DocID022589 Rev 2

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AN4022

TLP measurements

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Figure 19. TLP measurements comparison with triangular waveform (forward

polarity)

Conclusion

To be sure a circuit design will be robust against electrostatic discharges, it is important to

anticipate the maximum voltage that can appear at the I/O’s of the sensitive circuits.

Knowing the dynamic characteristic of a transient voltage suppressor used for their

protection is a key point during the design.

We have shown in this note that this dynamic characteristic, measured with a short pulse,

not necessarily TLP, allows accurate prediction of the remaining voltage across the TVS,

especially after the first spike of a standard surge such as that defined in IEC61000-4-2,

where the circuit to protect is the most sensitive.

It2 = 9.8009 A

Issb = 9.7159 A

Vt1 = 1.1049 V

Vh = 1.1049 V

Ron = 0.90419 ohm

It2

Vt1

Forward

Triangular waveform

TLP

DUT voltage (V)

Leakage current (A)

10

9

8

7

6

5

4

3

2

1

0

02

468

10

10

-12

10

-10

10

-8

10

-6

10

-4

10

-2