Recent content by OutToLunch

  1. O

    Multimeter

    This is just one perspective - so take it for what it is worth, but I only use my DMM for reading AC voltage, DC voltage, impedance testing, audible continuity testing, diode testing and on rare occasions I will use the ammeter functionality. I also use the LCD backlighting quite a bit as well...
  2. O

    Resistor wattage

    i suppose i'm looking at this from a different perspective. every where i have ever worked has attempted to squeeze as much wattage per square/cubic inch as they possibly could while at the same time adhering to safety and shipping standards. At the last place I worked, if I had placed a...
  3. O

    Resistor wattage

    you've gone off into tangential land - a resistor is not a FET.  Still, though, depending on the architecture of the SMPS, I would usually recommend starting with a FET that has a max voltage rating at least twice that of the input rail.
  4. O

    Resistor wattage

    Lifetime reliability would also be in question - reliability of the resistor in question and surrounding components that will be absorbing that heat. I suppose I would fall into the category of wasting 50% of the potential of the resistors I use cuz I always derate by that much. You always want...
  5. O

    Half bridge driver

    isn't the lower mosfet just acting as the freewheel diode does when the upper switch is off? it's not applying a braking force to the motor, just providing a low impedance path for the current. I would agree that the boot circuit was not implemented properly. Also - where is the decoupling...
  6. O

    missing some basic theory

    I LOVE that analogy!
  7. O

    the voltage drop across an Inductor instead of a Res. for current adjust.

    The use of inductor current sensing is actually becoming more and more the norm with multiphase buck regulators that supply power to a PC processor. It has been around for awhile but it's main use has been to create a droop in the output as the load is increased. There are a number of advantages...
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