Voltage Burnout/Meltdown Detection Circuitry
Original Publication Date: 1988-Jun-01
Included in the Prior Art Database: 2005-Feb-15
A high-current test applies a high-amplitude current pulse to burn open catastrophic height/width reductions on printed circuit lines. The burnout detector serves to detect the initiation of burnout and shuts the high-current pulse off to prevent board damage. If burnout started to occur during the last several microseconds of the pulse, it would not be necessary to shut down the pulse as the shutdown would occur imminently. However, it is important to detect whether the line started to melt because it may not necessarily burn open, but the line may be of questionable reliability. Prior-art burnout detectors have responded to a sudden decrease in current and have not been able to detect burnout or meltdown during the last several microseconds of the pulse.