Re: "Perfect" LED current limiting challenge
Posted: Wed Jan 18, 2006 4:25 pm
Chris
This is not to debate or deny your experimenting with various devices, but I have noticed in this post and several others, that you continully push devices to their limits and well beyond. It can be done occasioinally, as I have experimented with some of these myself, just out of curiosity. However, there is a lot to be said for the manufacturers maximum ratings.If you were to produce 100,000 units of the same type circuit,one would be very foolish to even begin to push the limits in the spec sheets (the chip maker has far more intrinsic knowledge of their products than any of us will ever have). By ignoring the maximum ratings, one could go bankrupt in less than a month after final production.
Jarhead
In looking at your graph, I see voltage and time axises. How did you determine the current pulses ? To reach 10 amps in 4 nanos would equate to a Di/Dt of 2500 amps per microsecond--a fantastic rate of rise. Any reactance present in the circuit- any at all-would severly limit this spec.
This is not to debate or deny your experimenting with various devices, but I have noticed in this post and several others, that you continully push devices to their limits and well beyond. It can be done occasioinally, as I have experimented with some of these myself, just out of curiosity. However, there is a lot to be said for the manufacturers maximum ratings.If you were to produce 100,000 units of the same type circuit,one would be very foolish to even begin to push the limits in the spec sheets (the chip maker has far more intrinsic knowledge of their products than any of us will ever have). By ignoring the maximum ratings, one could go bankrupt in less than a month after final production.
Jarhead
In looking at your graph, I see voltage and time axises. How did you determine the current pulses ? To reach 10 amps in 4 nanos would equate to a Di/Dt of 2500 amps per microsecond--a fantastic rate of rise. Any reactance present in the circuit- any at all-would severly limit this spec.