SLLSE33E August   2010  – December 2016 TPD7S019

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

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. The TPD7S019 provides IEC61000-4-2 Level 4 Contact ESD rating to the VGA or DVI-I port. The integrated voltage level-shifting, buffering and termination reduce the board space needed to implement the control lines functions.

8.2 Typical Application

TPD7S019 typapp_llse33(1).gif Figure 6. Typical Application Schematic with TPD7S019

8.2.1 Design Requirements

In this application, the TPD7S019 is used to protect the VGA port. Table 1 lists the system parameters.

Table 1. Design Parameters

DESIGN PARAMETER VALUE
Pull-up resistors on DDC lines 1.5 k‎Ω to 2 k‎Ω
Termination resistors on VIDEO lines 50 Ω to 75 Ω
VIDEO signals data rate 24 MHz to 388 MHz
Required IEC 61000-4-2 ESD Protection ±8-kV Contact

8.2.2 Detailed Design Procedure

To begin the design process, some parameters must be decided upon; the designer must 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
  • IEC 61000-4-2 protection requirement is covered by the IEC performance of the TVS diode

For this application, the DDC signals switch between 0 V and 5 V (with resistor pulling it up to 5-V power supply). The VIDEO and SYNC signal levels are between 0 V and VCC_VIDEO / VCC_SYNC. All signals are not exceeding the recommended values and the ESD cells on these pins stay untriggered.

Depending on the resolution and the refresh rate of the display, the VIDEO (RGB) signals' bandwidth can be from 24 MHz to 388 MHz. The line capacitances from the ESD cells are 2.5 pF typical which is only takes up a small portion of the total capacitance budget for the maximum frequency in this range.

±8-kV Contact ESD provided by the TPD7S019 meets the ESD design goal of ±8 kV contact.

Put 1.5-k‎Ω to 2-k‎Ω pullup resistor on the DDC lines to be compliant with the I2C standard. Termination resistors on VIDEO lines are 50 Ω to 75 Ω to match the impedance on board trace.

8.2.3 Application Curves

TPD7S019 g_amplitude_time_llse33.gif Figure 7. IEC 61000-4-2 Clamping Voltage, Positive Contact
TPD7S019 g_amplitude_time_neg_llse33.gif Figure 8. IEC 61000-4-2 Clamping Voltage, Negative Contact