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About the switching waveform of LM3463

Satoshi
Guru 19575 points
Other Parts Discussed in Thread: LM3463, TPS54531

6735.LM3463.pdf

About attached LM3463 switching waveform, the waveform of TP46 will not be normal?
 
Although I think that it becomes a square wave at the time of normal, is it satisfactory at such a waveform?

Moreover, if an adjusting point is shown in a circuit diagram, please let me know.
 
Thank you for your consideration.

 

  • 0
    Guru 19575 points

    Information is added to below.

    [Requirement specification]
    - Input voltage 16～18V
    - Load Vf=6.5V
    - Load If = 400 mA (constant current)
    - LM3463 uses only 1 ch.
    - Exterior PWM : 1 kHz

    [Supplementary information]
    - LED is an element single article and neither constant current nor a protection feature is attached.
    - Omit control which carries out current change from the outside.
    - There is no temperature current control.

    - Especially the reason the inductor constant of TPS54531 is 120μH is nothing (since it was indicated to the datasheet when what is necessary was just to have been 10μH or more, 120uH is chosen for the time being).