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  1. Replies
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    Closed: Re: IGBT Overshoot and Weird Slope

    The earthing cable should be a solid copper conductor of a certain cross-sectional area. You know it already. You're just ignoring it.

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    155539

    Even when you have a...
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    470

    Closed: Re: IGBT Overshoot and Weird Slope

    That rheostat must be a very large one. It must be having significant inductance and switching its current abruptly like that might be causing the spike across the SAAF IGBT. Do you mind comnecting a...
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    470

    Closed: Re: IGBT Overshoot and Weird Slope

    Let me elaborate more on this very point. Each of your HS drivers need a bootstrap circuit. Look at your schematic again. You need to rearrange the whole schematic.
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    Closed: Re: IGBT Overshoot and Weird Slope

    Hi,

    I will only point out things that I think may be direct contributors, so the list is not exhaustive but just a starting point.

    =Your IGBTs are not properly connected.
    =See the...
  5. Closed: Re: Multiplexer output width depends on SELECT

    This is basically connecting the output channel of a mux to the input channel of a demux. It is not going to be of any use because it is the same number of imput channels to the mux that you would...
  6. Closed: Re: Multiplexer output width depends on SELECT

    Hi,

    It could be done. The major challenge is having to detect which channels of the input data bus that bear information. Selecting those channels and connecting them to the output is simple -...
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    Closed: Re: PT100 interfacing with controller

    Hi,

    I have a couple of questions to ask you based on your schematic so I'll start from the left.

    1) Why did you leave the S+ terminal unconnected? Are you trying to implement a 3-wire...
  8. Closed: Re: SMPS feedback compensation..origin pole is "pole at origin"?

    For the type 2 compensator, it is usually sufficient to implement an inverted zero at fz1 without bothering about fp0. An inverted zero at fz1 determines the slope between fp0 and fp1.
  9. [SOLVED]Closed: Re: Inductor quality value for switching regulators

    There is AC resistance actually. That's one of the reason you would prefer 'multifilar' winding or litz wire to solid copper.

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    As a matter of fact, you need to calculate for...
  10. Closed: Re: Can't stop LTC3780EG Buck-Boost regulator from oscillating

    Congratulations on your success! I should have mentioned the bootstrap circuitry too.
  11. Closed: Re: Half bridge SMPS xformer turns calculation

    How did you select the core size? You need to follow through a series of steps to help you do a good selection.

    You would have a lot of hits from a single internet search.
  12. Closed: Re: Half bridge SMPS xformer turns calculation

    Hi,

    For Bmax of 1500mT, what core material are you using?
    For duty cycle of 0.98, how did you arrive at that figure?
    Also why are you calculating with the nominal value?

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    ...
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    Closed: Re: Voltage regulator... proportional?

    The truth here is just that we are just guessing to help you out. Like they say, a picture is worth a thousand words, a simple drawing can convey the entire message.

    I am thinking that the voltage...
  14. Closed: Re: Can't stop LTC3780EG Buck-Boost regulator from oscillating

    Hi,

    I know three things that can make your converter to oscillate that you might want to look at:

    1) your feedback loop
    2) your current sense resistor is too high and so your converter can't...
  15. [SOLVED]Closed: Re: Inductor quality value for switching regulators

    Hi,

    What you should do is go to the power loss density versus deltaB chart in the datasheet for the core that you hope to use and use the Empirical Steinmetz equation to determine the core loss...
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    Closed: Re: Voltage regulator... proportional?

    Hi,

    Just show a little sketch of your connection and we can help you improve it.

    I am having a feeling that the video transmitter being in parallel with your R2 in the voltage divider has an...
  17. [SOLVED]Closed: Re: Inductor quality value for switching regulators

    We cannot conclude on this just like that. It would depend more on what the dominant losses are for the inductor. Sometime eddy current and proximity losses dominate but they are not necessarily core...
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    [SOLVED]Closed: Re: DC-DC converter to -3.3v

    You need an inverting buck-boost. You could design it for 2.5V to 5V input range or so and -3.3V output.

    That's all.
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    Closed: Re: Switching regulator peak current

    Hi,

    If a switch is rated for 5A, that value has nothing to do with the actual current passing through the switch. The actual current going through the switch is dependent on the inductance and...
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    Closed: Re: Subtract two dc voltages.

    Although this, I believe, is not what the OP wants, I believe it is an oversight.

    The V probe of the meter should be connected to the +ve of the 9V battery and the COM probe of the meter to the...
  21. Closed: Re: Difference between Differentiators and Comparators

    Hi,

    In addition to what srizbf said, a differentiator detects transitions of the input signal. It produces a spike at the output when the input transitions.

    The comparator output switches from...
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    [SOLVED]Closed: Re: Failing to program ALTERA Max 7000A

    It's not very clear how you made the connections to the DIP40 board. The missing pins may be Vcc and GND but the connections from the pins of the DIP40 board to the pins of the PLCC socket are not...
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    969

    [SOLVED]Closed: Re: Failing to program ALTERA Max 7000A

    The board you are using, it is PLCC44 to DIP-what? Is it PLCC44 to DIP44 or PLCC44 to DIP40?

    That red wire connected to the JTAG connector doesn't look cool.
  24. Replies
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    [SOLVED]Closed: Re: Failing to program ALTERA Max 7000A

    You just showed the USB Blaster in post #7 instead of the header. If you do not have a header then it's possible you may have flipped some pins by mistake. You may have to confirm this again.

    - -...
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    [SOLVED]Closed: Re: Failing to program ALTERA Max 7000A

    Can you show a picture of your JTAG header?
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