Texas Instruments bq51221EVM-520 User Manual Download

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User's Guide

SLUUAX6B – February 2014 – Revised June 2014

Dual Mode (WPC and PMA) Integrated Wireless Receiver

Power Supply

The bq51221EVM-520 (PWR520-001) wireless power receiver evaluation kit (EVM) from Texas
Instruments is a high performance, easy-to-use development kit for the design of wireless power solutions.
It helps designers to evaluate the operation and performance of the bq51221 IC, (also, this EVM can be
used to evaluate the bq51021 IC, a WPC-only receiver) a secondary-side receiver device for wireless
power transfer in portable applications. The bq51221 device is a fully contained wireless power receiver
capable of operating in both the WPC and PMA protocols which enables a system to not be confined to
one standard. The bq51221 provides a single stage power conversion while integrating the digital control
and communication. The bq51221 complies with the WPC v1.1 and PMA communication protocol. The kit
enables designers to speed up the development of their end-applications.

Contents

Introduction

...................................................................................................................

Considerations with this EVM

..............................................................................................

Modifications

..................................................................................................................

Recommended Operation Condition

......................................................................................

Equipment and EVM Setup

.................................................................................................

5.1

Schematic

............................................................................................................

5.2

Connector and Test Point Descriptions

..........................................................................

5.3

Jumpers/Switches

..................................................................................................

5.4

Test Point Descriptions

............................................................................................

5.5

Pin Description of the IC

...........................................................................................

Test Procedure

...............................................................................................................

6.1

Definition

.............................................................................................................

6.2

Recommended Test Equipment

..................................................................................

6.3

Equipment Setup

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6.4

Procedure

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Test Results

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7.1

Steady State Operation with bq2425x Charger

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7.2

Load Step

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7.3

TS Control Function

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7.4

Efficiency Data

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7.5

AD Insertion and Removal

.......................................................................................

7.6

Thermal Performance

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Dual Mode Coil Design Consideration

...................................................................................

8.1

Shielding

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8.2

Receiver Detection: Attraction and Alignment

.................................................................

8.3

Inductor Value

.....................................................................................................

Layout and Bill of Materials

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9.1

bq5122x Traces

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9.2

Layout Guidelines

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9.3

Printed-Circuit Board Layout Example

.........................................................................

9.4

bq51221EVM-520 Layout

........................................................................................

9.5

Bill of Materials

....................................................................................................

List of Figures

SLUUAX6B – February 2014 – Revised June 2014

Dual Mode (WPC and PMA) Integrated Wireless Receiver Power Supply

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Summary of Contents for bq51221EVM-520

Page 1: ... the development of their end applications Contents 1 Introduction 3 2 Considerations with this EVM 3 3 Modifications 4 4 Recommended Operation Condition 4 5 Equipment and EVM Setup 5 5 1 Schematic 5 5 2 Connector and Test Point Descriptions 6 5 3 Jumpers Switches 6 5 4 Test Point Descriptions 7 5 5 Pin Description of the IC 7 6 Test Procedure 8 6 1 Definition 8 6 2 Recommended Test Equipment 8 6 ...

Page 2: ...Load 16 10 Dual Mode Coil Example 17 11 bq51221EVM 520 Layout Example 19 12 bq51221EVM 520 Top Assembly 20 13 bq51221EVM 520 Layer 1 20 14 bq51221EVM 520 Layer 2 21 15 bq51221EVM 520 Layer 3 21 16 bq51221EVM 520 Layer 4 22 List of Tables 1 bq51221EVM 520 Electrical Performance Specifications 4 2 Pin Description 7 3 bq51221EVM 520 Rev B Bill of Materials 23 2 Dual Mode WPC and PMA Integrated Wirele...

Page 3: ...aps between them to control the operation point Each PMA receiver will have a unique PMA RXID transmitted in the RXID message Note that the first build of these EVMs do not have RX ID implemented 2 Considerations with this EVM The bq51221EVM 520 evaluation module PWR520 001 demonstrates the receiver portion of the wireless power system This receiver EVM is a complete receiver side solution that pr...

Page 4: ...1221EVM 520 Electrical Performance Specifications Parameter Test Condition MIN TYP MAX Unit Vrect Rect voltage range 4 10 V IAD_EN_sink Sink current 1 mA IIN Input current range 1 5 A IOUT Output current range Current limit programming range 1 5 A VOUT REG Programmable Output Voltage 1 POUT 5 W 4 5 8 V Fs Switching Frequency WPC 110 205 kHz PMA 235 275 TJ Junction Temperature 125 C 1 The output vo...

