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TPS40210-Q1: (also TPS40211-Q1) - available design tools

Andreas Lindner
Intellectual 420 points
Part Number: TPS40210-Q1
Other Parts Discussed in Thread: TPS40210, TPS40211-Q1, TPS40211

I'm just wondering - beside the Webbench Designer for TPS40210 are there any tools for calculating the circuits with these controllers? I'm thinking on an Excel Spreadsheet for it. 

As I didn't found such, I created my own with the formulas of the datasheet. But at multiple points I got doubts because of missing information or different results. Would be this forum the right place for discussing this issues in such high detail?

Thanks in advance for all answers!

  • 0
    TI__Guru* 78340 points
    Hi Andreas,

    Are you doing the boost, or flyback, with the TPS40211-Q1? I would like to suggest you to contact Garrett Roecker (garrett.roecker@ti.com) via email, and he may be able to help you with your calculator.

    Best Regards,
    Youhao
  • 0 in reply to Youhao Xi
    Intellectual 420 points
    Hi Youhao,
    I'm planning to use the TPS40210 and the TPS40211 in different boost configurations.

    Best Regards,
    Andreas
  • 0 in reply to Youhao Xi
    Intellectual 420 points

    Unfortunately, the email address you mentioned is not working. However, as it becomes more and more urgent, I'm placing my bunch of questions here:

    1. In equation (49) and (54) there is a parameter called 'Idrive' which is set to 0.5A for the example. It hasn't been introduced before, so I don't know its meaning or how it is calculated.
    2. I don't get the same result from equation (59) with the same parameters. It may be my fault, but could somebody verify that, please? My result is Zout = 0.208Ohm.
    3. In the same equation (59) is a frequency used which is set to 20kHz. Where does it come from?
    4. In equations (64) and (65) is another frequency used which is set to 30kHz. Where does it come from?
    5. From equation (48) I don't know the meaning of Vin(ripple). If we would have an ideal voltage source as power supply, there should be no ripple. In the real world we would need to know it's equivalent series resistor. So what is meant here?
    6. Figure 27 shows a schematic for a LED driver (current regulated booster). Beside the calculation of Rifb in equation (30), is there any difference in the design procedure shown in section 8.2.2 if using this type of schematic compared to a 'normal' voltage booster? I think of the compensation network, maybe?

    Again, thanks in advance for all answers!

  • 0 in reply to Andreas Lindner
    TI__Guru* 78340 points
    Hi Andreas,

    Very sorry for the mistake. The email should be g-roecker@ti.com. My answers to your questions:
    1.In equation (49) and (54) there is a parameter called 'Idrive' which is set to 0.5A for the example. It hasn't been introduced before, so I don't know its meaning or how it is calculated.

    A: Idrive is the driver current, 0.4A nominal and the estimated max current of 0.5A is used to determine the current sense resistor. The author should have used IGDR as labeled in the EC table to avoid confusion.

    2.I don't get the same result from equation (59) with the same parameters. It may be my fault, but could somebody verify that, please? My result is Zout = 0.208Ohm.

    A: The equation has typos. The crossover frequency should be 30kHz, but it used 20kHz in the equation. Replacing it with 30kHz you will get the answer of Zout=0.146Ohm

    3.In the same equation (59) is a frequency used which is set to 20kHz. Where does it come from?

    A: see above. It should be 30kHz.

    4.In equations (64) and (65) is another frequency used which is set to 30kHz. Where does it come from?

    A: See above.

    5.From equation (48) I don't know the meaning of Vin(ripple). If we would have an ideal voltage source as power supply, there should be no ripple. In the real world we would need to know it's equivalent series resistor. So what is meant here?

    A: It is the way to select input filter capacitor by assuming a very large input filter inductor is in place then only dc current flows from your source, and all ripple current components flows through the filter capacitor. This is the worst case to make sure you select the capacitor to always guarantee the ripple voltage would not exceed the value.

    6.Figure 27 shows a schematic for a LED driver (current regulated booster). Beside the calculation of Rifb in equation (30), is there any difference in the design procedure shown in section 8.2.2 if using this type of schematic compared to a 'normal' voltage booster? I think of the compensation network, maybe?

    A: You basically follow the same design procedure.


    Hope these help.

    Best Regards,
    Youhao