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Looking for LM3409(HV) Spreadsheet

waldek59
Prodigy 20 points
Other Parts Discussed in Thread: LM3409, LM3409HV

Hi,

Webench is a grateful tool for someone who begins his design. It helps to find the right device and other components. But I have already existing, ready to use circuit with LM3409(HV) including the PCB. Only what I would now to do is to adjust the values of Rd, Roff, Rsns and of the inductor (or work frequency) for various LEDs or LED chains in accordance to the parts I have already on stock. Therefore I’m looking for an Excel spreadsheet or other suitable software to playing with various component values for work only with the LM3409(HV) device. Does anyone have such a tool?

Thanks

  • 0
    TI__Intellectual 1685 points

    Hello,
      I'm not aware of a spreadsheet calculator for the LM3409HV part.  However, you can use WEBENCH LED Designer to customize the design including specifying the LED and the number of LEDs in series and parallel.  This is done on the first step of the WEBENCH LED Designer before the design is created.  If you do not find the desired LED in the listing, you can create a custom LED to your specifications.
      Once you create the design, you can also change the values for the various components in the bill of materials including Rsns, Roff and the inductor.  If you cannot find the specific component in the list of alternate parts, you can enter a custom component value.  You can then look at the updated operating values for the design to see the duty cycle, currents, power dissipations and efficiency for the circuit.  You can also run electrical simulations to view the dynamic behavior before and after the changes are made.  You can get more information about changing components in WEBENCH Designer at the following web site:
    http://www.ti.com/ww/en/analog/webench/help/training_videos.shtml
    The specific video is the 4th in the list: WEBENCH® Power Designer - BOM Management and How to Change Components
    Regards,
    Jeff Perry
    WEBENCH Manager

  • 0 in reply to Jeff Perry - WEBENCH Design Center
    Prodigy 20 points

    Hello Jeff,

    Thank you for your explanations. I do it now exactly as you describe - with Help of Webench. But it is not the best way for my need. I give you now an example:

    The Webench LM3409 result for the inductor is 18uH (at for example 1Mhz). I have no 18-33uH on stock, but I have over 1k pcs of 47uH and I want to use it. The Webench doesn’t  allow to change the inductor value - you can change the inductor manufacturer, mechanical sizes, resistance, prices, but not the most important value: inductance. Webench suggest sometimes other inductor values that are close to the first value, e.g. 22uH. Only you can play with reducing the working frequency in order to achieve other inductor values. This process takes sometimes many time and therefore I would like to have an excel spreadsheet to play directly with values I need to change. I hope that I have describe my example clearly, my English is not the best – sorry.

    Regards

    waldek59