Page 5: ...RB1 GND GND 0 1µF C18 150 R2 FOD TP5 1 2 3 JP1 110 R4 TP4 ADJ TS GND ILIM FIX RECT 56 2k R1 1 2 J3 1 2 J4 1 2 3 JP2 GND CM_ILIM High Low CM_ILIM GND GND 0 1µF C16 TP3 GND GND 0 1µF C6 OUT GND GND AD_EN Rect 1µF C17 GND GND GND Out ILIM FOD AC1 AC2 Orange D2 DNP Green D1 DNP 1 2 3 4 5 6 7 8 9 10 11 J1 1 2 3 4 5 6 7 8 9 10 J2 GND A2 A1 B2 C2 C1 B1 Q1 CSD75301W1015 500 Ohm R6 5k ohm R5 DNP OUT AD GND...

Page 6: ...turn J5 TS and Return Connector External connection for temperature sense resistor see the bq51221 data sheet SLUSBS9 for additional information Not populated in this spin 5 3 Jumpers Switches The control jumpers and switches are described in the following paragraphs JP1 ILIM Fix or ADJ Max output current is set by ILIM pin In the FIX position the current is set to a fixed value of R4 In the ADJ p...

Page 7: ...the IC TP5 FOD Input for rectified power measurement for Foreign Object Detection feature in WPC pin F2 of the IC FOD pin for the bq51221 5 5 Pin Description of the IC Table 2 Pin Description Pin Number WCSP bq5122x A1 A2 A3 A4 A5 A6 PGND B1 B2 B3 AC1 B4 B5 B6 AC2 C1 BOOT1 C2 C3 C4 C5 RECT C6 BOOT2 D1 D2 D3 D4 D5 D6 OUT E1 CLAMP1 E2 AD E3 AD_EN E4 SCL E5 VIREC E6 CLAMP2 F1 COMM1 F2 FOD F3 LPRB_EN ...

Page 8: ...lowing equipment is needed to complete this test procedure Power Supplies Power Supply 1 PS 1 capable of supplying 19 V at 1 A is required power plug to supply the PMA transmitter An adapter usually included on the PMA TX module Loads A resistive load or electronic load that can be set to 5 Ω 1000 mA 10 Ω 500 mA and 5 kΩ 1 mA power rating should be 5 W Meters Two DC voltmeters and two DC ammeters ...

Page 9: ...r power supply 19 V Transmitter Verify LED D2 is ON UUT Adjust load current to 1000 mA 50 mA Put the receiver EVM on the Transmitter coil and align them correctly After 5 seconds verify that Transmitter Status LED D5 should be green flashing 1 sec You should hear a beep from the transmitter Transmitter LED D2 still ON Receiver LED D1 is ON UUT Verify that Vout is 4 9 V to 5 1 V Between J3 and J4 U...

Page 10: ... ON UUT Verify that Vout is 4 9 V to 5 2 V Between J3 and J4 UUT Verify that rectified voltage should be 6 6 V to 8 6 V between TP3 and GND Note a modulation signal is present on this voltage every 250 ms and may cause fluctuation in the reading use lower value or base line 6 4 6 Efficiency Test 1 mA Load Verify that input current to TX is less than 80 mA with input voltage at 19 VDC Turn OFF Tran...

Page 11: ... with 18 V or with the PMA power adapter Connect the output of RX to a battery charger bq24250EVM 150 to charge a battery Set the VBAT to 3 8 V Set the charger current to 1 2 A Set input current limit from the charger to 1 A Monitor the IOUT and VOUT from the RX after putting the receiver EVM on the transmitter coil and align them correctly Figure 2 shows the VOUT and IOUT from the RX as the batte...

Page 12: ...o full charge state and connect system load to system output of the charger Then put the receiver EVM on the transmitter coil and align them correctly Provide a load step from no load high impedance to 1000 mA on the system load Monitor on side RX load current rectifier voltage and output voltage as shown in Figure 3 Figure 3 Load Step PMA with VIN_DPM 12 Dual Mode WPC and PMA Integrated Wireless ...

Page 13: ...ansmitter coil and align them correctly Provide a load step from no load high impedance 1000 mA if using current source load Monitor on side RX Rectifier voltage and output voltage as shown in Figure 4 Figure 4 Load Step WPC 13 SLUUAX6B February 2014 Revised June 2014 Dual Mode WPC and PMA Integrated Wireless Receiver Power Supply Submit Documentation Feedback Copyright 2014 Texas Instruments Inco...

Page 14: ...he transmitter coil and align them correctly Drive the TS pin high 2 V using external power supply Monitor the TS pin PMA signal If a test fixture is used to see End of Charge WPG and output voltage as shown in Figure 5 Figure 5 TS Control Function 14 Dual Mode WPC and PMA Integrated Wireless Receiver Power Supply SLUUAX6B February 2014 Revised June 2014 Submit Documentation Feedback Copyright 201...

