User's Guide
SLVUA23 – April 2014
TPS62684EVM-647 Evaluation Module
This user’s guide describes the characteristics, operation, and use of the TPS62684EVM-647 (PWR647001) evaluation module (EVM). The TPS62684EVM-647 is a fully assembled and tested platform for
evaluating the performance of the TPS62684 high-frequency, synchronous, step-down dc-dc converter
optimized for battery-powered portable applications. This document includes a schematic diagram, a
printed circuit board (PCB) layout, and a bill of materials.
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2
3
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5
6
Contents
Introduction ...................................................................................................................
1.1
Features ..............................................................................................................
1.2
Applications ..........................................................................................................
TPS62684EVM-647 Schematic ............................................................................................
Connector Descriptions .....................................................................................................
3.1
Input/Output Connectors: TPS62684EVM-647 .................................................................
3.2
Jumpers .............................................................................................................
TPS62684EVM-647 Test Data .............................................................................................
4.1
Thermal Performance ..............................................................................................
4.2
Loop Response .....................................................................................................
TPS62684EVM-647 Board Layout ........................................................................................
TPS62684EVM-647 Bill of Material .......................................................................................
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2
2
2
3
3
3
4
4
4
5
8
List of Figures
1
TPS62684EVM-647 Schematic ............................................................................................ 2
2
Thermal Performance for the TPS62684 (VIN = 5.5 V, Load = 1600 mA) ........................................... 4
3
Loop Response for the TPS62684 (VIN = 5 V, Load = 1600 mA) .................................................... 4
4
TPS62684EVM-647 Top Silkscreen (Top View) ......................................................................... 5
5
TPS62684EVM-647 Top Copper (Top View) ............................................................................ 5
6
TPS62684EVM-647 Layer 2 Copper ...................................................................................... 6
7
TPS62684EVM-647 Layer Copper ........................................................................................ 6
8
TPS62684EVM-647 Bottom Copper (Bottom View)
....................................................................
7
List of Tables
1
Bill of Material for the TPS62684EVM-647 ............................................................................... 8
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1
Introduction
1
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Introduction
The TPS62684 device is a high-frequency, synchronous, step-down dc-dc converter optimized for batterypowered portable applications. Intended for low-power applications, the TPS62684 supports up to 1600mA of load current and allows the use of low-cost chip inductors and capacitors. The TPS62684 operates
at a regulated 5.5-MHz switching frequency with spread spectrum dithering.
1.1
Features
•
•
•
•
•
•
•
1.2
Input voltage range 3.25 V to 5.5 V
1600 mA Output Current
2.85V Fixed output voltage
Best in class load and line transient
Spread spectrum, PWM frequency dithering
Total solution size of less than 12 mm2
Active Output Discharge
Applications
•
•
•
2
Cell phones, smartphones
Tablet PC
Digital TV, WLAN, GPS, and Bluetooth
TPS62684EVM-647 Schematic
1
2
Vin
3.25 V - 5.5 V
VBAT
VOUT
J1
U1
A2
1
2
S+
S-
A1
J2
C8
150 µF
C1
1.5 µF
C7
1
2
GND
1
B2
R1
1.00Meg
J3
VIN
SW
AVIN
FB
EN
1
2
GND
B1 SW
C1
VOUT
2.85 V at 1.6 A Max
J4
L1
1
2
MDT2012-CRR56N
S+
SJ5
C2
10 µF
C2
TPS62684YFF
C3
C4
C5
C6
1
1
1
1
1
2
GND
J6
GND
GND
1
2
3
ON
EN
OFF
GND
GND
GND
GND
1
GND
Not Installed
EN
JP1
GND
Figure 1. TPS62684EVM-647 Schematic
2
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Connector Descriptions
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3
Connector Descriptions
3.1
Input/Output Connectors: TPS62684EVM-647
3.1.1
J1 – VIN
This header is the positive connection to the input power supply. The power supply must be connected
between J1 (VIN) and J3 (GND). The leads to the input supply must be twisted and kept as short as
possible. The input voltage must be between 3.25 V and 5.5 V.
3.1.2
J2 – S+/S–
J2 S+/S– are the sense connections for the input of the converter. Connect a voltmeter, sense connection
of a power supply, or oscilloscope to this header.
3.1.3
J3 – GND
This header is the return connection to the input power supply. Connect the power supply between J3
(GND) and J1 (VIN). The leads to the input supply must be twisted and kept as short as possible.
3.1.4
J4 – VOUT
This header is the positive output of the step-down converter. A load can be connected between J6 (GND)
and J4 (VOUT).
