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汽车USB2.0端口集线器Short-to-Battery保护设计指南

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  • 日期: 2017-05-10
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标签: Short-to-Battery

  泰德- 00845是双端口USB 2.0集线器,能够在两个下游端口承受短暂的高达18 v直流,并具有针对过流情况和接地短路的级别4 IEC 61000-4-2 ESD保护。由集成保护器件TPD3S714-Q1提供该保护。凭借两个下游端口上的电池短路(机顶盒)保护,短路保护和固定电流限制负载开关,可使TUSB4020BI USB 2.0集线器与过压和过流情况相隔离,从而免受其损害。下游端口1包含一个用于应用18 v直流的机顶盒测试仿真器,以及两个TPD3S714-Q1,用于保护集线器和外设,以便轻松演示USB机顶盒保护功能。

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TI Designs TIDA00845 Reference Design of TwoPort Automotive USB 20 Hub with ShorttoBattery Protection 01 Design Overview TIDA00845 is comprised of the TUSB4020BIQ1 a twoport USB 20 hub with shorttobattery STB and shortcircuit protection on both downstream ports provided by the TPD3S714Q1 Downstream Port 1 DP1 includes a STB tester for applying 18V DC using two TPD3S714Q1s to protect both the hub and a peripheral for easily demonstrating pretest and posttest functionality Downstream Port 2 DP2 re......

