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TPS71401DRVEVM-426

器件型号:TPS71401DRVEVM-426
器件类别:嵌入式解决方案    工程工具    电源管理IC开发工具   
文件大小:1664.27KB,共10页
厂商名称:Texas Instruments
厂商官网:http://www.ti.com/
标准:  
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器件描述

Power Management IC Development Tools TPS71401DRVEVM-426 Eval Mod

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产品属性属性值
Product AttributeAttribute Value
制造商:
Manufacturer:
Texas Instruments
产品种类:
Product Category:
Power Management IC Development Tools
RoHS:N
产品:
Product:
Evaluation Boards
类型:
Type:
LDO Voltage Regulators
工具用于评估:
Tool Is For Evaluation Of:
TPS71401
Input Voltage:10 V
Output Voltage:3.3 V
Dimensions:38.1 mm x 30.5 mm
系列:
Series:
TPS714Â
商标:
Brand:
Texas Instruments
产品类型:
Product Type:
Power Management IC Development Tools
工厂包装数量:
Factory Pack Quantity:
1
子类别:
Subcategory:
Development Tools

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TPS71401DRVEVM-426器件文档内容

                                                                                       User's Guide

                                                                                              SBVU013 January 2009

                                                              TPS71401DRVEVM-426

This user's guide describes the characteristics, operation, and use of the TPS71401DRVEVM-426
evaluation module. This document includes setup instructions, a schematic diagram, thermal guidelines, a
bill of materials (BOM), and printed circuit board (PCB) layout drawings.

                                                                         Contents

1 Overview ...................................................................................................................... 1
2 Setup .......................................................................................................................... 2
3 Operation ..................................................................................................................... 3
4 Thermal Guidelines.......................................................................................................... 3
5 Board Layout, Schematic, and Parts List................................................................................. 4

                                                                     List of Figures

1 Assembly Layer .............................................................................................................. 5
2 Top Layer Routing ........................................................................................................... 6
3 Bottom Layer Assembly..................................................................................................... 7
4 Bottom Layer Routing ....................................................................................................... 8
5 TPS71401DRVEVM-426 Schematic ...................................................................................... 9

1 Overview

         This document describes the characteristics, operation, and use of the TPS71401DRVEVM-426
         evaluation module (EVM). This EVM demonstrates the capabilities and features of Texas Instruments'
         TPS71401, a low-dropout (LDO) linear regulator, an 80-mA, low quiescent current linear regulator in a
         2-mm x 2-mm SON package. The TPS71401DRVEVM-426 EVM helps designers evaluate the operation
         and performance of the TPS71401 LDO in a variety of configurations.

1.1 Related Documentation from Texas Instruments

         The following related documents are available through the Texas Instruments web site at
         http://www.ti.com.

Table 1. Related Documentation

Part Number                                                   Literature Number
TPS71401                                                           SBVS116

All trademarks are the property of their respective owners.                     TPS71401DRVEVM-426             1

SBVU013 January 2009
Submit Documentation Feedback
Setup                                                                                 www.ti.com

2 Setup

   This section describes the jumpers and connectors on the EVM as well as how to properly connect, set
   up, and use the TPS71401EVM.

2.1 Electrostatic Discharge Notice

                                                       CAUTION

         Many of the components on the TPS71401EVM are susceptible to damage by
         electrostatic discharge (ESD). Customers are advised to observe proper ESD
         handling precautions when unpacking and handling the EVM, including the use
         of a grounded wrist strap at an approved ESD workstation.

         Failure to observe proper ESD handling procedures may result in damage to
         EVM components.

2.2 Input/Output Connector Descriptions

2.2.1 J1: VIN

         This connector is the positive input supply voltage. The leads to the input supply should be twisted and
         kept as short as possible to minimize electromagnetic interference (EMI) transmission. Additional bulk
         capacitance should be added between J1 and J2 if the supply leads are longer than 6 in (15,24 cm). An
         additional 47uF or greater capacitor improves the transient response of the TPS71401 and helps to
         reduce ringing on the input when long supply wires are used.

2.2.2 J2: VOUT
         This point is the positive connection from the output. Connect this pin to the positive input of the load.

2.2.3 J3: GND
         This is the return connection for the input power supply of the regulator.

2.2.4 J4: GND
         This point is the return connection for the output.

2.2.5 J5: Output Voltage Selection

         This jumper is used to select the output voltage of the TPS71401. The jumper selects different feedback
         resistors to change the output voltage setting. The output voltage is set by inserting a shorting jumper
         across two pins of J5. The preprogrammed output voltages are configured as shown in Table 2.

                                    Table 2. Output Voltage Setting

                       Output Voltage (V)                     Jumper Between Pins
                                  5.0                                   1 and 2
                                  3.3                                   3 and 4
                                  2.7                                   5 and 6
                                  2.5                                   7 and 8

2  TPS71401DRVEVM-426                                                                          SBVU013 January 2009
                                                                                     Submit Documentation Feedback
www.ti.com                                                              Operation

Other output voltages can be configured by changing the feedback resistors on the board. The feedback
network is high impedance and sensitive to noise or resistance value changes. The pins of J5 should not
be touched while the device is powered on because the impedance of a human is enough to alter the
output voltage set point. The output voltage may increase or decrease if J5 is touched, which may
damage any load connected to the EVM.

