When designers are designing Rigid PCBAs, hint layout is certainly considered one among their key tasks. Designers can without difficulty calculate the present day wearing potential of the Rigid PCBA board via the PCBA hint present day calculator. The cause why Rigid PCBA strains are of precise situation is that it immediately influences the present day potential. The IPC-2221 General Design Guidelines are a very good start line for without difficulty measuring the width of board conductors or “strains” with a programmed formula. Of course, its energy isn't always most effective to this, it is usually greater effective features, such as: the period of the hint, the entire resistance cost of the circuit board, the energy loss as a result of the hint resistance. Note : The Trace Calculator is an effective layout tool, however its consequences aren't genuine and want to be adjusted in step with the real software of the project. In the subsequent content, FS Technology will recognition at the creation of hint calculation formulation and symbols.
The minimal width and thickness of conductors at the completed FS Technology Rigid PCBA board want to be decided consistent with the present day sporting capability required with the aid of using the venture and the most allowable conductor temperature rise. For conductors on outer and internal layers of revealed boards, minimal conductor width and thickness. As proven below:
We can calculate the size of the cross-sectional area according to the formula provided by FS Technology
A = (I / (k * T RISE b )) 1/c
The formula for calculating the maximum current that a trace can carry is as follows:
W = A / (T * 1.378 [mils/oz/ft 2 ])
Explain :
A : Refers to the size of the cross-sectional area, the unit is mils²
T : Refers to the thickness of the FS Technology Rigid PCBA trace, the unit is oz/ft²
W : Refers to the trace width, the unit is mils
IMAX : Refers to the maximum current that the trace runs through, the unit is A
T RISE : Refers to the maximum desired temperature rise, the unit is °C
K, B, C : Refer to constant values. According to IPC-2221A standard, 6.2 (“Requirements for Conductive Materials”), their inner layer values are as follows : K = 0.048 B = 0.44 C = 0.725
The formula for calculating the total trace temperature of the circuit board is as follows:
TTEMP = TRISE + TAMB
Explain :
T TEMP : Refers to the temperature of the trace, the unit is °C
T RISE : Refers to the maximum desired temperature rise, the unit is °C
T AMB : Refers to the ambient temperature, the unit is °C
We outline the allowable temperature upward push of the conductor because the distinction among the important cost of the secure working temperature of the FS Technology Rigid PCBA laminate and the most temperature that the Rigid PCBA can withstand. For convection cooled PCBA assemblies, the thermal surroundings is the most ambient temperature at which the broadcast board may be used. For conduction-cooled PCBA assemblies in a convection surroundings, the temperature upward push is because of the strength dissipated through the conduction-cooled additives, and the temperature upward push via the broadcast board and/or warmth sink to the bloodless plate need to additionally be considered. For conduction cooled FS Technology Rigid PCBA assemblies in a vacuum surroundings, the thermal surroundings is the temperature upward push because of the dissipated strength of the additives and the temperature upward push via the FS Technology PCBA and/or warmth sink to the bloodless plate.
Convert the cross-sectional area from mils² to cm² before doing the calculation:
A’ = A * 2.54 * 2.54 * 10-6
Begin to calculate the resistance, the formula for the resistance calculation is as follows:
R = (ρ * L / A’) * (1 + α * (TTEMP – 25 °C))
Explain :
T : Refers to the thickness of the trace, the unit is mils²
W : Refers to the trace width, the unit is mils
R : Refers to the resistance value, the unit is Ω
ρ : Refers to the resistivity parameter, the resistivity parameter of copper is 1.7E-6 [Ω·cm]
L : Refers to the trace length, the unit is cm
α : Refers to the temperature coefficient of resistivity, copper has a temperature coefficient of resistivity of 3.9E-3 [1/°C]
T TEMP : Refers to the trace temperature, the unit is °C
The formula for calculating the voltage drop is as follows :
VDROP = I * R
Explain :
V DROP : Refers to the voltage drop, the unit is V
The formula for calculating FS Technology Rigid PCBA power consumption is as follows:
PLOSS = R * I2
Explain :
P LOSS : Refers to power loss, the unit is W
Example 1
Inputs W = 12 mil T = 5 mil TRISE = 30 °C TAMB = 25 °C L = 12 inch
Output Cross-section Area = 60.00 mils2 IMAX = 4.17 A
Additional output Trace Temperature = 55 °C Resistance = 0.150 Ω Voltage Drop = 0.626 V Power Dissipation = 2.608 W
Example 2
Inputs W = 10 mil T = 3 oz/ft2 TRISE = 20 °C TAMB = 18 °C L = 25 cm
Output Cross-section Area = 41.34 mils2 IMAX = 2.66 A
Additional output Trace Temperature = 38 °C Resistance = 0.167 Ω Voltage Drop = 0.444 V Power Dissipation = 1.182 W
With the development of the electronics manufacturing industry, human beings improve the functions of electronic products through PCB boards. As the best one-stop PCB company in China, FS Tech believes that it is our responsibility to show the world our manufacturing capabilities, assembly capabilities and testing capabilities to do our part for the PCB industry. In order to facilitate the novice in the PCB industry, we will distinguish the blog website according to different types: printed circuit board materials 、PCB motors 、printed circuit board printing 、pcb soldering
With the development of the electronics manufacturing industry, human beings improve the functions of electronic products through PCB boards. With the development of PCB assembly technologies such as DIP and SMT, we can see that electronic products are getting smaller and smaller, but their functions are becoming more and more powerful. As the best one-stop PCB company in China, FS Tech believes that it is our responsibility to show the world our manufacturing capabilities, assembly capabilities and testing capabilities to do our part for the PCB industry.
In order to facilitate the novice in the PCB industry, we will distinguish the blog website according to different types.
There are blogs about the introduction of printed circuit board materials that are mainly aimed at newcomers to PCBs. This blog mainly starts with raw materials to help you understand how PCBs are manufactured, what materials are used, why these materials are used, what advantages does it have, etc. I believe that through reading these articles, you will have knowledge in this area have a comprehensive understanding
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Learning at this stage is inevitable and necessary. A comprehensive understanding of printed circuit board printing technology allows engineers to master all PCB manufacturing techniques. Engineers who have read the content of this blog site have basically mastered all the manufacturing techniques and have a clear understanding of the manufacturing process.
Soldering refers to soldering electronic components to the bare PCB board when assembling circuit boards. Many people may have questions: why solder electronic components? Can I just use the PCB board directly? If you do have such a problem, then the content of the pcb soldering website is something you can't miss, it will explain all the assembly process, assembly process, soldering process and so on for you.