EMI4192
Transmission Line Pulse (TLP) Measurements
Transmission Line Pulse (TLP) provides current versus voltage (I ? V) curves in which each data point is obtained from a
100 ns long rectangular pulse from a charged transmission line. A simplified schematic of a typical TLP system is shown in
Figure 8. TLP I ? V curves of ESD protection devices accurately demonstrate the product’s ESD capability because the 10 s
of amps current levels and under 100 ns time scale match those of an ESD event. This is illustrated in Figure 9 where an 8 kV
IEC61000 ? 4 ? 2 current waveform is compared with TLP current pulses at 8 and 16 A. A TLP curve shows the voltage at which
the device turns on as well as how well the device clamps voltage over a range of current levels. Typical TLP I ? V curves for
the EMI4192 are shown in Figure 10.
L
50 W Coax
Cable
SW
Attenuator
÷
I M
50 W Coax Cable
V M
10 M W
V C
DUT
Oscilloscope
Figure 8. Simplified Schematic of a Typical TLP System
Figure 9. Comparison Between 8 kV IEC61000 ? 4 ? 2 and 8 A and 16 A TLP Waveforms
Figure 10. Positive and Negative TLP Waveforms
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