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Original question:

[FAQ] Is there a calculation tool for TPS923655 / TPS923654 / TPS923653 / TPS923652?

TPS923655: Issue with calculating Inductor L calculation tool / datasheet

Eric Schunda
Prodigy 10 points
Part Number: TPS923655
Other Parts Discussed in Thread: TPS923652, TPS923651

Tool/software:

Hi,
I've checked the calculator:
https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1370127/faq-is-there-a-calculation-tool-for-tps923655-tps923654-tps923653-tps923652

However the inductor remains at 22µH despite changing parameters. Is there any other tool, can you help me please.

I want to use it in Buck-Boost configuration.
Vin (max) = 8,4V
Vin(min) = 5V
Vout = 6,2V
Iout = 350mA
f = 400MHz
Vd = 0,4V
Rsense = 350mOhm
Cin= 15µ
Cout = 20µ
Vrip = 200mV

Could some help please?

Best regards,
Eric

  • 0
    TI__Mastermind 23190 points

    Hi Eric,

    For the calculation tool, if you change the switching frequency to a higher value, the inductance value may vary. One thing to keep in mind is that the tool can only be used as a reference and you should adjust the component selection based on your actual requirements and according to the datasheet.

    For your application condition, I think TPS923652/3 is enough. Or you can consider using TPS923651/0.

    Best Regards,

    Steven

  • 0 in reply to Steven Li
    Prodigy 10 points

    Thanks again—I’ve re-downloaded the file, and it’s working perfectly now!

    On a different note, I’m working on switching between different LED strings. To achieve this, I’m considering placing an N-channel MOSFET between the cathode of the LED and Vin. Would this be a suitable approach? Also, I’m curious—what converter topology does this setup fall under? I haven’t used this configuration before and would love some insights.

  • 0 in reply to Eric Schunda
    TI__Mastermind 23190 points

    Hi Eric,

    Sorry, I am in all-day meeting today. I will reply to you tomorrow. Thanks for your understanding.

    Best Regards,

    Steven

  • 0 in reply to Eric Schunda
    TI__Mastermind 23190 points

    Hi Eric,

    Do you mean you want to add a series FET between the LED anode and VIN? Please double check.

    This device employs a floating-buck topology (which means the load are floating from the GND). It actually follows a similar calculation / design method (like the calculation of duty cycle, switching-on time, etc.) like normal Buck regulator.

    Best Regards,

    Steven