TI Designs TIDA-00845: Reference Design of Two-Port Automotive USB 2.0 Hub with Short-to-Battery Protection 0.1 Design Overview TIDA-00845 is comprised of the TUSB4020BI-Q1, a two-port USB 2.0 hub, with short-to-battery (STB), and short-circuit protection on both downstream ports provided by the TPD3S714-Q1. Downstream Port 1 (DP1) includes a STB tester for applying 18-V DC, using two TPD3S714-Q1s to protect both the hub and a peripheral, for easily demonstrating pre-test and post-test functionality. Downstream Port 2 (DP2) represents a best practice design. 0.3 Design Features • Fully Functional USB Hub With Built-In Short-to- Battery Test Simulator on Downstream Port 1 • Supports USB 2.0 High-Speed Data Rates • Short-to-Battery Protection (up to 18 V) on VBUS_CON, VD+, VD- • Short-to-Ground Protection on VBUS_CON for Downstream Port 2 • Over-Current Protection Current Limit: 550 mA (min) IEC 61000-4-2 (Level 4) System Level ESD Protection at VBUS_CON, VD+, VD- Featured Applications 0.4 • Remote USB ports where short to battery is a concern such as Media Connection modules and Head Units with remote USB ports 0.2 Design Resources • TIDA-00845 TPD3S714-Q1 TUSB4020BI TPS7A4533 TPS74801 LMR14030 Design Folder Product Folder Product Folder Product Folder Product Folder Product Folder PowerPAD is a trademark of Texas Instruments. TIDUBG7A–May 2016–Revised May 2016 Submit Documentation Feedback TIDA-00845: Reference Design of Two-Port Automotive USB 2.0 Hub with Short-to-Battery Protection Copyright © 2016, Texas Instruments Incorporated 1 Key System Specifications www.ti.com An IMPORTANT NOTICE at the end of this TI reference design addresses authorized use, intellectual property matters and other important disclaimers and information. 1 Key System Specifications PARAMETER STB Response Time ESD Protection Built-in STB Tester Over-Current Protection Table 1. Key System Specifications SPECIFICATION TPD3S714-Q1 shuts off in 2 µs to protect the system from up to 18-V STB ±8-kV contact and ±15-kV air-gap per IEC 61000-4-2 Built-in demonstration of the STB protection on DP1 TPD3S714-Q1 limits current on VBUS to 550 mA DETAILS See Section 3.1 See Section 3.1 See Section 4.1.3 See Section 3.1 2 TIDA-00845: Reference Design of Two-Port Automotive USB 2.0 Hub with Short-to-Battery Protection Copyright © 2016, Texas Instruments Incorporated TIDUBG7A–May 2016–Revised May 2016 Submit Documentation Feedback www.ti.com 2 Automotive USB 2.0 Hub with Short-to-Battery and Short-Circuit Protection Automotive USB 2.0 Hub with Short-to-Battery and Short-Circuit Protection This automotive USB 2.0 hub has short-to-battery (STB), short-circuit, IEC 61000-4-2 ESD Level 4, and over-current protection. The USB 2.0 hub is the TUSB4020BI-Q1. The downstream ports (DP) are protected by the TPD3S714-Q1. DP1 includes a STB tester for demonstrating the protection from shorting the USB lines to 18-V DC. DP2 represents a best practice design for protecting a USB 2.0 hub with the TPD3S714-Q1. The upstream port (UP) has IEC 61000-4-2 Level 4 ESD protection provided by the TPD1E05U06. 2.1 2.2 2.3 2.4 TPD3S714-Q1 The TPD3S714-Q1 is a single-chip solution for automotive STB, short-circuit, IEC 61000-4-2 ESD, and over-current protection for USB 2.0 interfaces. The integrated data switches provide best-in-industry bandwidth for minimal signal degradation in USB 2.0 STB applications. The STB protection protects against shorts up to 18 V, in both hot-plug and DC events. The over-voltage protection reacts very quickly, shutting off the switches and protecting the upstream transceiver from harmful voltage and current spikes. The integrated ESD protection provides system-level IEC 61000-4-2 Level 4 protection. The over-current protection automatically limits current to 550 mA, preventing the voltage from drooping below specification of the upstream VBUS rail. TUSB4020BI-Q1 The TUSB4020BI-Q1 is a two-port USB 2.0 hub. It provides USB high-speed/full-speed connections on the UP, and provides high-speed, full-speed, or low-speed connections on the two DPs. When the UP is connected to an electrical environment that supports high-speed and full-speed/low-speed connections, high-speed and full-speed/low-speed USB connectivity is enabled on the DPs. When the UP is connected to an electrical environment that only supports full-speed/low-speed connections, high-speed connectivity is disabled on the DPs. LMR14030-Q1 The LMR14030-Q1 is a 40-V, 3.5-A step down regulator with an integrated high-side MOSFET. Featuring a wide input range from 4 V to 40 V, the LMR14030-Q1 is suitable for various applications from industrial to automotive, for power conditioning from unregulated sources. The regulator’s quiescent current is 40 µA in sleep-mode, suitable for battery-powered systems. An ultra-low 1-µA current, while in shutdown mode, can further prolong battery life. A wide adjustable switching-frequency range allows either efficiency or external component size to be optimized. Internal loop compensation means the user is free from the tedious task of loop-compensation design. This feature also minimizes the external components of the device. A precision-enable input allows simplification of regulator control and system-power sequencing. The device also has built-in protection features such as cycle-by-cycle current limit, thermal sensing and shutdown due to excessive power dissipation, and output over-voltage protection. TPS7A4533 The TPS7A4533 device is a low-dropout (LDO) regulator optimized for a fast transient response. The device can supply 1.5 A of output current with a dropout voltage of 300 mV. Operating quiescent current is 1 mA, dropping to less than 1 µA in shutdown mode. Quiescent current is well controlled; it does not rise in dropout as with many other regulators. In addition to fast transient response, the TPS7A45xx regulators have very low-output noise, making them ideal for sensitive RF supply applications. The output voltage is 3.3 V. The TPS7A4533 regulator is stable with an output capacitance as low as 10 µF. Small ceramic capacitors can be used without the necessary addition of ESR, as is common with other regulators. Internal-protection circuitry includes reverse-battery protection, current limiting, thermal limiting, and reverse-current protection. TIDUBG7A–May 2016–Revised May 2016 Submit Documentation Feedback TIDA-00845: Reference Design of Two-Port Automotive USB 2.0 Hub with Short-to-Battery Protection Copyright © 2016, Texas Instruments Incorporated 3 www.ti.com Automotive USB 2.0 Hub with Short-to-Battery and Short-Circuit Protection 2.5 TPS74801-Q1 The TPS74801-Q1 LDO linear regulator provides an easy-to-use, robust, power-management solution for a wide variety of applications. The user-programmable soft-start minimizes stress on the input-power source by reducing the capacitive inrush current on start-up. The soft-start is monotonic and well-suited for powering many different types of processors and ASICs. The enable input and power-good output allow easy sequencing with external regulators. This complete flexibility permits the user to configure a solution that meets the sequencing requirements of FPGAs, DSPs, and other applications with special start-up requirements. A precision reference and an error amplifier deliver 2% accuracy over load, line, temperature, and process. The device is stable with any type of capacitor greater than or equal to 2.2 µF, and is fully specified from –40°C to 105°C for the DRC package, and from –40°C to 125°C for the RGW package. The TPS74801-Q1 is offered in a small 3-mm × 3-mm SON-10 package, yielding a highly compact, total solution size. It is also available in a 5 × 5 QFN-20 for compatibility with the TPS74401. 2.6 TPD1E05U06 The TPD1E05U06 is a unidirectional transient voltage suppressor (TVS) based ESD protection diode with ultra-low capacitance. The TPD1E05U06 can dissipate ESD strikes above the maximum level specified by the IEC 61000-4-2 Level 4 international standard. The TPD1E05U06’s ultra-low loading capacitance makes it ideal for protecting any high-speed signal pins. 4 TIDA-00845: Reference Design of Two-Port Automotive USB 2.0 Hub with Short-to-Battery Protection Copyright © 2016, Texas Instruments Incorporated TIDUBG7A–May 2016–Revised May 2016 Submit Documentation Feedback www.ti.com 3 Block Diagram This automotive USB 2.0 hub with STB protection has two DPs. DP1 has two TPD3S714-Q1s arranged so that when the STB simulator is engaged, applying 18 V to either VBUS or the data lines, both the upstream hub and downstream peripheral are protected from the over-voltage. To accomplish this, the TPD3S714-Q1 protecting the peripheral attached to the USB 2.0 Type-A plug has the connector-side pins facing the hub, and the system-side data line pins facing the connector. The system-side data pins are not rated for IEC 61000-4-2 ESD, but for AEC-Q100 Classification H3 HBM of ±4 kV. To maintain IEC 61000-4-2 Level 4 ESD protection on the DP1, additional ESD protection has been added in the form of the TPD1E05U06, an IEC 61000-4-2 Level 4 rated ESD protection device. Despite the additional TPD3S714-Q1 and TPD1E05U06 on the DP1, the device is still capable of high-speed communication at 480 Mbps. Block Diagram Figure 1. TIDA-00845 Functional Block Diagram TIDUBG7A–May 2016–Revised May 2016 Submit Documentation Feedback TIDA-00845: Reference Design of Two-Port Automotive USB 2.0 Hub with Short-to-Battery Protection 5 Copyright © 2016, Texas Instruments Incorporated
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