3.1.5
J5 – S+/SJ5 S+/S– are the sense connections for the output of the converter. Connect a voltmeter, sense
connection of an electronic load, or oscilloscope to this header.
3.1.6
J6 – GND
J8 is the return connection of the converter. A load can be connected between J4 (VOUT) and J6 (GND).
3.2
3.2.1
Jumpers
JP1 – ENABLE
This jumper enables/disables the converter on the EVM. Placing a shorting jumper between EN and ON
turns on the converter. Placing a shorting jumper between EN and OFF disables the converter.
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TPS62684EVM-647 Test Data
4
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TPS62684EVM-647 Test Data
The TPS62684EVM-647 was used to take the data in the TPS62684 data sheet, SLVSAC5. See the
device data sheet for the performance of this EVM.
4.1
Thermal Performance
Figure 2 shows the typical thermal performance of the TPS62684EVM-647.
Figure 2. Thermal Performance for the TPS62684 (VIN = 5.5 V, Load = 1600 mA)
4.2
Loop Response
60
180
50
150
40
120
30
90
20
60
10
30
0
0
-10
-30
-20
-60
-30
-90
-40
-120
Gain
-50
-150
Phase
-60
1000
Phase (deg)
Gain (dB)
Figure 3 shows the bode plot of the TPS62684EVM-647.
10000
100000
-180
1000000
Frequency (Hz)
C001
Figure 3. Loop Response for the TPS62684 (VIN = 5 V, Load = 1600 mA)
4
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TPS62684EVM-647 Board Layout
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5
TPS62684EVM-647 Board Layout
Figure 4 through Figure 8 show the design of the TPS62684EVM-647 printed-circuit boards (PCBs). The
gerbers are available on the EVM product page: TPS62684EVM-647.
Figure 4. TPS62684EVM-647 Top Silkscreen (Top View)
Figure 5. TPS62684EVM-647 Top Copper (Top View)
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TPS62684EVM-647 Board Layout
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Figure 6. TPS62684EVM-647 Layer 2 Copper
Figure 7. TPS62684EVM-647 Layer Copper
6
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TPS62684EVM-647 Board Layout
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Figure 8. TPS62684EVM-647 Bottom Copper (Bottom View)
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TPS62684EVM-647 Bill of Material
6
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TPS62684EVM-647 Bill of Material
Table 1 lists the bill of materials for the TPS62684EVM-647.
Table 1. Bill of Material for the TPS62684EVM-647
TPS62684EVM-647
(PWR647-001)
Qty
8
RefDes
Value
Size
Description
Part Number
Manufacturer
1
C1
150 µF
3528
Capacitor, Tantalum Poly, 6.3 V, 70 mΩ, 20%
T520B157M006ATE070
Kemet
1
C2
1.5 µF
0402
Capacitor, Ceramic, 6.3 V, X5R, 20%
GRM155R60J155ME80
Murata
1
C3
10 µF
0603
Capacitor, Ceramic, 6.3 V, X5R, 20%
GRM188R60J106ME84
Murata
1
L1
0.56 µH
0805
Inductor, SMT, 2.35 A, 65 mΩ
MDT2012-CRR056N
Toko
1
U1
TPS62684
1.431 mm x 1.135
mm
IC, 2.85-V, 1600-mA, Synchronous Step-Down
Converter
TPS62684YFF
TI
TPS62684EVM-647 Evaluation Module
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ADDITIONAL TERMS AND CONDITIONS, WARNINGS, RESTRICTIONS, AND DISCLAIMERS FOR
EVALUATION MODULES
Texas Instruments Incorporated (TI) markets, sells, and loans all evaluation boards, kits, and/or modules (EVMs) pursuant to, and user
expressly acknowledges, represents, and agrees, and takes sole responsibility and risk with respect to, the following:
1.
User agrees and acknowledges that EVMs are intended to be handled and used for feasibility evaluation only in laboratory and/or
development environments. Notwithstanding the foregoing, in certain instances, TI makes certain EVMs available to users that do not
handle and use EVMs solely for feasibility evaluation only in laboratory and/or development environments, but may use EVMs in a
hobbyist environment. All EVMs made available to hobbyist users are FCC certified, as applicable. Hobbyist users acknowledge, agree,
and shall comply with all applicable terms, conditions, warnings, and restrictions in this document and are subject to the disclaimer and
indemnity provisions included in this document.
