How can i find and learn about some ICs whose datasheets are not available on google.

for example S9517 IC ( i have seen it in an LED driver circuit).

is there any way to find out information of such ICs.

that IC is not available in any of the online store or IC search engines i know. that kind of many ICs i have seen in many products whose datasheet was not available online. How can i find that?

 

Chances are if you can not find a datasheet it is a proprietary IC and not for general use. Other than that it may also be something that has not been translated due to lack of interest by the general public. Most likely it is a proprietary IC though.

 

Chances are if you can not find a datasheet it is a proprietary IC and not for general use. Other than that it may also be something that has not been translated due to lack of interest by the general public. Most likely it is a proprietary IC though.

does mean the company using that IC had designed it and produced it in mass by some proprietor. If they haven't designed it then the question is that how did they came to know about that IC?

there must be some source they are using for selecting this kind of IC, otherwise without datasheet they couldn't select perfect IC for their product.

 

does mean the company using that IC had designed it and produced it in mass by some proprietor. If they haven't designed it then the question is that how did they came to know about that IC?

there must be some source they are using for selecting this kind of IC, otherwise without datasheet they couldn't select perfect IC for their product.

The key words there are "perfect IC for their product". They may have designed the IC in house and contracted with another company to manufacture it, or had manufacturing companies submit designs and they picked which one best suited their product. It's the same way with many parts whether it be mechanical, electrical, pneumatic, hydraulic, or anything else. Some companies use "off the shelf parts" while others design their own and contract other companies to make them.

It may be the markings on the IC are just lot numbers instead of anything useful.

 

there must be some source they are using for selecting this kind of IC, otherwise without datasheet they couldn't select perfect IC for their product.

hi PY,
They are custom designed chips for the manufacturer of the product and are given 'house' codes or numbers.
A custom designed chip can save a manufacturer a lot of money when building a large quantity of their product.

E

 

First, custom designed ICs may have data sheets but they are private because the custoner purchasing all the units of that kind paid for the development. It is also possible that it came from a IC company that only had it's products in manuals that are no longer available.

It may also be that the company building it into their product had them marked with a custom number. THAT is dome a whole lot because it makes it much more difficult to reverse engineer product.
These possibilities are in addition to those already mentioned..
Also, I have seen a very small operation where after the circuit boards were built, the original part numbers were erased off and other numbers written onto the IC. That company was a "one man show",

 

I worked for a small industrial service company and had one brand of stepper drive, in which the drive manufacturer had used a grinder to grind off all identifying marks of the IC's on their boards. They knew what they were, but it was a big secret not to be shared with outsiders. That forced any repair to made by the drive manufacturer.

 

I worked for a small industrial service company and had one brand of stepper drive, in which the drive manufacturer had used a grinder to grind off all identifying marks of the IC's on their boards. They knew what they were, but it was a big secret not to be shared with outsiders. That forced any repair to made by the drive manufacturer.

A clear and intentional violation of the "right to repair " law.
Those companies may find themselves an the forbidden materials list for some big organizations.

 

Are you certain about the S9517 part number?
9500 series could be ECL technology.

Maybe it is a hex buffer/driver or a 7-segment decoder driver.

If you have a request for information on any IC, post the part number and a photograph of the IC.
Also seeing the PCB and the unit from which the board was taken would help us to determine the function of the part.
Seeing the manufacturer's logo, IC package and number of pins will allow us to narrow it down much more quickly.

 

How can i find and learn about some ICs whose datasheets are not available on google.

for example S9517 IC ( i have seen it in an LED driver circuit).

is there any way to find out information of such ICs.

that IC is not available in any of the online store or IC search engines i know. that kind of many ICs i have seen in many products whose datasheet was not available online. How can i find that?

Can you share a picture of the device? or a product that the device was used in? What kind of package was used for it?

Look at this too: https://datasheetspdf.com/pdf/653541/SYNCPOWER/SPP9517/1

 

There is at least one search engine quite different from google that was strictly for searching electronic parts. That was quite a few years ago, but at the time it was awesome. And there was the EE Master that was exclusively IC devices, and it included a very comprehensive listing of device logos, the funny mark on an IC that supposedly tells who made that one. It was expensive to purchase at the time, but it included a useful amount of data on many thousand devices.

 

Are you certain about the S9517 part number?
9500 series could be ECL technology.

Maybe it is a hex buffer/driver or a 7-segment decoder driver.

If you have a request for information on any IC, post the part number and a photograph of the IC.
Also seeing the PCB and the unit from which the board was taken would help us to determine the function of the part.
Seeing the manufacturer's logo, IC package and number of pins will allow us to narrow it down much more quickly.

View attachment 259296

The circuit i have seen was the circuit of constant current buck LED driver. It's input is 230VAC, so it might not be the seven segment driver...

Photo of the driver is attached... It's a smart LED driver with motion sensor. IC has definitely a buck converter IC, i just want fine the equations for current sensing resistance and feedback resistance and other things of that driver, which is why i wanted to find the datasheet of that IC.

 

Can you share a picture of the device? or a product that the device was used in? What kind of package was used for it?

Look at this too: https://datasheetspdf.com/pdf/653541/SYNCPOWER/SPP9517/1

Here is the image of that driver.

It's definitely a constant current buck conveter IC with inbuilt MOSFET. I just wanted to know about the selection of Current sensing resistor and feedback divider and other things of that circuit.

 

There is at least one search engine quite different from google that was strictly for searching electronic parts. That was quite a few years ago, but at the time it was awesome. And there was the EE Master that was exclusively IC devices, and it included a very comprehensive listing of device logos, the funny mark on an IC that supposedly tells who made that one. It was expensive to purchase at the time, but it included a useful amount of data on many thousand devices.

Is that available currently? Or any similar search engine? I checked most of which was available while searching on Google.

 

We need a closeup of the chip that you are referring to.

 

We need a closeup of the chip that you are referring to.

Here is IC. The part number on it is not much visible in image. The part number on it is S9517 GA58CL OC.

 

Very often IC devices also have a date code.Is it possible that S9517 is a date code and the part number is GA58cl OC?. If this is not a very new device that might be possible.
AND I see that it appears to be a seven lead package, with pin 7 not present.

 

Very often IC devices also have a date code.Is it possible that S9517 is a date code and the part number is GA58cl OC?. If this is not a very new device that might be possible.
AND I see that it appears to be a seven lead package, with pin 7 not present.

Most buck converter ICs are in 7 pin packages as far as i have checked.

can you suggest me an IC with inbuilt MOSFET (>500V & 1A or more) with inbuilt PFC and PWM dimming?

 

IC FLS0116 looks like a match for the design i'm looking for, but there is a bit confusion about the power rating. can anyone tell if this IC is compatible with a 80.6VDC and 300 mA (about 24 watts) of supply?

I'm confused because the semiconductor company had posted a 2.7 watt LED driver example design on their site using the same IC.

And also this IC has analog dimming, is there any way to use PWM dimming in the same IC?

datasheet and the application link is here:

datasheet: https://www.mouser.in/datasheet/2/308/1/FLS0116_D-2313900.pdf
Application: https://www.onsemi.com/pub/collateral/an-febl032.pdf