LED Drivers/LCD Bias

Browse by Tags

LED Drivers/LCD Bias

Welcome to the LED Drivers/LCD Bias Section of the TI E2E Support Community. Ask questions, share knowledge, explore ideas, and help solve problems with fellow engineers. To post a question, click on the forum tab then "New Post".

Tags
You have subscribed to this tag. To view or manage your tag subscriptions, click here.   Close
You have unsubscribed from this tag. To view or manage your tag subscriptions, click here.   Close
You are currently viewing:
tps61500
Related Posts

  • Forum Post: Re: tlc5940 with higher current LEDs

    Chris Glaser
    This app note is applicable to the TLC5940 also: http://focus.ti.com/lit/an/slva253/slva253.pdf We also have high current LED drivers in a boost topology, such as the TPS61500.
    on Mar 30, 2010

  • Forum Post: tps61500 at 12v being driven by a 3v MCU

    Elliott Johnson
    So, I'm using a tps61500 to drive a string of 1.5A LEDs in serial, I've implemented a similar circuit using the TPS61500EVM-369 using the supplied LEDs and a 3v power supply and 3v MCU to provide a PWM signal. However for the 1.5A LEDs my calculations indicated a 9v or larger supply...
    on Dec 29, 2010

  • Forum Post: Led drivers for an art project: tps61500 and tps40211

    Alexander Jenal
    Hello, I have a question concerning a led driver design for an art project. I need to drive several (76) led stripes. It is planned to switch the stripes one after another in about 20 sec. The stripes are ready-made bought from a supplier. Each stripe has an individual length and consists of several...
    on Jan 14, 2011

  • Forum Post: TPS61500 problems

    Andreas Pabst
    Dear support team / Dear Community, We have a problem concering the TPS61500. Below you will find a description of our project and our problem. We are working in a project for a diploma thesis. The goal of this project is to build a lamp which is able to emit light in most colors of the...
    on Feb 28, 2011

  • Forum Post: Re: TPS61500 problems

    Andreas Pabst
    Dear Jeff, Thank you for your fast reply. I am a little bit confused now. I recalculated the values for R1, R2, Rfb to get 38 Vovp (Over voltage protection). Based on the formula from the Datasheet (Equation 1) I calculated 29.7k for R1 and 1k for R2. Furthermore i...
    on Mar 16, 2011

  • Forum Post: Re: TPS61500 problems

    Andreas Pabst
    Hello Jeff, Thanks again for your help with our TPS61500 problems. We now have sucessfully implemented Analog Dimming. Our circuit is supplied with 12V as Vin and is in position of dimming 8 Argus Red Osram Golden Dragon Power LEDs, which are supplied with 0.8A. The brightness of the LEDs...
    on Apr 2, 2011

  • Forum Post: TPS61500 DC-DC boost converter

    haribel
    Dear Sir I have developed DC - DC boost converter for LED Lighting using TPS61500 . I am connecting six 1 watt LED in series at the current rating of 360 mA . So total watts of about 6 watts is loaded . My main problem is to reduce the heat developed in the IC and in capacitor .I have developed...
    on Feb 15, 2012

  • Forum Post: tps61500evm-369 efficiency

    Roger Sellgren
    The efficiency of the demo board isn't what I would expect. At 6V in it draws 1.5A and the LED current is only 0.5A. Everything seems to be working, output voltages, over-voltage etc. The waveform at TP1 is a square wave switching between 0 and about 17V. 800nsec at 17V, 1.4usec at 0V. I'm thinking...
    on Apr 14, 2012

  • Forum Post: Re: tps61500evm-369 efficiency

    Michael Day
    You will need to measure efficiency without PWM dimming. You can then do a weighted average to calculate your operating efficiency. Without PWM dimming, you can expect to get the measured results published in the TPS61500 EVMs User's Guide. Refer to http://www.ti.com/lit/an/slva236/slva236.pdf for...
    on Apr 15, 2012

  • Forum Post: Re: tps61500evm-369 efficiency

    Roger Sellgren
    Michael: This is an eval board and the PWM dutycycle is 100 % which is selected with a jumper on the board. The currents were measured according to the recommended mode with a large capacitor on the input (Buck mode) and a current meter. The currents were also confirmed with a scope current probe to...
    on Apr 16, 2012

