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  1. Replies
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    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.
  2. 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?
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    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.
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    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.

    - - -...
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    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?
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    Closed: Re: Flyback controller explain

    Please show the MOSFET gate voltage.
  7. Replies
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    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...
  8. 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...
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    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.
  10. 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...
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    Closed: Re: Issue with relay and snubber

    What resistor and capacitor values are you using?
  12. Replies
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    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.
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    Closed: Re: minimize function using K-Map

    Hi,

    You are correct. It should be !B.!C.D.!E
    May be a typo.
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    [SOLVED]Closed: Re: uc384x PWM DC-DC converter not regulating.

    That's about double of what I gave you (91k & 5k). With 100k+86k+4.7k combination, you are using resistances somewhere between 180k and 181k for the upper divider resistor and 9.9k and 10k for the...
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    [SOLVED]Closed: Re: uc384x PWM DC-DC converter not regulating.

    Codemaster, please change topology.

    Se SEPIC, cúk and noninverting buckboost topologies.
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    [SOLVED]Closed: Re: uc384x PWM DC-DC converter not regulating.

    Your Vfb should be 2.5V. The feedback pin is the inverting terminal of the error amplifier. The noninverting terminal is connected to a 2.5V reference.

    - - - Updated - - -

    Unfortunately, your...
  17. Replies
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    [SOLVED]Closed: Re: uc384x PWM DC-DC converter not regulating.

    Hi,

    You need to implement a voltage divider at the output to derive a voltage that is equal to the reference voltage of the error amplifier.

    Consider using 91k and 5k with 1% tolerance or...
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    [SOLVED]Closed: Re: uc384x PWM DC-DC converter not regulating.

    Hi,

    First of all, your choice of divider resistors to derive Vref of 2.5V from 48V output is not adequate. Even if you adjusted the trimmer to the bottom, you'd have 2.697V whereas you need 2.5V....
  19. Closed: Re: 12v DC proximity detector for use on truck (2-3 feet range)

    Hi,

    I don't seem to get the story. Are you saying that your truck gets hit while it is parked in the parking lot? Is that your concern?
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    [SOLVED]Closed: Re: Ohm's Law and Power calculation problem

    You can also model what you are doing with SPICE.
  21. Replies
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    [SOLVED]Closed: Re: Ohm's Law and Power calculation problem

    What is the essnce of C1?
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    [SOLVED]Closed: Re: Ohm's Law and Power calculation problem

    Sorry, I missed that.

    If I may ask, why are you measuring voltage at that node? If you want to filter, I think you should divide before you filter rather than have those caps connected like that....
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    [SOLVED]Closed: Re: Ohm's Law and Power calculation problem

    In addition to what klaus has said, P is not UUR. P is UU/R.
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    Closed: Re: current-mode boost converter UC3845

    The noise you're hearing is inductor saturation.

    - - - Updated - - -

    Your major issue seems to be your duty cycle. Your duty cycle may be saturating. uc3845 has maximum of 46% or thereabout...
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    Closed: Re: SMPS power stage bode plot

    Hi mtwieg,

    We were discussing only the dc gain of the control-to-output transfer function for buck converters. We did not need to include poles and zeroes and, additionally, there is no RHPZ for...
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