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  1. Replies
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    Closed: Re: NE555 astable frquency

    But by using your equation the frequency will be : 9 * 10^(-5) Hz !!
  2. Replies
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    Closed: Re: NE555 astable frquency

    Thank you for your answer!
    So the frequency is : f = 1.44 / ((R1 + 2*R2)*c) = 13KHz ?
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    Closed: Re: NE555 astable frquency

    Why is R2=5k?
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    Closed: NE555 astable frquency

    Hi,
    How do I calculate the frequency of this circuit?
    153952

    Thanks.
  5. Replies
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    1,666

    Closed: Re: 24V to 5V Buck converter

    The input voltage is fixed at 24V
    Output voltage : from 5V to 24V
    Imax > 200mA
    Frequency : 20kHz
    Duty cycle : 0% to 100% (not necessarily)

    Please suggest MOSFET to be used as a switch.
    Note...
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    Closed: Re: 24V to 5V Buck converter

    That was corrected by using another of mosfet (2N7002 instead of IRF54), now I should design the control loop, any suggestions are welcome.

    I have another question : How to calculate the...
  7. Replies
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    Closed: Re: Are DC to DC converters a type of SMPS?

    The wikipedia article says that buck, boost, buck boost... are SMPS but a doctor at my university once told me that they are just DC-DC converters not SMPS, that's why I am asking.
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    Closed: Re: 24V to 5V Buck converter

    I added a LED in series with the load.
    153474

    Thank you.
  9. Replies
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    Closed: Are DC to DC converters a type of SMPS?

    Hi,
    Does DC-DC converters like buck, boost, buck boost... belong to switched-mode power supply?

    Any replies from you are really appreciated!
    Sincerely,
  10. Replies
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    Closed: Re: 24V to 5V Buck converter

    Thank you for your response.
    After simulating the circuit using the values you provided, i got the same previous result (Higher output voltage).

    153466

    Have a nice day.
  11. Replies
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    1,666

    Closed: Re: 24V to 5V Buck converter

    I want to make a discontinuous conduction mode (DCM).
  12. Replies
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    1,666

    Closed: Re: 24V to 5V Buck converter

    It is a white LED so the Vf must be between 3.3V and 5V.
  13. Replies
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    1,666

    Closed: Re: 24V to 5V Buck converter

    No, I want at least 20mA to turn a LED on.
  14. Replies
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    Closed: Re: 24V to 5V Buck converter

    Here is the modified circuit:
    153455

    The same problem persist.

    The multivibrator is 2.2kHz and the duty cycle is 30%.
  15. Replies
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    1,666

    Closed: Re: 24V to 5V Buck converter

    The switching frequency is 20kHz.
  16. Replies
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    1,666

    Closed: Re: 24V to 5V Buck converter

    Because that answer doesn't solve my probleme.
  17. Replies
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    Closed: Re: 24V to 5V Buck converter

    Yes I did.
  18. Replies
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    1,666

    Closed: Re: 24V to 5V Buck converter

    What could be the reason for the high output voltage?
  19. Replies
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    1,666

    Closed: Re: 24V to 5V Buck converter

    Thank you for your fast response.
    The circuit still doesn't work even after applying higher voltage.
  20. Replies
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    Closed: Re: 24V to 5V Buck converter

    The gate driver voltage is 10V.


    How to do that?
  21. Replies
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    Closed: 24V to 5V Buck converter

    Hi,
    I want to design a simple buck converter that convert a 24V input to a 5V output.
    I made a schematic but it doesn't work, it gives a higher output voltage (even when I reduce the duty cycle to...
  22. Replies
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    Closed: Re: [SMPS]Flyback converter

    Thank you for your response, it was very helpful.
    Could you explain with more details the functioning of the transformer?
    Have a nice day.
  23. Replies
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    Closed: [SMPS]Flyback converter

    Good morning,
    Could anyone please clarify for me how this flyback circuit work?
    You'll find attached the circuit and the properties of the transformer TR1.
    153440153441

    P.S: this circuit...
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