  • Forum Post: Re: tps61500evm-369 efficiency

    Roger Sellgren
    Actually I didn't, I wasn't sure what the verify did... Now I know!!
    on Apr 16, 2012

  • Forum Post: Re: tps61500evm-369 efficiency

    Michael Day
    No problem. We ask the original poster to verify a post when it clarifies their question or solves their problem. Can I ask you attach a file with your measured data so we can take a closer look at your measurements. Also, what efficiency were you expecting?
    on Apr 16, 2012

  • Forum Post: Re: tps61500evm-369 efficiency

    Roger Sellgren
    I didn't actually record the earlier readings as they were so far off. I just remeasured them again with the input voltage at 4.998V. I have a 46uF cap on the input. With a B&K 390 VOM I measure 2.10 A input. With JP2 open I measure 0.50A LED current. With JP2 installed I measure 199.0 mV across...
    on Apr 16, 2012

  • Forum Post: Re: tps61500evm-369 efficiency

    Roger Sellgren
    Michael: It finally dawned on me that we are talking about Power. I was focused on current which is obviously incorrect... DA. Thanks for you help and enlightenment. Roger
    on Apr 17, 2012

  • Forum Post: RE: TPS61500 - Problem with LED current : 20mA instead of 400mA

    Brigitte
    Hello Guillaume, Which input voltage are you using? What voltage do you have on the output of the converter? Is it possible that the part is in overvoltage? Is it possible that the inductor is going into saturation? Normally your setup should work. It is best to have all GND potentials at the...
    on Jun 25, 2012

  • Forum Post: RE: TPS61500 - Problem with LED current : 20mA instead of 400mA

    Brigitte
    Hello Guillaume, I expect that you got the parts in a moisture barrier bag and that bake before reflow was given if the parts saw moisture during their history or the bag is open for some time. Bake means that you put the part for several hours at 125°C before they are soldered. I do not expect...
    on Jun 25, 2012

  • Forum Post: RE: TPS61500 - Problem with LED current : 20mA instead of 400mA

    Brigitte
    Hello Guillaume, When you measure 20mA through the LEDs and there is just 0.2mA on the feedback pin, I wonder if this pin is shorted to GND. Normally with 20mA through the LEDs, you should measure around 10mA on the feedback pin because of the voltage drop on the external resistor. Please check the...
    on Jun 27, 2012

  • Forum Post: RE: TPS61500 - Problem with LED current : 20mA instead of 400mA

    Brigitte
    Hello Guillaume, Many thanks for the update. I hope you meant: This was not a chip problem but a design problem? Best regards, Brigitte
    on Jun 28, 2012

  • Forum Post: RE: Vision machine lighting; constant current regulator or led driver?

    Chris Glaser
    Yes, this is the right forum for your request. The LED driver you use would depend on your input voltage. If you want to create a strobe you can see, then you will need to design your LED driver to handle that amount of power (100mA) in steady state. You would just do PWM dimming at a very low frequency...
    on May 2, 2013

  • Forum Post: Ext MOSFET for TPS61500 to let it supply 60V output

    Sky Lee
    Hi, Currently we are designing TPS61500 for their 40V LED driver, we plan to modify it to 60V output, but understand that TPS61500 has an internal MOSFET that limit the Voltage to 40V. Is it possible to add an external MOSFET on this IC to let it handle higher output Voltage? or any suggestion...
    on May 15, 2013

All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.

Content on this site may contain or be subject to specific guidelines or limitations on use. All postings and use of the content on this site are subject to the Terms of Use of the site; third parties using this content agree to abide by any limitations or guidelines and to comply with the Terms of Use of this site. TI, its suppliers and providers of content reserve the right to make corrections, deletions, modifications, enhancements, improvements and other changes to the content and materials, its products, programs and services at any time or to move or discontinue any content, products, programs, or services without notice.

TI Worldwide | Contact Us | my.TI Login | Site Map | Corporate Citizenship | mobile m.ti.com (Mobile Version)

TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs and
embedded processors, along with software, tools and the industry’s largest sales/support staff.

© Copyright 1995-2013 Texas Instruments Incorporated. All rights reserved.
Trademarks | Privacy Policy | Terms of Use