EMI2180

http://onsemi.com

4

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

IEC61000−4−2current 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 EMI2180 are shown in Figure 6.

Figure 4. Simplified Schematic of a Typical TLP System

DUT

L

10 MW

SW

÷

Oscilloscope

Attenuator

50 W Coax

Cable

50 W Coax Cable

Figure 5. Comparison Between 8 kV IEC61000−4−2 and 8 A and 16 A TLP Waveforms

Figure 6. Positive and Negative TLP Waveforms