EMI8041, EMI8042, EMI8043
www.onsemi.com
5
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 4. 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 5 where an 8 kV
IEC61000−4−2 current waveform is compared with TLP current pulses at 8 A 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 EMI804x are shown in Figure 4.
L
SW
50 W Coax Cable
10 MQ
V
C
Attenuator
÷
I
M
50 W Coax Cable
V
M
DUT
Oscilloscope
Figure 4. Simplified Schematic of a Typical TLP System
Figure 5. Comparison Between 8 kV IEC61000-4-2 and 8 A and 16 A TLP Waveforms
18
16
14
12
10
8
6
4
2
0
02 1816141246810
I (A)
V
clamp
(V)
0 −2 −18−14−12−4 −6 −8 −10
V
clamp
(V)
−18
I (A)
−16
−14
−12
−10
−8
−6
−4
−2
0
Figure 6. Positive and Negative TLP Waveforms
−16
