Time (nS)

-15

15

45

75

105

135

165

195

225

-10

0

10

20

30

40

50

60

70

80

90

Time (nS)

-15

15

45

75

105

135

165

195

225

-90

-80

-70

-60

-50

-40

-30

-20

-10

0

10

TPD1E10B09

www.ti.com

SLLSEB0D – FEBRUARY 2012 – REVISED SEPTEMBER 2015

8.2.2 Detailed Design Procedure

To begin the design process, some parameters must be decided upon; the designer should make sure:

•

The voltage range on the protected line does not exceed the reverse standoff voltage of the TVS diode(s)

•

•

The IEC 61000-4-2 protection requirement is covered by the IEC performance of the TVS diode.

therefore, the bidirectional TVS will not break down during normal operation, and normal operation of the audio

signal will not be affected due to the signal voltage range. In this application, a bidirectional TVS like

TPD1E10B09 is required.

Next, consider the frequency content of this audio signal. In this application with the class AB amplifier, the

frequency content is from 20 Hz to 20 kHz; ensure that the TVS I/O capacitance will not distort this signal by

filtering it. With TPD1E10B09 typical capacitance of 10 pF, which leads to a typical cutoff frequency of just under

500 MHz, this diode has sufficient bandwidth to pass the audio signal without distorting it.

Finally, the human interface in this application requires protection for ±15-kV Contact and ±15-kV Air-Gap ESD,

which is above the standard Level 4 IEC 61000-4-2 system-level ESD protection. A standard TVS cannot survive

this level of IEC ESD stress. However, TPD1E10B09 can survive at least ±20-kV Contact and ±20-kV Air-Gap

ESD. Therefore, the device can provide sufficient ESD protection for the interface, even though the requirements

are stringent. For any TVS diode to provide its full range of ESD protection capabilities, as well as to minimize

the noise and EMI disturbances the board will see during ESD events, it is crucial that a system designer uses

proper board layout of their TVS ESD protection diodes. See Layout for instructions on properly laying out

TPD1E10B09.

8.2.3 Application Curves

Figure 11. ESD Clamp Voltage +8-kV Contact ESD

Figure 12. ESD Clamp Voltage –8-kV Contact ESD

Copyright © 2012–2015, Texas Instruments Incorporated

Submit Documentation Feedback

9

Product Folder Links: TPD1E10B09