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Low Power LED Driver

This question is answered
Jainam.Shah
Posted by Jainam.Shah
on Apr 22 2012 03:01 AM
Prodigy100 points

Hello All,

I am working on a project for LED Lighting.
My Project specifications are:

Input - 100V~245v AC
Frequency - 50/60Hz
Output - 19.2V / 0.78A
Power in output for LED(6 LED's) - 15W

Right now I am working on to design a circuit.Can anyone suggest me about LED Driver which convert AC to DC.
I have thought about to use of LED Driver TPS92210 for the circuit.

Thanking You & Regards,
Jainam Shah.

15W LED Driver
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  • Lisa Dinwoodie
    Posted by Lisa Dinwoodie
    on Apr 23 2012 10:17 AM
    Genius11850 points

    Do these LEDs require dimming?

    Lisa Dinwoodie

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  • Jainam.Shah
    Posted by Jainam.Shah
    on Apr 23 2012 23:12 PM
    Prodigy100 points

    Hello,

    Yes,LED's require dimming.
    and one thing more is that the circuit should be constant current.

    If you find any other LED Driver which is more compatible to my project,please suggest me.

    Thanking You & Regards,
    Jainam Shah.
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  • Lisa Dinwoodie
    Posted by Lisa Dinwoodie
    on Apr 24 2012 08:28 AM
    Genius11850 points

    Personally, I am partial to the TPS92070 Integrated Dimming LED Lighting Controller.  There are two EVMs available and I have a MathCAD file that steps through the design process if you decide it could suit your needs.

    Lisa Dinwoodie

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  • Jainam.Shah
    Posted by Jainam.Shah
    on Apr 24 2012 09:24 AM
    Prodigy100 points

    Thank you for your reply and suggestion.

    I would like to go for TPS92070. and as you told me about a MathCAD file,it will be my pleasure if you can share it with me.

    I want to ask you if I attach an image here which i have designed using some sources,is it possible for you to suggest me something on that?
    If you find any changes in that please guide me for that.
    I have gone through the pdf of TPS92070 but it shows that its of 16 pin and i have designed my circuit with 8 pins.Is it fine if i use TPS92070 in place of that.
    Kindly guide me for that.
    Thanking You & Regards,
    Jainam Shah.3652.Schematic Print.pdf
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  • Lisa Dinwoodie
    Posted by Lisa Dinwoodie
    on Apr 24 2012 13:50 PM
    Genius11850 points

    The circuit for the TPS92070 will be very different than the TPS92210 you have shown in your schematic.  There is a design calculator for the TPS92210 (TPS92210_DESIGN_CALC)  that you could verify your design with. 

    I am presently having technical difficulties with MathCAD, I will reply shortly with the MathCAD file as soon as I win this battle...

    Lisa Dinwoodie

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  • Lisa Dinwoodie
    Posted by Lisa Dinwoodie
    on Apr 24 2012 15:06 PM
    Genius11850 points
    TPS92070 design calculator.xmcd

    Here is my MathCAD file that I used for the TPS92070 designs

    Lisa Dinwoodie

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  • Jainam.Shah
    Posted by Jainam.Shah
    on Apr 24 2012 23:29 PM
    Prodigy100 points

    Thank you so much for your quick response.

    I have gone through the documents you have shared with me.

    Should I have to continue with the TPS92210 or start a new design with TPS92070?
    Can you please suggest me anything related to my design?what should I have to change to use LED Driver TPS92070?
    I am working on design with the use of calculator you shared,but still I need your help to choose the driver.
    I am really grateful to you for your kind help.
    Thanking You & Regards,
    Jainam Shah.
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  • Jainam.Shah
    Posted by Jainam.Shah
    on Apr 25 2012 04:31 AM
    Prodigy100 points

    Hello,

    I didnt find any program to review .xmcd(MathCAD) file.

    Can you please suggest me any software or viewer for that.

    Thanking You,

    Jainam Shah. 

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  • Lisa Dinwoodie
    Posted by Lisa Dinwoodie
    on Apr 26 2012 10:29 AM
    Verified Answer
    Verified by Jainam.Shah
    Genius11850 points
    Mathcad - TPS92070 design calculator.pdf

    The file requires MathCAD but here's a pdf version.  Unfortunately, it won't be interactive like the MathCAD version but you can still see the equations in the pdf version.

    The driver selection is purely dependent upon what features the final product requires.  Each of the controllers will work well in their appropriate application.  You need to review the features of each to decide which one suits your overall needs.

    Lisa Dinwoodie

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  • Jainam.Shah
    Posted by Jainam.Shah
    on Apr 26 2012 23:12 PM
    Prodigy100 points

    Thank you so much Lisa Dinwoodie for your kind support.

    It will help me much to design my final circuit.I am very grateful to you.

    One last question to ask :
    May I get your help to verify that the circuit which I have designed is perfect or not?Can I share with you the final circuit after all the changes?
    If it is possible for you then please help me out in that.
    I will share the circuit diagram here as soon as I will make it for final design. :)
    Thanking You & Regards,
    Jainam Shah.
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  • Lisa Dinwoodie
    Posted by Lisa Dinwoodie
    on Apr 30 2012 11:50 AM
    Genius11850 points

    Unfortunately, because the Application group is limited in size but our customer base is worlwide and vast, we do not have the ability to review every customer application.  We focus on specific issues and develop design tools and rely on the field applications support team for verifying customer's specific designs.  You could send it to me but I will not  be able to do an in-depth analysis of it and would rather have you contact your local field apps.

    Lisa Dinwoodie

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  • Jainam.Shah
    Posted by Jainam.Shah
    on May 01 2012 07:14 AM
    Prodigy100 points

    That's really fine with me.

    I will make some analysis on my own and after completion of my Project I will share here with others.
    Thank You for your help Lisa Diwoodie. :)
    All the best for Future. 
    With Best Regards,
    Jainam Shah.
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