GND

Speaker

Connector

(Source of ESD)

1

1

2

2

L Audio IN

Audio Amplifier

Class AB

(ESD Sensitive)

R Audio IN

L

R

Audio Amplifier

Class AB

(ESD Sensitive)

GND

GND

L Audio

R Audio

TPD1E6B06

SLLSEB2E – FEBRUARY 2012 – REVISED OCTOBER 2015

www.ti.com

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

When a system contains a human interface connector, it becomes vulnerable to large system-level ESD strikes

that standard ICs cannot survive. TVS ESD protection diodes are typically used to suppress ESD at these

connectors. TPD1E6B06 is a single-channel ESD protection device containing back-to-back TVS diodes, which

is typically used to provide a path to ground for dissipating ESD events on bidirectional signal lines between a

human interface connector and a system. As the current from an ESD event passes through the TVS diode, only

a small voltage drop is present across the diode structure. This is the voltage presented to the protected IC. The

low RDYN of the triggered TVS holds this voltage, VCLAMP, to a tolerable level to the protected IC.

8.2 Typical Application

Figure 10. Audio Application Schematic

8.2.1 Design Requirements

For this design example, two TPD1E6B06s will be used to protect left and right audio channels. For this audio

application, the following system parameters are known.

Table 1. Design Parameters

DESIGN PARAMETER

VALUE

Audio amplifier class

AB

Audio signal voltage range

–3 V to 3 V

Audio frequency content

20 Hz to 20 kHz

Required IEC 61000-4-2 ESD protection

±8 kV Contact and ±15kV Air-Gap

8.2.2 Detailed Design Procedure

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

•

Voltage range on the protected line must not exceed the reverse standoff voltage of the TVS diode(s) (VRWM).

•

Operating frequency is supported by the I/O capacitance CIO of the TVS diode.

8

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