By A. Bruce Carlson
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The only place I ever found it being used was as the inrush current limiting resistor of AC-DC power supplies, because in that location there are no high-frequency harmonics to deal with. But you will be surprised how many junior engineers initially try to use a wirewound as a high-frequency current sense resistor in their AC-DC prototypes. They learn quickly enough though! One common use for wirewound resistors seems to be as the load for a converter. I also use that configuration when doing thermals to simulate the customer’s system and for noise and ripple measurements.
After some eloquent hand waving and a cursory explanation, he would ask me to quickly build his fascinating new idea. ). At which point Doc would lean over excitedly to touch the exposed transistor heatsink. indd 15 7/23/2007 12:06:50 PM Chapter 1 followed. Luckily, the building was almost vacant by the time his scream hit the walls. Good thing too, because that’s the only way we could continue to put on a brave face during normal office hours for weeks thereafter. It became our own private little secret!
Here dI/dt is the slope of the current edge, and L is the inductance associated with the trace section. Let’s do the math here. A typical DC-DC converter may switch several amperes in 20ns. The rule of thumb for PCB trace inductance is 20nH per inch. So if we switch 1A through 1 in. of trace, we will get 1V of kickback. A switch of 2A will give 2V and so on. Depending upon where the offending PCB section is located, we could get voltage spikes being applied to the pins of the IC. This could affect pin thresholds and cause erratic behavior.