2. Unless otherwise indicated, EVMs are not finished products and not intended for consumer use. EVMs are intended solely for use by
technically qualified electronics experts who are familiar with the dangers and application risks associated with handling electrical
mechanical components, systems, and subsystems.
3. User agrees that EVMs shall not be used as, or incorporated into, all or any part of a finished product.
4. User agrees and acknowledges that certain EVMs may not be designed or manufactured by TI.
5. User must read the user's guide and all other documentation accompanying EVMs, including without limitation any warning or
restriction notices, prior to handling and/or using EVMs. Such notices contain important safety information related to, for example,
temperatures and voltages. For additional information on TI's environmental and/or safety programs, please visit www.ti.com/esh or
contact TI.
6. User assumes all responsibility, obligation, and any corresponding liability for proper and safe handling and use of EVMs.
7. Should any EVM not meet the specifications indicated in the user’s guide or other documentation accompanying such EVM, the EVM
may be returned to TI within 30 days from the date of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS THE
EXCLUSIVE WARRANTY MADE BY TI TO USER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR
STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. TI SHALL
NOT BE LIABLE TO USER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES RELATED TO THE
HANDLING OR USE OF ANY EVM.
8. 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 EVMs might be or are used. TI currently deals with a variety of customers, and therefore TI’s 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 with respect to the handling or use of EVMs.
9. User assumes sole responsibility to determine whether EVMs may be subject to any applicable federal, state, or local laws and
regulatory requirements (including but not limited to U.S. Food and Drug Administration regulations, if applicable) related to its handling
and use of EVMs and, if applicable, compliance in all respects with such laws and regulations.
10. User has sole responsibility to ensure the safety of any activities to be conducted by it and its employees, affiliates, contractors or
designees, with respect to handling and using EVMs. Further, user is responsible to ensure that any interfaces (electronic and/or
mechanical) between EVMs and any human body are designed with suitable isolation and means to safely limit accessible leakage
currents to minimize the risk of electrical shock hazard.
11. User shall employ reasonable safeguards to ensure that user’s use of EVMs will not result in any property damage, injury or death,
even if EVMs should fail to perform as described or expected.
12. User shall be solely responsible for proper disposal and recycling of EVMs consistent with all applicable federal, state, and local
requirements.
Certain Instructions. User shall operate EVMs within TI’s recommended specifications and environmental considerations per the user’s
guide, accompanying documentation, and any other applicable requirements. Exceeding the specified ratings (including but not limited to
input and output voltage, current, power, and environmental ranges) for EVMs may cause property damage, personal injury or death. If
there are questions concerning these ratings, user should contact a TI field representative prior to connecting interface electronics including
input power and intended loads. Any loads applied outside of the specified output range may result in unintended and/or inaccurate
operation and/or possible permanent damage to the EVM and/or interface electronics. Please consult the applicable 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 60°C as long as the input and output are maintained
at a normal ambient operating temperature. These components include but are not limited to linear regulators, switching transistors, pass
transistors, and current sense resistors which can be identified using EVMs’ schematics located in the applicable EVM user's guide. When
placing measurement probes near EVMs during normal operation, please be aware that EVMs may become very warm. As with all
electronic evaluation tools, only qualified personnel knowledgeable in electronic measurement and diagnostics normally found in
development environments should use EVMs.
Agreement to Defend, Indemnify and Hold Harmless. User agrees to defend, indemnify, and hold TI, its directors, officers, employees,
agents, representatives, affiliates, licensors and their representatives harmless from and against any and all claims, damages, losses,
expenses, costs and liabilities (collectively, "Claims") arising out of, or in connection with, any handling and/or use of EVMs. User’s
indemnity shall apply whether Claims arise under law of tort or contract or any other legal theory, and even if EVMs fail to perform as
described or expected.
Safety-Critical or Life-Critical Applications. If user intends to use EVMs in evaluations of safety critical applications (such as life support),
and a failure of a TI product considered for purchase by user for use in user’s product would reasonably be expected to cause severe
personal injury or death such as devices which are classified as FDA Class III or similar classification, then user must specifically notify TI
of such intent and enter into a separate Assurance and Indemnity Agreement.
RADIO FREQUENCY REGULATORY COMPLIANCE INFORMATION FOR EVALUATION MODULES
Texas Instruments Incorporated (TI) evaluation boards, kits, and/or modules (EVMs) and/or accompanying hardware that is marketed, sold,
or loaned to users may or may not be subject to radio frequency regulations in specific countries.
