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Type: Posts; User: treez

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  1. Closed: Doing electronics on an office carpet (non ESD)

    Hi,
    My friend is doing electronics with no esd mats on the desks or floor or anything. Its an an office with a (non esd) office carpet.
    He's handling FETs and ICs and DCDC modules.

    Do you...
  2. Closed: Relative sensitivity of various electronics components to ESD damage?

    Hi,
    Which ones of the following electronic components are more sensitive to ESD damage than the others.? Can you rate these in order of most ESD sensitivity?

    1…DCM3623T50M53C2T00 DCDC module...
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    Closed: EP13 transformer core looks open

    Hi,
    The EP13 ferrite core set looks like it wont enclose the windings and give a closed magnetic circuit.....eg like an etd set would.

    Do you know why the core is "Open"?

    EP13 core...
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    Closed: LEM current monitor for DC current?

    Hi,
    The ACS772 hall effect current monitor family can measure up to DC 400A, but its abs max current is DC 250A…As such, we are looking at the LEM LF 505-S Hall sensor…

    LEM LF 505-S Hall...
  5. Closed: Dont need a super accurate, super high bandwidth In Amp...

    Hi,
    We wish to compare two voltages and see which is highest, and get a rough measurement of the difference. We came up with the attached circuit.
    Its cheaper than an In Amp….eg we could just use...
  6. Closed: Re: A "separated double pole switch with a single throw" ( two separate switched cct

    Thanks, i mean like a DPST but the poles not serving the same circuit
  7. Closed: Recomended input filter for IS1215A DCDC module?

    Hi,
    The ISE1215A DCDC module , on the last page of its datasheet, has a recommended input filter which comprises an inductor at its input, with no capacitor downstream of it…..
    Surely this is...
  8. Closed: A "separated double pole switch with a single throw" ( two separate switched ccts)

    Hi
    Is there any such thing as a rocker switch which switchs two circuits from the one actuator? (whats it called?)

    (ie we want to switch a circuit with several amps in it, but also want an...
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    Closed: Power Mosfet parameter "IA"?

    Hi,
    In the IXFN360N10T datasheet, do you know what is “IA” parameter?..ie whats its meaning? (its 100A). The parameter definitions (below ) doesn’t tell it.

    IXFN360N10T datasheet...
  10. Closed: Relative Robustness of power semiconductors (generally)

    Supposing I have a 10mF electrolytic capacitor which has been slowly charged up to 50V via a 27k resistor.
    I then short it directly to ground with either ….

    a)…a TO247 Gate turn off thyristor...
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    Closed: Re: LiPO battery cell voltage and temperature

    Thanks, we are buying a lipo with internal cell balancing included.
    Its strangely impossible to find out how lipo battery voltage varies with temperature....eg a fully charged 12 cell lipo....
    ...
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    Closed: LiPO battery cell voltage and temperature

    Hi,
    Supposing you have a 16Ah 12 cell LiPO battery.

    Supposing we charge it up to 47V (3.91V/cell)

    We will simply charge it with constant current of 13A up to 47V, then keep it at 47V (Our...
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    Closed: Re: 240A in a 50A Hall sensor?

    Thanks wwfeldman...i feel a bit like the "not" person though...always coming up with the "other" side......because in the reverse direction we may have large or small current flowing, but only...
  14. Closed: Re: UC3854 PFC controller working principle and IC block diyagram

    Hi Ivan
    It is very conscientious of you to worry about the multiplier etc…and of course very interesting….but many can implement Average current mode boost PFC and not bother with how the...
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    Closed: Re: Load switch with high gate current drive?

    Thanks,
    The LM74700 is a good part, thanks for sharing it.
    However, in our case, the “diode OR” function is not what we seek….the LM74700 would allow the battery to supply the load in cases of...
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    Closed: Re: 240A in a 50A Hall sensor?

    Thanks, the sensor is just 100 microohms, so its not going to overheat the device.
    At the end of the day we were wondering if a denser magnetic field is going to damage something in there.

    We...
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    Closed: Re: 240A in a 50A Hall sensor?

    Thanks,
    It’s a case of “will the stronger magnetic field” cause some type of “saturation” in the Hall sensor?
    …Or will the output voltage (of the Hall sensor device) just “rail high” at maximum...
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    Closed: 240A in a 50A Hall sensor?

    Hi,
    Supposing 240A goes through the ACS772LCB-050U-PFF-T Hall effect current sensor. Will it simply give an output which is at the Vcc rail?
    The sensor is only meant to measure up to 50A.
    ...
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    Closed: Re: Load switch with high gate current drive?

    The PSU wont drop out for long periods no...it will stay at 47.5-50VDC (depends on loading as it has 'droop sharing) unless it fails...or a temporary transient occurs
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    Closed: Re: Load switch with high gate current drive?

    Thanks, actually we don’t ever want the battery to supply the load in normal case…the battery is solely for times when the PSU would drop out for a few hundred milliseconds due to a heavy load...
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    Closed: Re: Load switch with high gate current drive?

    Thanks, yes we are toying with just using diodes...since the battery is only for use for brief transient dropouts, and also for when the PSU fails....so its disaster management...so...
  22. Closed: Re: UC3854 PFC controller working principle and IC block diyagram

    UC3854 is same as LT1248 mostly...so to understand it, run the sim in ltspice that i attach
  23. Closed: Re: References on flyback transformer construction

    if you are only getting 0.1T peak, then it suggests you can go down a size in transformer.
    The primary, for an offline flyback is usually split, as BiswAITH says.........some people put the...
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    Closed: Re: Load switch with high gate current drive?

    Here is the Load switches as attached.
    The FETs used will actually be IRFP4468.
    Its an awful lot of TO247 FETs....and needs all the comparators and latchs etc as there appears to be no IC for this.
  25. Closed: Re: Is it necessary to wear anti-static overcoats when working on electronics?

    Thanks, as such, i presume a woolly jumper is ok as long as it doesnt touch the PCB you're working on?
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