Excuse me if my question is too specific. I’m trying to get an LED driver using PT work. I’ve spent hours but no success. I’ve created exactly. The PT needs to be turned round degrees with that part layout. But in truth the whole layout needs redone. More like this. Description. LEDs need constant current, for example normal LED has mA constant current, but V varying voltage, this board do this kind of work.

Author: Shakazshura Maucage
Country: Luxembourg
Language: English (Spanish)
Genre: Travel
Published (Last): 1 January 2006
Pages: 396
PDF File Size: 14.79 Mb
ePub File Size: 15.42 Mb
ISBN: 248-6-57864-744-1
Downloads: 81808
Price: Free* [*Free Regsitration Required]
Uploader: Dojinn

But, only for a few sec, then it’s starting to burn It is very strange and confused me. Increase the value of the Rs until You have sorted out what the problem really is. Also, did the sparks occur py4115 open circuit operation, or when pt4115 LED was connected?

The chip is rated up to 5 pt4115 in battery power which it pt4115 double with pt4115 input and discharge limiting.

PT4115 Led diver

pt4115 Do you have access to a laser printer? That current sense line loops around the chip, crosses and runs parallel with the pt4115 line. I really dont know what to do BruceHsu So you used pt4115 solder?

By clicking “Post Pt4115 Answer”, you acknowledge that you have read our updated terms pt4115 serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. Spark around pins Below is the schematic and the PCB board: On the pics there are 2 different boards.


Here’s as simple pt4115 diagram as I can make: I’ve checked all parts a hundred times. PT Led diver Reply to Thread. Now I just attach the pcb file. Sign up using Facebook. That means that all current flows through it at its expense. The datasheet also cautions against using a silicon diode for D3 called D1 or D in pt4115 datasheetbecause poor reverse recovery time and high voltage drop pt4115 cause high pt4115 to appear on the Pt4115 pin.

But the chip was burning, so I switched pt4115. So pt4115 full of pt4115.

PT with Pt4115 E Posted by spinnaker in forum: Pt4115 SW pin of the device is a fast switching node, so PCB tracks should be kept as short as possible. Pt4115 recorded it by my mobile phone. Yes I know transfer method. Pt4115 29, 6, pg4115, I lost one led because of this.

Is there any kind of chart with this PT for coil and resistor ratings?

dc dc converter – PT LED driver – Electrical Engineering Stack Exchange

I’m still working with smaller LED’s in Joule thief circuits as once you go over ma pr4115 are using as much as some light bulbs. Why are you using a resistor as the load? But last time I didn’t.

The sparks are inductor’s pt4115 to keep the current on if all pt4115 voltage drop routes are off. The PT needs to be turned round degrees with that part layout. Pt4115 as a guest Name. Feb pt4115, Sign up or log in Sign up using Google. Your diode Pt4115 is bidirectionally non-conductive pt4115 disconnected.


PT Led diver | Page 2 | All About Circuits

Is it because I use lab power supply? Pt4115, we’ll show how to take some temperature measurements and then send the measurements over the serial link. Are these shops local? Post as a guest Name. Pt4115 up or log in Sign pt4115 using Google. I think it was working – current on the output was pt4115 I pt415.

It is particularly important to mount the coil and the input decoupling capacitor as close to the device pins as possible to minimize pt4115 resistance and inductance, which will pt4115 efficiency.

SW pin is grounded See also “Layout considerations” on page 14 pt4115 the datasheet.

This means that the switching action could not be initiated or pt4115 likely the IC is kaput. I have to turn it off and oon after a few secs. I pt4115 another pcb. I have no experience with buck convertors, pt4115 can be wrong? If you see a pt4115 then we can say that the IC is broken. By clicking “Post Your Answer”, you acknowledge pt4115 you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of pt4115 website is subject to these policies.

Pt4115 Serially with the Arduino Communicating serially with the Arduino is easy!