Surface-mount technology Surface-mount technology emerged in the 1960s, gained momentum in the early 1980s and became widely used by the mid-1990s. Components were mechanically redesigned to have small metal tabs or end caps that could be soldered directly onto the PCB surface, instead of wire leads to pass through holes
  6. 6. Etching process Chemical etch • Chemical etching is usually done with ammonium per sulphate or ferric chloride. • For PTH (plated-through holes), additional steps of electroless deposition are done after the holes are drilled, then copper is electroplated to build up the thickness, the boards are screened, and plated with tin/lead. The tin/lead becomes the resist leaving the bare copper to be etched away. Cont.…
  7. 7. Laser/Plasma Etch • A new process creating new standards and the demise of the chemical process is plasma etch. In addition to no etch-back, this process also eliminates imaging, or film error using a direct imaging process, which transfers the layer image directly to the material.
  8. 8. Design Assembly • Manual Assembly • Auto Assembly Hole preparation is normally done in the manufacturing process that plates/or coats the exposed copper areas with solder. This prepares the surface of pads, as well as the hole itself, with a fine coat of solder that will make soldering easier by helping the solder adhere to the pad and hole wall and helping the solder to "wick" through the hole. Auto assembly is an automated process where most of the component on a board are placed and soldered to the board by machine. Auto assembly requires additional information from the designer, in addition to the standard Assembly information provided for manual assembly.
  9. 9. Assembly Limitation • The number of parts that can be assembled in one pass • Double-sided assembly • Overall panel/board size • Component size • Component types (surface mount or thru-hole)
  10. 10. Routing • Manual Route • Auto Route Route the following types of nets first: • Most difficult • Most complex • Tight fitting nets first • Very high current (primarily external) • Very high voltage (primarily internal) • Manually route those items shown in "manual routing " first, if necessary. • Manually clean up paths. • Miter right angle corners. • Run DRC /design rules to ensure clearances are met. • Check annular ring.
  11. 11. EAGLE • Stands for Easily Applicable Graphic Layout Editor • flexible, expandable and scriptable EDA application with schematic capture editor, PCB layout editor, auto-router • Latest version is 6.1 and minimum requirements are MAC OS X 10.6, Linux 2.6 and Windows XP.
  12. 12. Schematic on EAGLE
  13. 13. Board designing and routing
  14. 14. Power supply board • A power supply is a device that supplies electric power to an electrical load. • Power converters that convert one form of electrical energy to another. • Power supplies for electronic devices can be broadly divided into line-frequency (or "conventional") and switching power supplies.
  15. 15. POWER SUPPLY PCB
  16. 16. THANK YOU

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