3 Operation

         This section discusses the operation of the TPS71401EVM.

3.1 Power On

         Connect the positive input power supply to J1. Connect the input power return (ground) to J3. The
         TPS71401EVM has an absolute maximum input voltage of 11.0 V. The recommended maximum operating
         voltage is 10 V. The actual highest input voltage may be less than 10 V as a result of thermal conditions.
         See the Thermal Considerations section of this manual to determine the highest input voltage.

         Connect the desired load between J2 (positive lead) and J4 (negative or return lead). Configure jumper J5
         for the desired output voltage. The function of J5 is described in the Setup section of this manual.

3.2 Fixed Output TPS714xx Device Configuration

         The TPS71401 EVM can also be used to evaluate fixed-output voltage versions of the TPS714 LDO. The
         board layout and device footprints are the same for both the adjustable and the fixed-output voltage
         versions of the TPS714. To evaluate a fixed-output voltage version, the IC on the board must be changed
         to the desired fixed output voltage (TPS714xx). Note that R1 must be removed from the EVM board if a
         fixed output voltage version is mounted to the EVM board.

4 Thermal Guidelines
         This section presents guidelines for the thermal management of the TPS71401DRVEVM-426 PCB.

4.1 Thermal Considerations

Thermal management is a key design component of any power converter application and is especially

important when the power dissipation in the LDO is high. To better help users design the TPS71401 family

into an application, the following formula should be used to approximate the maximum power dissipation

at a particular ambient temperature:

            T =T +P q                                                                               (1)
            J  A  D            JA

       Where:
                TJ is the junction temperature
                TA is the ambient temperature
                PD is the power dissipation in the IC
                JA is the thermal resistance from junction to ambient

All temperatures are in degrees Celsius.

The thermal resistance from junction to ambient for the TPS71401EVM has a typical value of 65C/W. The
recommended maximum operating junction temperature specified in the data sheet for the TPS71401

family is +125C. With these two pieces of information, the maximum power dissipation can be found by
using Equation 1.

SBVU013 January 2009                                                  TPS71401DRVEVM-426               3
Submit Documentation Feedback
Board Layout, Schematic, and Parts List                                       www.ti.com
         Example 1. Maximum Power Dissipation Calculation

   What is the maximum input voltage that can be applied to a TPS71401 with the output voltage
   configured to 3.3 V if the ambient temperature is +85C and the full 80 mA of load current is required?

   Given:

   TJ = +125C, TA = +85C, JA = 65C/W

   Using Equation 1, we substitute in the given values above and find that the maximum power dissipation

   for the part is PD = 0.615 W.

   +125C = +85C + PD(65C/W)                                                                                      (2)

   This result means that the total power dissipation of the TPS71401 must be less than 0.615 W. Now the

   input voltage can be calculated:

   PD = (VIN - VOUT) IOUT = (VIN - 3.3 V) 0.08 A = 0.615 W                                                      (3)

   Therefore, the maximum input voltage should be 10.98 V or less in order to maintain a safe junction
   temperature. However, the recommended maximum input voltage is 10.0 V, so the device can be used
   over the entire recommended input voltage range.

   Similar analyses can be performed to determine the maximum ambient temperature allowed and still
   provide the full output current while maintaining the junction temperature at or below +125C. The
   maximum ambient temperature depends on the output voltage. Table 3 lists the maximum ambient

   temperature allowed for the pre-programmed output voltages.

                       Table 3. Output Voltage and Maximum Ambient
                                               Temperature

                                  Output Voltage (V)       Maximum Ambient
                                             5.0            Temperature (C)
                                             3.3
                                             2.7                      99
                                             2.5                      90
                                                                      87
                                                                      86

5 Board Layout, Schematic, and Parts List
         This section provides the TPS71401DRVEVM-426 board layout and illustrations. It also includes the
         schematic and bill of materials for the EVM.

5.1 PCB Layouts
         Figure 1 through Figure 3 show the layout for the TPS71401DRVEVM-426 PCB.

               Note: Board layouts are not to scale. These figures are intended to show how the board is laid out;
                           they are not intended to be used for manufacturing TPS71401DRVEVM-426 PCBs.

