The TPD4E05U06-Q1 is a diode type TVS which is typically used to provide a path to ground for dissipating ESD events on hi-speed signal lines between a human interface connector and a system. As the current from ESD passes through the TVS, only a small voltage drop is present across the diode. This is the voltage presented to the protected IC. The low RDYN of the triggered TVS holds this voltage, VCLAMP, to a safe level for the protected IC.
For this design example, two TPD4E05U06-Q1 devices, and a TPD5S116 are being used in an HDMI 1.4 application. This provides a complete port protection scheme.
Given the HDMI 1.4 application, the parameters in Table 1 are known.
|Signal range on pins 1, 2, 4, or 5||0 V to 5 V|
|Operating frequency||1.7 GHz|
To begin the design process, some parameters must be decided upon; the designer needs to know the following:
The TPD4E05U06-Q1 has 4 identical protection channels for signal lines. The symmetry of the device provides flexibility when selecting which of the 4 I/O channels protect which signal lines. Any I/O will support a signal range of 0 to 5.5 V.
The TPD4E05U06-Q1 has a capacitance of 0.5 pF (Typical), supporting HDMI 1.4 data rates.