Aluminum Based PCB with High Temperature FR4/FR5
Basic Info
Model No.: aluminum pcb chip
Product Description
What is difference between chip and PCB? What is the difference between PCB board and origin electronics IC?
2, single power supply to double power supply circuit
In the circuit of the figure, the time base circuit 555 is connected as an astable circuit, and the output frequency of pin 3 is 20KHz, and the duty ratio is 1:1 square wave. When pin 3 is high, C4 is charged; when low, C3 is charged. Due to the existence of VD1 and VD2, C3 and C4 are only charged but not discharged in the circuit, and the maximum charging value is EC. Connect B Terminal to ground, and a +/-EC dual power supply is obtained at both ends of A and C. The output current of this circuit exceeds 50mA.
Integrated circuit generally refers to the integration of chips, like the Northbridge chip on the motherboard, the inside of the CPU is called integrated circuit, and the original name is also called integrated block. And the printed circuit refers to the circuit board we usually see, as well as printing solder chips on the circuit board.
Integrated circuit (IC) is soldered on the PCB board; the PCB board is the carrier of the integrated circuit (IC). The PCB board is a printed circuit board (PCB). Printed circuit boards appear in almost every electronic device. If there are electronic parts in a certain device, the printed circuit boards are all mounted on PCBs of different sizes. In addition to fixing various small parts, the main function of the printed circuit board is to electrically connect the various electronic components above.
Simply put, an integrated circuit integrates a general-purpose circuit on a chip. It is a whole. Once it is damaged inside, the chip is also damaged, and the PCB can be soldered by itself, and if it is broken, it can be replaced.
Circuit and pattern (Pattern): The circuit is used as a tool for conduction between the originals. In the design, a large copper surface will be additionally designed as a grounding and power layer. The route and the drawing are made at the same time.
Dielectric layer (Dielectric): Used to maintain the insulation between the circuit and each layer, commonly known as the substrate.
Hole (Through hole / via): The through hole can make the lines of more than two levels connect to each other. The larger through hole is used as a part plug-in. In addition, there are non-through holes (nPTH) that are usually used as surface mounts. It is used for fixing screws when installing and positioning PCB assembly.
Solder resistant /Solder Mask: Not all copper surfaces need to be tin-on parts, so the non-tin area will be printed with a layer of material that insulates the copper surface from tin-eating (usually epoxy resin), avoid Short circuits between non-tinned circuits. According to different processes, it is divided into green oil, red oil and blue oil.
Silk screen (Legend /Marking/Silk screen): This is a non-essential structure. The main function is to mark the name and position frame of each part on the circuit board, which is convenient for maintenance and identification after assembly.
Surface Finish: Because the copper surface is easily oxidized in the general environment, it can not be tinned (poor solderability), so it will be protected on the copper surface that needs to be tinned. The protection methods include HASL, ENIG, Immersion Silver, Immersion Tin, and Organic Solder Preservative (OSP). Each method has its advantages and disadvantages, which are collectively referred to as surface treatment.
PCB board characteristics
can be high density (HDI PCB). For decades, the high density of printed boards has been able to develop along with the improvement of integrated circuit integration and the advancement of mounting technology.
High reliability. Through a series of inspections, tests and aging tests, the PCB can work reliably for a long time (usually 20 years).
can be designed. For PCB performance (electrical, physical, chemical, mechanical, etc.) requirements, printed board design can be achieved through design standardization, standardization, etc., with short time and high efficiency.
Producibility. With modern management, standardized, scaled (quantitative), automated and other production can be carried out to ensure product quality consistency.
Testability. A relatively complete test method, test standard, various test equipment and instruments have been established to detect and appraise the eligibility and service life of PCB products.
can be Mixed Assembly. PCB products are not only convenient for standardized assembly of various components, but also for automated and large-scale mass production. At the same time, PCB and various component assembly parts can be assembled to form larger parts and systems, up to the complete machine.
maintainability. Since PCB products and various component assembly parts are designed and produced on a large scale, these parts are also standardized. Therefore, once the system fails, it can be replaced quickly, conveniently and flexibly, and the system can be quickly restored to work. Of course, there can be more examples. Such as miniaturization and weight reduction of the system, and high-speed signal transmission.
Integrated circuits have the advantages of small size, light weight, fewer lead wires and soldering points, long life, high reliability, and good performance. At the same time, they have low cost and are convenient for mass production. It is not only widely used in industrial and civilian electronic equipment such as radio cassette recorders, televisions, computers, etc., but also in military, communications, and remote control. The use of integrated circuits to assemble electronic equipment can increase the assembly density by tens to thousands of times compared with transistors, and the stable working time of the equipment can also be greatly improved.
Integrated Circuit Application Examples
1, 555 touch timer Switch
Integrated circuit IC1 is a 555 timing circuit, which is connected as a monostable circuit here. Normally, because there is no induced voltage at the P terminal of the touch pad, the capacitor C1 is discharged through the 7th pin of the 555, the output of the 3rd pin is low, the Relay KS is released, and the light does not turn on.
When you need to turn on the light, touch the metal piece P with your hand, and the clutter signal voltage induced by the human body is added from C2 to the trigger terminal of 555, so that the output of 555 changes from low to high. The relay KS pulls in and the light turns on. Bright. At the same time, the 7th pin of 555 is internally cut off, and the power supply charges C1 through R1, which is the beginning of timing.
When the voltage on the capacitor C1 rises to 2/3 of the power supply voltage, the 7th pin of 555 is turned on to discharge C1, so that the output of the 3rd pin changes from high level to low level, the relay is released, the light goes out, and the timing ends.
The timing length is determined by R1 and C1: T1=1.1R1*C1. According to the value marked in the figure, the timing time is about 4 minutes. D1 can choose 1N4148 or 1N4001.
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