THVD1500 Datasheet, PDF (18/29 Pages) Texas Instruments – 300 kbps RS-485 Transceivers With 8-kV IEC ESD Protection

THVD1500
SLLSEY4 – JULY 2017
www.ti.com
Typical Application (continued)
In the event of surge transients, high-energy content is characterized by long pulse duration and slow decaying
pulse power. The electrical energy of a transient that is dumped into the internal protection cells of a transceiver
is converted into thermal energy, which heats and destroys the protection cells, thus destroying the transceiver.
Figure 21 shows the large differences in transient energies for single ESD, EFT, surge transients, and an EFT
pulse train that is commonly applied during compliance testing.
1000
100
Surge
10
1
EFT Pulse Train
0.1
0.01
10^-3
EFT
10^-4
ESD
10^-5
10^-6
0.5
1
2
4 6 8 10 15
Peak Pulse Voltage (kV)
Figure 21. Comparison of Transient Energies
18
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