TPD4S014EVM [TI]

Over-voltage protection functionality; 过电压保护功能


型号：	TPD4S014EVM
厂家：	TEXAS INSTRUMENTS
描述：	Over-voltage protection functionality 过电压保护功能
文件：	总5页 (文件大小：301K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

User's Guide

SLVU471–June 2011

TPD4S014 EVM

Introduction

The TPD4S014 is a single-chip solution for USB

charger port protection. This device offers low

capacitance TVS type ESD clamps for the D+, D–

and standard Capacitance for the ID pin. On the

VBUS pin, this device can handle over-voltage

protection up to 28V. The over voltage lock-out

feature ensures that, if there is a fault condition at

the VBUS line, the TPD4S014 is able to isolate

the VBUS line and protect the internal circuitry

from damage.

Similarly, the under voltage lock out feature

ensures that there is no power drain from the

internal VCC plane to external VBUS side in case

there is short to GND. There is a 16ms turn-on

delay after VBUS crosses the under voltage

lockout threshold, in order to let the voltage

stabilize before closing the switch. This function

acts as a deglitch filter and prevents unnecessary

switching if there is any ringing on the line during

connection.

Highlighted Features

•

Over-voltage protection functionality

Under voltage lockout functionality

USB connectors used for ease of use

LED indicating fault condition

Test point for EN and ACK signals

D+, D– lines are routed as differential pair

Bottom section of board can be used for measurement of bandwidth and ESD performance.

EVM Description and Configuration

The TPD4S014EVM consists of two separate sections, the TOP section and the BOTTOM section. Both

these sections are powered up by a 1.8V – 3.3V supply. This supply is used for three purposes:

1. To provide the HI and LO logic levels for the EN signal

2. To provide a pullup voltage for the open drain ACK signal

3. To power the fault indicator LED

The TOP section consists of the USB connectors. The connector on the Left (marked INPUT) connects to

the VBUS of the TPD4S014 and the one of the right (marked OUTPUT) connects to the VCC of the

SLVU471–June 2011

TPD4S014 EVM

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Bill of Materials (BOM)

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TPD4S014. The TOP section has a switch to toggle the polarity of the EN signal. There are labels

indicating the HI and LO positions on the switch. There are also test points that can be used to determine

the logic level of EN and ACK signals. The TOP section also has an LED that indicates a fault condition.

Please note that the LED lights up when the ACK signal is at logic LO. The TOP section is intended to

illustrate the functionality of the device without any additional test equipment.

The BOTTOM section consists of the SMB connectors. The connectors are connected to VBUS, VCC, D+,

D– and ID pins. There is a test point for the ACK signal. The EN signal on the bottom section is tied to

ground i.e. the device is always enabled. The BOTTOM section is indented to be used to measure the

performance of the device such as ESD performance, Bandwidth and capacitance measurements, timing

characteristics etc.

Setup Procedure

1. Connect a 1.8V – 3.3V power supply between the Vin and GNC connectors of the board. The fault

indication LED should light up when this power is applied.

2. Connect a USB cable to the Input connector (left) of board. Connect a variable power supply to the

VBUS line on the other end of the cable. Set the Voltage on the power supply to <2V.

3. Connect another USB cable to the output connector (right) of the board. Connect a variable load to the

VBUS line on the other end of the cable. Set the load to >25 ohms.

4. Slowly increase the Voltage on the input. The LED should turn OFF when the Voltage crossed 3V.

5. Continue to increase the voltage past 6V. When the voltage crosses 6V the LED should turn ON again

indicating a fault (condition).

Bill of Materials (BOM)

Count RefDes

Value

Description

Size

Part Number

MFR

C2, C3, C4,

10uF

Capacitor, Ceramic, 10 µF, 6.3V, 10%

0805

Std

10uF

1kΩ

Capacitor, Ceramic, 10 µF, 6.3V, 10%

Resistor, Chip, 1 kΩ, 1/8W, 5%

0805

0603

Std

10kΩ

Resistor, Chip, 10 kΩ, 1/8W, 5%

Std

LED DOME 645NM RD DFF AXL LO CUR

2.08mm x 2.21mm (axial, Flat

lead)

HLMP-Q150

Avago

SPDT switch 12V , 100 mA, 70 mΩ

ON-resistance

8.85mm x 3mm

CSS-1210TB

5011

Copal Electronics

TP_C_ACK,

TP_B_ACK,

TP_C_EN

Test Point

Test Point 5011 Series

63 mil in diameter

Keystone Electronics

U1, U2

IC, 10-pin DSQ package

2mm x 2mm

TPD4S014

Texas Instruments

SMA1 to

SMA8

Sidemount SMB conn. For 0.062 board width

131-3701-801

Emerson Network Power

Connectivity Solutions

J1,J2

USB Right Angle Recpt. Type A

292303-1

Tyco electronics

TPD4S014 EVM

SLVU471–June 2011

Submit Documentation Feedback

www.ti.com

Schematics

Figure 1. Schematic (Page 1 of 2)

SLVU471–June 2011

TPD4S014 EVM

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Schematics

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Figure 2. Schematic (Page 2 of 2)

TPD4S014 EVM

SLVU471–June 2011

Submit Documentation Feedback

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TPD4S014EVM [TI]

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