The TI chip has arrived, but the problem is how can I use it on my own with this kind of packaging?

windhua

The TI chip has arrived, but the problem is how can I use it on my own with this kind of packaging? [Copy link]

Many people should have received this. The key is how to tinker with this kind of SMD package? Is anyone already doing it? Especially the TPS55010, when I opened it and saw the QFN, I was immediately stunned～～:funk:

I really want to ask how to fix it? Should I buy a SMD multi-purpose board? Does that also have a package? ?

蓝雨夜

Thermal transfer

windhua

:Sad: No heat transfer～～～～～We are not in school. . .

anqi90

Photosensitive plate + developer + ferric chloride, printed on A4 paper, exposed to the sun for 6 minutes on a sunny day, and it was done in one afternoon.

windhua

:Sweat: Just buy a SMD board and set it up. As for the QFN one... frame it and hang it on the wall~~

chunyang

If there is a PCB, hand soldering is OK. Note that the pads cannot use the ready-made library in the PCB software. They need to be modified and extended for manual soldering. If there is a pad on the bottom, a large enough through-hole pad needs to be opened on the PCB, and the bottom pad can be soldered by manual tinning. If it is a very simple circuit and a multi-purpose board is used instead of a PCB, the chip can be turned over, and the pads can be soldered with fine enameled wires and then led out to the external circuit. This requires higher craftsmanship.

chunyang

The regular welding of QFN devices is to use a steel mesh to leak solder paste, and then reflow soldering after patching. My general approach is to make some spare packages on the edge of the steel mesh, including a variety of QFNs, and then weld them according to the regular process. This method will be faster, the quality is also guaranteed, and it can fully meet product-level requirements.

larrybirdkobe

I have used QFN, it is best to use reflow soldering, if you have good soldering skills you can also solder it yourself

liyu7788962

How to play BGA? 》

daijun

There are many BGA soldering methods on the Internet. Tinning is required.

damiaa

There is a big difference between QFN and BGA. After all, it can still be soldered by hand.

alenc007

My sample is TPS54620, in QFN package. I bought a thinner soldering iron tip and replaced it to fix it!

damiaa

Where can I get the small transformer that comes with TPS55010?

常见泽1

It is indeed troublesome. BGA cannot be applied for.

robin-feng@ti

QFN hand soldering can also be done

Triton.zhang

QFN package is now very common. Don't be afraid of difficulties. Here I will share my experience with you: 1. When applying for Ti's sample, you should pay attention to the package type. Many of TI's chips have QFN and SSOP packages. If you are sure that you can't make PCB boards, it is best to apply for SSOP packages. 2. Don't make PCB boards yourself. Although many people have experience in making PCB boards themselves, the chip packages are getting smaller and smaller now. There is no solder mask and no soldering. Unless you have very good skills, it is difficult to ensure the welding quality. The current PCB processing cost is not high. There are several proofing companies in Shenzhen. 5X5 only costs 50, 10X10 only costs 100, which will save you a lot of time. And through this process, you are also familiar with how a normal company works. When drawing PCB boards, read more materials and learn more about system knowledge. If you don't want to spend this money, then I suggest you change your career immediately. 3. When soldering QFN packages, you should first solder the chip ground, and then solder the pads on the board. It is best to use a knife-type soldering iron. Run a thin pass on the pad, put the chip on it, clamp it with tweezers to align the position, and then blow it on the back with a hot air gun. Don't try to fix it in this way. As long as the chip position is aligned and slightly fixed, it will be fine. Then use a drop of flux on the surface of the 4 pins, use solder and Luo iron to run solder on all four sides, and use the surface tension of the melted solder to solder the pins. Although there are a lot of steps written out, it is not that difficult. As long as you try a few more times and constantly summarize your experience, you will be able to solder it well. 4. Don't think that you don't need to learn welding because you are a software engineer. Learning welding technology is very necessary and very useful for embedded engineers.

秋之初

PCB proofing is very cheap now. Of course, you can also directly connect it to the solder balls with thin wires and support it on a universal board:)