Search:

Type: Posts; User: Akanimo

Page 1 of 20 1 2 3 4

Search: Search took 0.01 seconds.

  1. Replies
    2
    Views
    390

    Closed: Re: Transistor Spice Model Design

    You're going to get the data from the MOSFET datasheet and then you're going to create a model.

    What SPICE simulator are you using?

    There is a helpful video you can learn from. See "How to...
  2. Replies
    22
    Views
    1,757

    Closed: Re: buck inductor losses

    I couldn't open the pdf and the website is not very good looking.
  3. Replies
    22
    Views
    1,757

    Closed: Re: buck inductor losses

    Please post a link to the datasheet.
  4. Replies
    22
    Views
    1,757

    Closed: Re: buck inductor losses

    Hi,

    You could use the core loss density graph presented for the core material. Trace the loss density at your switching frequency and multiply it by the core volume to get the core loss.

    What...
  5. Replies
    20
    Views
    1,995

    Closed: Re: Counter cİrcuİt (3 forward 2 back)

    Simulation result: requirement met.
    157057

    Code:


    CODE VHDL

    LIBRARY IEEE; USE IEEE.STD_LOGIC_1164.ALL;
  6. Replies
    20
    Views
    1,995

    Closed: Re: Counter cİrcuİt (3 forward 2 back)

    I'm sorry. I meant cnt_int = 0...
  7. Replies
    8
    Views
    1,321

    Closed: Re: Clarification on RMS value

    Ratch is right too. If the waveform is symmetrical, the the effect that the positive excursion has will be the same as that of the negative excursion.

    - - - Updated - - -

    Notice that he...
  8. Replies
    20
    Views
    1,995

    Closed: Re: Counter cİrcuİt (3 forward 2 back)

    I now get the point that you are considering cnt_int = 0 as the reset state and you start the count from cnt_int = 1. I was considering cnt_int = 1 to be the start of the count.

    Clear doubts that...
  9. Replies
    6
    Views
    1,038

    Closed: Re: PIR sensor project

    Hi,

    Why do you want to detect a stationary object? Like somebody placed it there in the hours when the system was inactive?

    A rotating PIR sensor would most likely be triggering haphazardly,...
  10. Replies
    20
    Views
    1,995

    Closed: Re: Counter cİrcuİt (3 forward 2 back)

    It doesn't seem to me like this is going to work. I see a conflict on cnt_int, especially because of where you chose to place the expression in line 4.

    Also realize that the logic is sequential,...
  11. Replies
    20
    Views
    1,995

    Closed: Re: Counter cİrcuİt (3 forward 2 back)

    If you need to count up and down in an incremental fashion, then you would add an up-down counter to the circuit. Increment the up-down counter when direction signal is forward and backward-forward...
  12. Replies
    20
    Views
    1,995

    Closed: Re: Counter cİrcuİt (3 forward 2 back)

    Hi,

    It is quite simple to implement this. You need to have a counter, a direction signal and a comparator. Of course you would need clock and reset signals. Now, when the direction is forward, you...
  13. Replies
    34
    Views
    2,626

    Closed: Re: Flyback controller explain

    In addition, datasheet specifications are made with some percentage of confidence - 90%, 95%, or so.

    Having 5% of the cards fail depicts a choice that have been made by the designer on a parameter...
  14. Replies
    10
    Views
    1,371

    Closed: Re: How many devices can we have on SPI?

    Also, you will be limited by the complexity in connection and routing that comes with increased number of slave devices. The traces too are going to.get longer as slave devices increase.
  15. Closed: Re: Confusion with relating the sensor output voltages from its datasheet

    Hi,

    A lot of the relationships are ratiometric which means that you have to set out your specifications first.

    What is your supply voltage?
  16. Replies
    34
    Views
    2,626

    Closed: Re: Flyback controller explain

    Okay.

    Let me also add that one known cause of hiccup in smps is overload.

    Please explain to us what you're referring to by saying that the circuit works fine when you replace controller.
  17. Replies
    34
    Views
    2,626

    Closed: Re: Flyback controller explain

    Hi,

    I'm surprised that you haven't gotten help till now. I just hurriedly looked at the datasheet for the IC but I have to go to work.

    Take a look at the datasheet pages 15 and 16.

    - - -...
  18. Replies
    34
    Views
    2,626

    Closed: Re: Flyback controller explain

    The shape of the green waveform seems like your 'transformer' is saturating.

    By noise in this case, did you mean audible noise?
  19. Replies
    34
    Views
    2,626

    Closed: Re: Flyback controller explain

    Please show the MOSFET gate voltage.
  20. Replies
    34
    Views
    2,626

    Closed: Re: Flyback controller explain

    Hi,

    The essence of soft start is to make the converter start slowly with very low duty cycle and then rise gently to steady state.

    With low duty cycle, the primary current (and of course the...
  21. Replies
    5
    Views
    1,301

    [SOLVED]Closed: Re: Regarding UC3844 IC used for PWM switching

    The UC3844 has a maximum duty cycle clamped at 50%, so if your switching frequency is 42kHz, then your oscillator frequency should be set a 2*42kHz = 84kHz. Hope you considered that.


    The sensed...
  22. Replies
    25
    Views
    1,583

    Closed: Re: Issue with relay and snubber

    OMG! I'm sorry to ask this question. I should be asking what the current rating of the relay contact is.
  23. Replies
    5
    Views
    1,301

    [SOLVED]Closed: Re: Regarding UC3844 IC used for PWM switching

    Hi,

    The Isense pin senses current indirectly. The current that you want to sense has to be made to flow through a resistor of suitable value, called current-sense resistor. This resistor has to...
  24. Replies
    25
    Views
    1,583

    Closed: Re: Issue with relay and snubber

    What resistor and capacitor values are you using?
  25. Replies
    25
    Views
    1,583

    Closed: Re: Issue with relay and snubber

    Hi,

    I would suggest you check for continuity of the relay terminals to determine the NO, C and NC terminals of the relay. It seems to me like you have mistaken NC for NO.
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4