Regarding the improvement suggestions after studying "PCB layout and thermal design system of high-density power system", please use the website as "Editor"...
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Regarding the improvement suggestions after studying "PCB Layout and Thermal Design System of High-Density Power System" , please add to the website in the form of "Editor's Note". We really hope for improvement.
After watching it, I feel that the Mandarin is not standard and it is very difficult to listen to, but I can still understand it. There are praises, and if there are shortcomings, please point them out on the website as "Editor's Note". I really hope to improve.
The good aspects of teaching,
1) I like the big data comparison method combined with data graphs.
2) The examples are appealing to both the elite and the masses, and are also convenient for low-end applications. They are very suitable for people who have a little basic knowledge of electronics.
The points that cannot be ignored from the perspective of multi-layer boards can also be applied to two-layer boards.
Taking the CPU as an example, 0.8v 500a, under high current conditions, it is also very instructive.
The driving of G under Mos driving conditions, the influence of different characteristics of capacitors and inductors under PCB layering conditions, the key directions to be considered, the detailed analysis is very good and it is easy to learn.
3) Some key tips, good
a) Although it is also partially mentioned in the textbook, it is not necessarily considered when using it.
For example, the turning curve of the capacitor under the charge and discharge frequency;
b) Part is easily overlooked in the application process,
when the power switching frequency exceeds the bandwidth;
when the circuit loop is large, the inductance is high;
multiple small capacitors are better at high frequencies.
The shortcomings of teaching
4) There are some shortcomings, but they are tolerable. It would be best if they were modified.
a) Temperature, temperature rise and copper skin issues.
It is recommended to add details on how many amperes are allowed for a 10mil wide and 1oz thick copper skin in a conservative way under a temperature rise of 30 degrees.
bc) 3M filter waveform part before and after the problem, add 1 condition.
Add details Under the condition of 1.6mm thick PCB, 10mil width and 1 OZ thick copper sheet,
The corresponding capacitance, the corresponding inductance and its filtering bandwidth, its data chart and oscilloscope graph.
cc) Regarding the issues before and after the 3M filter waveform part, one was added and one was modified, for a total of 2 conditions.
Add details: Under the condition of 1.6mm thick PCB, 10mil width and 1 OZ thick copper foil,
and change the details: the power IC output switching frequency is 150k Hz to drive the G level of MOS (that is, 1.5M Hz changed to 150k Hz),
the corresponding capacitance, the corresponding inductance and its filtering bandwidth, and its data chart and oscilloscope graph.
d) The data in the schematic diagram are all in English.
I hope to add the data in International System of Units after the English data to avoid the inertia of the learners' learning habits to the International System of Units, and subconsciously convert them, which will reduce the learning efficiency after being distracted.
I also know that PCBs are mostly manufactured in English.
5) If there is any confusion, it is best to add
a) Mil part: The teacher said that the big square is the same as the small square. Could you please explain whether they are made of
the same conductive material, on the copper sheet of the same thickness, with the same current and the same heat dissipation coefficient on the circuit of the outer surface layer? The vector sum calculation of the heat generated by itself and the heat transferred from the lower layer still shows the same thermal resistance.
6) I would like to add some information
about a) temperature, temperature rise and copper.
I strongly suggest adding details. Application scenarios, when using capacitors to reduce voltage fluctuations, how many amperes are allowed in a conservative way. The teacher did not mention this. Further analysis is needed.
If the temperature rises by 30 degrees, the copper sheet is 10mil wide and 1 oz thick, and the subsequent circuit components are capacitors, then the data graph of the voltage difference and current in the conservative way is:
7) I am very disgusted with
Watching the tutorial video, the orange background with white text in the center of the video is annoying. How to cancel it?
(It seems more like logging into this website, clicking the central button with white text on an orange background, and then not wanting to continue to pass on the phone number, the prompt box does not disappear.)
PS Some personal information can be made public, and I am willing to partially disclose it. Emails are usually tolerated, that is, advertising emails can be tolerated.
But the information of the mobile phone is critical, involving bank cards, you know, so I am unwilling to pass on the mobile phone number to companies other than the website;
I don’t want his small gift, okay?
If the mobile phone number is a required option, then I participate in the viewing purely to learn. This is the best solution.
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When promoting this video later, I would like to borrow the words from your comment.
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