TPD1E10B09_15 Datasheet, PDF (8/18 Pages) Texas Instruments – Single-Channel ESD Protection Device in 0402 Package

TPD1E10B09
SLLSEB0D – FEBRUARY 2012 – REVISED SEPTEMBER 2015
8 Application and Implementation
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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
The TPD1E10B09 is a single-channel back-to-back diode that protects one bidirectional signal line from
electrostatic discharge and surge pulses. Because the diode is bidirectional, TPD1E10B09 protects signals that
have positive or negative polarity. During normal operation, the diode behaves as a 10-pF capacitance to ground.
Board layout is critical for optimal performance of any diode.
Placement: The diode should be placed very close to the external connector for optimal performance. Ideally, the
diode should be placed on the line that it is protecting.
Layout: Pin 1 of the diode should be right over the protected signal line. There should a thick and short trace
from pin 2 to ground. An example is shown in Layout.
8.2 Typical Application
A system with a human interface is 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. TPD1E10B09 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 ESD passes through the device, only a small voltage drop is present across the
diode structure. This is the voltage presented to the protected IC. The low R_DYN of the triggered TVS holds this
voltage, V_CLAMP, to a tolerable level to the protected IC.
L Audio IN
R Audio IN
Speaker
Connector
1
1
(Source of ESD)
2 GND 2
Audio Amplifier
Class AB
(ESD Sensitive)
L Audio
L
GND
Audio Amplifier
R Audio
Class AB
(ESD Sensitive)
R
GND
Figure 10. Typical Application Schematic
8.2.1 Design Requirements
For this design example, two TPD1E10B09s will be used to protect left and right audio channels. Table 1 lists the
known system parameters for this audio application.
Table 1. Design Parameters
DESIGN PARAMETER
Audio Amplifier Class
Audio signal voltage range
Audio frequency content
Required IEC 61000-4-2 ESD Protection
VALUE
AB
–8 V to 8 V
20 Hz to 20 kHz
±15-kV Contact/ ±15-kV Air-Gap
8
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