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How to protect automotive USB Type-C™, USB 3.0 and USB 2.0 ports against short-to-Vbus/battery events USB Short-to-Vbus/Battery competitive analysis
How to protect automotive USB Type-C™, USB 3.0 and USB 2.0 ports against short-to-Vbus/battery events
USB Short-to-Vbus/Battery competitive analysis
The last section of this training will cover an USB short-to-VBUS and short-to-battery competitive analysis. On this slide, we will cover a USB Type-C competitive analysis, comparing a discrete solution versus our TPD6S300. Some of the challenges with a discrete protection solution is that it involves a large solution footprint of more or less 8 to 12 discrete components, it adds complexity for system design, and it adds extra complexity in routing.
TI provides the family of USB Type-C and PD protection solutions, which protect pins from shorts to the 20 volts VBUS and 12 volts car battery, IEC 61000-4-2 and ISO 10605 ESC protection for high speed, VBUS protection for 5 volts power path, fast response time to protect downstream processors and controllers, a single-chip protection solution, and it adds and provides a smaller footprint, simplified routing, BOM and system design.
Now, we will discuss a USB 2.0 VBUS D+ and D- short-to-battery competitive analysis, comparing our TPD3X71x versus Competitor A. As you can see on the table on the left, TI provides best in class two times higher bandwidth by providing 1 gigahertz of differential bandwidth compared to 450 megahertz from the only solution out in the market today for a 3-channel short-to-battery protection solution for USB 2. This is important for customers in order to support USB 2.0 high speed data rates.
TI also provides better short-to-ground protection. The industry needs this feature since a poor short-to-ground protection and can allow substantial amounts of current through and burnout the upstream 5 volt rail. Since the competition cannot keep the shared 5 volt rail stable and properly isolated from faults, it brings down and resets multiple ICs in USB systems. TI also provides 20 times faster and more reliable short-to-battery isolation. This feature is unique for USB applications since it improves system protection by turning the power off from the system side in 200 nanoseconds instead of 4,000 nanoseconds from the competition.
Continuing with our competitive analysis of our TPD3S71x versus Competitor A, the integrated data switches provided by the TPD3S71x family provide best in class bandwidth for minimal signal degradation during USB short-to-battery events. The high bandwidth of 1 gigahertz allows for a clean USB 2.0 high speed 480 megabits per second eye diagram with the long [INAUDIBLE] cables that are common in the automotive USB environment.
In this example, we show an example using a 6-foot test cable, comparing part only and system level adding a CMC for EMI filtering, and inductors for inductive tuning. A typical automotive USB 2.0 system is shown at the bottom of the slide, which compares Competitor A with the TPD3S71x eye diagram showing improvement on eye diagram performance thanks to the higher bandwidth provided by the data switches.
USB 2.0 D+ and D- Competitive Analysis. On this slide, we will compare our TPD2S703 versus Competitor B. The TPD2D703 is a 2-channel data line short-to-battery, short-to-VBUS, and ESD protection device for automotive high speed interfaces, such as USB 2.0. Some of the pros for this solution are being able to provide different package options such as QFN and [INAUDIBLE] SSOP package. It provides a full pin. Clamping voltage during short-to-battery is better, does not leave DC voltage on system side during a short-to-battery event.
Clamping voltage during ESD is significantly better as well. It allows adjustability of OVP and signal threshold, as well as providing a short-to-battery max threshold up to 18 volts. And it's also tested against the ISO 10605 330 picofarad 330 ohm ESD, and passes 8kV contact and 15 kV air gap. Shown here is a system clamping waveform during short-to-battery events. As you can see on the left, the TPD2D703 clamps around 5.2 volts during a short-to-battery event of 14 volts.
On the right, Competitor B clamps around 10.9 volts during a short-to-battery event of 14 volts. TI provides an adjustable OVP trip point, 2 times better clamping voltage during short-to-battery and ESD events, which allows and gives flexibility for various processors, depending on their sensitivity for OVP events. TI also provides IEC 61000-4-2 and ISO 10605 330 picofarad 330 ohm ESD standards, as well as having the option for a fault output signal.
April 17, 2017
Currently two sources provide the only solutions on the market for USB Short-to-Battery protection in the automotive space. Due to being the only sources, this has enabled their devices to carry many sub-optimal specifications and features which system designers are required to work around. This presentation will focus on the five main issues with the current short-to-battery products in the market and demonstrate how TI’s USB Short-to-Battery solves their problems.