General Statement for EVMs Not Including a Radio
For EVMs not including a radio and not subject to the U.S. Federal Communications Commission (FCC) or Industry Canada (IC)
regulations, TI intends EVMs to be used only for engineering development, demonstration, or evaluation purposes. EVMs are not finished
products typically fit for general consumer use. EVMs may nonetheless generate, use, or radiate radio frequency energy, but have not been
tested for compliance with the limits of computing devices pursuant to part 15 of FCC or the ICES-003 rules. Operation of such EVMs 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.
General Statement for EVMs including a radio
User Power/Frequency Use Obligations: For EVMs including a radio, the radio included in such EVMs is intended for development and/or
professional use only in legally allocated frequency and power limits. Any use of radio frequencies and/or power availability in such EVMs
and their development application(s) must comply with local laws governing radio spectrum allocation and power limits for such EVMs. It is
the user’s sole responsibility to only operate this radio in legally acceptable frequency space and within legally mandated power limitations.
Any exceptions to this are strictly prohibited and unauthorized by TI unless user has obtained appropriate experimental and/or development
licenses from local regulatory authorities, which is the sole responsibility of the user, including its acceptable authorization.
U.S. Federal Communications Commission Compliance
For EVMs Annotated as FCC – FEDERAL COMMUNICATIONS COMMISSION Part 15 Compliant
Caution
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Changes or modifications could void the user's authority to operate the equipment.
FCC Interference Statement for Class A EVM devices
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the
instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will be required to correct the interference at its own expense.
FCC Interference Statement for Class B EVM devices
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and
on, the user is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Industry Canada Compliance (English)
For EVMs Annotated as IC – INDUSTRY CANADA Compliant:
This Class A or B digital apparatus complies with Canadian ICES-003.
Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the
equipment.
Concerning EVMs Including Radio Transmitters
This device complies with Industry Canada licence-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this
device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired
operation of the device.
Concerning EVMs Including Detachable Antennas
Under Industry Canada regulations, this radio transmitter may only operate using an antenna of a type and maximum (or lesser) gain
approved for the transmitter by Industry Canada. To reduce potential radio interference to other users, the antenna type and its gain should
be so chosen that the equivalent isotropically radiated power (e.i.r.p.) is not more than that necessary for successful communication.
This radio transmitter has been approved by Industry Canada to operate with the antenna types listed in the user guide with the maximum
permissible gain and required antenna impedance for each antenna type indicated. Antenna types not included in this list, having a gain
greater than the maximum gain indicated for that type, are strictly prohibited for use with this device.
Canada Industry Canada Compliance (French)
Cet appareil numérique de la classe A ou B est conforme à la norme NMB-003 du Canada
Les changements ou les modifications pas expressément approuvés par la partie responsable de la conformité ont pu vider l’autorité de
l'utilisateur pour actionner l'équipement.
Concernant les EVMs avec appareils radio
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est
autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout
brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
Concernant les EVMs avec antennes détachables
Conformément à la réglementation d'Industrie Canada, le présent émetteur radio peut fonctionner avec une antenne d'un type et d'un gain
maximal (ou inférieur) approuvé pour l'émetteur par Industrie Canada. Dans le but de réduire les risques de brouillage radioélectrique à
l'intention des autres utilisateurs, il faut choisir le type d'antenne et son gain de sorte que la puissance isotrope rayonnée équivalente
(p.i.r.e.) ne dépasse pas l'intensité nécessaire à l'établissement d'une communication satisfaisante.
Le présent émetteur radio a été approuvé par Industrie Canada pour fonctionner avec les types d'antenne énumérés dans le manuel
d’usage et ayant un gain admissible maximal et l'impédance requise pour chaque type d'antenne. Les types d'antenne non inclus dans
cette liste, ou dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur.
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EVMs entering Japan are NOT certified by TI as conforming to Technical Regulations of Radio Law of Japan.
If user uses EVMs in Japan, user is required by Radio Law of Japan to follow the instructions below with respect to EVMs:
1.
2.
3.
Use EVMs in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and
Communications on March 28, 2006, based on Sub-section 1.1 of Article 6 of the Ministry’s Rule for Enforcement of Radio Law of
Japan,
Use EVMs only after user obtains the license of Test Radio Station as provided in Radio Law of Japan with respect to EVMs, or
Use of EVMs only after user obtains the Technical Regulations Conformity Certification as provided in Radio Law of Japan with respect
to EVMs. Also, do not transfer EVMs, unless user gives the same notice above to the transferee. Please note that if user does not
follow the instructions above, user will be subject to penalties of Radio Law of Japan.
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