4  TPS71401DRVEVM-426                                                                   SBVU013 January 2009
                                                                              Submit Documentation Feedback
www.ti.com                                               Board Layout, Schematic, and Parts List

                               Figure 1. Assembly Layer

SBVU013 January 2009                                   TPS71401DRVEVM-426  5
Submit Documentation Feedback
Board Layout, Schematic, and Parts List                               www.ti.com

                                         Figure 2. Top Layer Routing

6  TPS71401DRVEVM-426                                                           SBVU013 January 2009
                                                                      Submit Documentation Feedback
www.ti.com                                                      Board Layout, Schematic, and Parts List

                               Figure 3. Bottom Layer Assembly

SBVU013 January 2009                                          TPS71401DRVEVM-426  7
Submit Documentation Feedback
Board Layout, Schematic, and Parts List                                  www.ti.com

                                         Figure 4. Bottom Layer Routing

8  TPS71401DRVEVM-426                                                              SBVU013 January 2009
                                                                         Submit Documentation Feedback
www.ti.com                     Board Layout, Schematic, and Parts List

5.2 Schematic and BOM

Figure 5 illustrates the TPS71401DRVEVM-426 schematic. Table 4 lists the bill of materials for this EVM.

                               Figure 5. TPS71401DRVEVM-426 Schematic

SBVU013 January 2009                                                 TPS71401DRVEVM-426                 9
Submit Documentation Feedback
Board Layout, Schematic, and Parts List                                                                                  www.ti.com

                        Table 4. TPS71401DRVEVM-426 Bill of Materials(1)(2)(3)

    Count  RefDes (4)   Value                Description               Size       Part Number                              Mfr
       1                                                                                                                  Any
           C1           0.1 F           Capacitor, Ceramic, 0.1-F,   603        STD
       1                                                                                                                  Any
                                         16-V, X7R, 10%
       4                                                                                                                 Sullins
           C2           2.2 F           Capacitor, Ceramic, 2.2-F,   603        STD
       1                                                                                                                 Sullins
                                         10-V, X7R, 10%
       1                                                                                                                  Any
           J1, J2,      PTC36SAAN Header, Two-pin, 100-mil             0.100 x 2  PTC36SAAN
       1   J3, J4                             spacing                                                                     Any

       1   J5           PTC36DAAN Header, Male 2x4-pin,                0.20 x 0.40 in PTC36DAAN                           Any
       1                                                                                                                  Any
       1                                 100-mil spacing                                                                  Any
       1                                                                                                                  Any
       1   N/A          N/A              PCB, 1.5 In x 1.2 In x 0.062  --         HPA425                                    TI

       1                                 In                                                                                3M

           R1           487 k            Resistor, Chip, 1.00M,        603        STD

                                         1/16-W, 1%

           R2           154 k            Resistor, Chip, 1/16W, 5%     603        STD

           R3           280 k            Resistor, Chip, 1/16W, 5%     603        STD

           R4           392 k            Resistor, Chip, 1/16W, 5%     603        STD

           R5           453 k            Resistor, Chip, 1/16W, 5%     603        STD

           U1           TPS71401DRV IC, 80-mA, 10-V Quiescent 2mm x 2mm TPS71401DRV

                                         Current 3.2-A LDO Linear

                                         Regulator

           --           --               100-mm Two-Pin Shunt          0.100 x 2  929957-08

    (1) These assemblies are ESD sensitive. ESD precautions shall be observed.
    (2) These assemblies must be clean and free from flux and all contaminants. Use of no-clean flux is not acceptable.
    (3) These assemblies must comply with workmanship standards IPC-A-610 Class 2.
    (4) Components can be substituted with equivalent manufacturer components.

10  TPS71401DRVEVM-426                                                                      SBVU013 January 2009
                                                                                  Submit Documentation Feedback
                                         EVALUATION BOARD/KIT IMPORTANT NOTICE

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:

This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES
ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have
electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental
measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation board/kit does
not fall within the scope of the European Union directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling
(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.

Should this evaluation board/kit not meet the specifications indicated in the User's Guide, the board/kit may be returned within 30 days from
the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER
AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user's responsibility to take any and all
appropriate precautions with regard to electrostatic discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY
INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.

TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or
services described herein.

Please read the User's Guide and, specifically, the Warnings and Restrictions notice in the User's Guide prior to handling the product. This
notice contains important safety information about temperatures and voltages. For additional information on TI's environmental and/or
safety programs, please contact the TI application engineer or visit www.ti.com/esh.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any machine, process, or
combination in which such TI products or services might be or are used.

                                                                 FCC Warning

This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES
ONLY and is not considered by TI to be a finished end-product fit for general consumer use. It generates, uses, and can radiate radio
frequency energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC rules, which are
designed to provide reasonable protection against radio frequency interference. Operation of this equipment in other environments may
cause interference with radio communications, in which case the user at his own expense will be required to take whatever measures may
be required to correct this interference.

                                               EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 2.5 V to 10 V and the output voltage range of 1.2 V to 8.8 V.

Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions
concerning the input range, please contact a TI field representative prior to connecting the input power.

Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.
Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.

During normal operation, some circuit components may have case temperatures greater than +85C. The EVM is designed to operate
properly with certain components above +85C as long as the input and output ranges are maintained. These components include but are
not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified
using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation,
please be aware that these devices may be very warm to the touch.

                                      Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
                                                            Copyright 2009, Texas Instruments Incorporated
                                                     IMPORTANT NOTICE

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TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI's standard
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TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and
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