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  1. Replies
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    Closed: Re: Inrush current limiter

    For 24V you may be best off with a current limiting IC, or 'load switch' or 'soft start controller'.

    FPF2700 is one example in this category.

    It's also possible to use a simple discrete...
  2. Closed: Re: Opamp buffer with 400nF output capacitance going unstable?

    The 4.7R may be doing its job then. You could short its output and watch it recover - a simple step response test to get a sense of stability.


    I'll say that this isn't theoretical. I've...
  3. Closed: Re: Differences between the Artix 7 xc7a35tcpg236-1 vs Stratix III EP3SL150F1152C2 FP

    I think we've had this discussion before but for the midrange designs I do I much prefer Vivado and its full integration (FPGA is about 1/4 of my job).

    I took an Altera design for the first time...
  4. Closed: Re: Differences between the Artix 7 xc7a35tcpg236-1 vs Stratix III EP3SL150F1152C2 FP

    #4 is often #1.

    Would you generally agree that Altera/Intel and Xilinx are fairly similar in the midrange? On the low end Xilinx doesn't compete with MAX10 and on the high end Altera's SOC is...
  5. Closed: Re: Seeking: 3400uF 50VAC or greater low loss, tan-delta < 0.01 say

    I don't really know what space this is in, frequency etc. I'm assuming mains.

    They do make bipolar electrolytic though I'm not clear if they're suited for continuous AC use or not....
  6. Closed: Re: Opamp buffer with 400nF output capacitance going unstable?

    You can handle 'a bit of sinking' with just a pull down.
  7. Closed: Re: Opamp buffer with 400nF output capacitance going unstable?

    Among the various C load compensation schemes your R scheme is about the simplest. The reference I linked has some equations to verify stability for your R scheme (which apply if the C load is well...
  8. Closed: Re: Opamp buffer with 400nF output capacitance going unstable?

    See this document for many strategies to compensate for C loads. The "In-Loop Compensation" is nice as it adds no error (this is what dick was describing)....
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    Closed: Re: How to achieve Vref changing with Vdd

    We can’t help unless you provide the relationship you need between “vref” and “vdd”. If you don’t know post your circuit schematic.

    Common possibilities: you need a fixed difference in which...
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    [SOLVED]Closed: Re: DC-to-DC Converter question

    Using a DC-DC converter output as your reference is probably a poor choice because its noisy and poorly regulated. It's also wasteful to cascade DC-DC converters (especially isolated ones) unless...
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    [SOLVED]Closed: Re: type 1 compensation in voltage regulators

    Correct. The compensator is a part of the total system that includes DC feedback.
  12. Closed: Re: What is saturation current of ELC09D-221 (220uH) inductor?

    Reference the L vs I curves on page one. Saturation is usually defined as a 20-40% drop in inductance.

    EDIT: Nevermind that appears to be a part selection guide. I've also never seen an inductor...
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    Closed: Re: How to generate sine wave using Verilog?

    Consider that the derivative (slope) of sin is cos and the derivative of cos is sin. Thus you can increment one by a value proportional to the other and you get a self-oscillating output that's a...
  14. Closed: Re: "Current" controle is a big issue using ClassD ?

    Well it seems the OP wants to control current: "Since my project need to get Current transformer output"...and current mode control is a great way to do that.

    Generally current mode control...
  15. Closed: Re: Reverse recovery losses in synchronous rectifier

    This also won't answer your question: What I think is that it doesn't matter too much. The future for a mostfet that's on is that some day it's going to be turned off. At that point any positive...
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    Closed: Re: Dc/Dc controller LT8316 power limit

    To be clear I don't think there is a 100W limit. The 100W number is Analog/Linear trying to be realistic and helpful (and they sell controllers better suited for higher power).

    12V is fine for...
  17. Closed: Re: Longer deadtime or blanking time between two mosfets of one leg phase U or v or w

    Speaking with class-D/inverter experience but not motors: yes dead time creates distortion. When neither fet is on the result may be high, low or somewhere in between. The uncertainty creates...
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    Closed: Re: Dc/Dc controller LT8316 power limit

    100W is often considered the upper useful limit for a flyback.

    Flybacks make relatively poor use of the transformer meaning its size increases quickly with power. Around 100W other topologies...
  19. Closed: Re: Reverse recovery losses in synchronous rectifier

    Other people may give you the semiconductor physics but I'll point out that the 'ON' isn't where reverse recovery comes into play. There are no losses when you turn on the fet and add a channel...
  20. Closed: Re: Relay substitution and other help with Solar powered plant watering machine

    The relay switches the motor right? A mosfet can easily do this too. Easiest to do on the 'low side'.
  21. Closed: Re: NPN having its VBE protected against reverse voltage....but unecessary?

    Other question: 12V to 8.3V at 10mA and you need this circuit?

    You could:
    Remove the NPN altogether and supply 10mA from the opamp directly
    Remove the opamp too and supply 10mA from the TL431...
  22. Closed: Re: SMD Sync Buck converters with parallel FETs and no heatsinks

    What about the SMT heatsink? It's just another SMT part that comes right off the line.

    Ok here is the app note I was looking for. This has Tja for DPAK (page 33) versus copper area from...
  23. Closed: Re: SMD Sync Buck converters with parallel FETs and no heatsinks

    Speaking from experience of a recent paralleling fail the problem with paralleling small SMT parts is the watts density. They must be close for good performance so the result is minimal decrease in...
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    [SOLVED]Closed: Re: Protect FPGA Pin from negative voltage

    A resistor alone is often enough to protect against voltage (by limiting current to below the specified limit, often 10mA).
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    Closed: Re: Live and neutral reversed issue

    Devices will function but its less safe. As an example light-bulbs are designed so the outside threaded metal part is neutral which you might touch while unscrewing it. Normally its safe, in your...
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