Page 15: ...ransmitters Figure 6 System Efficiency versus Output Current 7 5 AD Insertion and Removal The plot shown in Figure 7 illustrates the behavior of the bq51221 when the AD is inserted while the EVM is on the transmitter pad There is a 36 ms off time during the transition between wireless power and wired power modes Figure 7 AD Insertion and Removal 15 SLUUAX6B February 2014 Revised June 2014 Dual Mod...

Page 16: ...The peak temperature of the IC 39 C in WPC and 37 C in PMA is well below the maximum recommended operating condition listed in the data sheet Figure 8 Thermal Image in WPC Transmitter 1000 mA Load Figure 9 Thermal Image in PMA Transmitter 1000 mA Load 16 Dual Mode WPC and PMA Integrated Wireless Receiver Power Supply SLUUAX6B February 2014 Revised June 2014 Submit Documentation Feedback Copyright ...

Page 17: ...t can trigger the Hall Effect Sensor and create enough interference on the digital pinging on the PMA transmitters The implementation is vendor specific and may rely on the magnetic material used for alignment aid the shielding or any other material designers select The alignment aid ferrite should have no more than 2 mm distance from charged device outer surface The recommended shielding ferrite ...

Page 18: ...ents The dissipation of heat path is important Adding internal layers increases the thermal performance Multiple vias in the PGND pulls of the IC is recommended to decrease the thermal resistance in the board and allow much easier thermal dissipation through inner layer and power ground layers The via interconnect is important and must be optimized near the power pad of the IC and the GND 2 oz cop...

Page 19: ...1 µF It is always good practice to place high frequency bypass capacitors next to RECT and OUT of 0 1 μF Figure 11 illustrates an example of a WCSP layout Figure 11 bq51221EVM 520 Layout Example 19 SLUUAX6B February 2014 Revised June 2014 Dual Mode WPC and PMA Integrated Wireless Receiver Power Supply Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 20: ...llustrate the bq51221EVM 520 layout views Figure 12 bq51221EVM 520 Top Assembly Figure 13 bq51221EVM 520 Layer 1 20 Dual Mode WPC and PMA Integrated Wireless Receiver Power Supply SLUUAX6B February 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 21: ...re 14 bq51221EVM 520 Layer 2 Figure 15 bq51221EVM 520 Layer 3 21 SLUUAX6B February 2014 Revised June 2014 Dual Mode WPC and PMA Integrated Wireless Receiver Power Supply Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 22: ...s www ti com Figure 16 bq51221EVM 520 Layer 4 22 Dual Mode WPC and PMA Integrated Wireless Receiver Power Supply SLUUAX6B February 2014 Revised June 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 23: ...12D Murata C21 1 2 2uF CAP CERM 2 2uF 16V 10 X5R 0603 603 GRM188R61C225KE15D Murata C22 0 100pF CAP CERM 100pF 50V 10 X7R 0402 402 CC0402KRX7R9BB101 Yageo America D3 1 Green LED Green SMD 1 6x0 8x0 8mm LTST C190GKT Lite On H1 1 Tape segment Low Static Polyimide Film Cut tape section from 36 1 5 x 2 3 5419 1 1 2 3M yard roll H2 1 Case Modified Polycase LP 11B with 4 screws J 6838A Polycase H3 1 Coi...

Page 24: ... 1W 0603 603 CRCW060327K0JNEA Vishay Dale SH JP1 SH JP2 2 1x2 Shunt 100mil Gold plated Black Shunt 969102 0000 DA 3M TP TP5 3 White Test Point TH Miniature White Keystone5002 5002 Keystone U1 1 DUAL MODE Qi and PMA INTEGRATED WIRELESS RECEIVER YFP0042AWCG bq51221YFP Texas Instruments POWER SUPPLY YFP0042AWCG D1 0 Green LED Green SMD 1 6x0 8x0 8mm LTST C190GKT Lite On D2 0 Orange LED Orange SMD 1 6...

Page 25: ...rch 2014 to B Revision Page Added information in the abstract including the bq51021 IC as a device that can be evaluated with this EVM 1 25 SLUUAX6B February 2014 Revised June 2014 Revision History Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 26: ...ndling 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 ...

Page 27: ...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 ...

Page 28: ...érieur au gain maximal indiqué sont strictement interdits pour l exploitation de l émetteur Mailing Address Texas Instruments Post Office Box 655303 Dallas Texas 75265 Copyright 2014 Texas Instruments Incorporated spacer Important Notice for Users of EVMs Considered Radio Frequency Products in Japan EVMs entering Japan are NOT certified by TI as conforming to Technical Regulations of Radio Law of ...

Page 29: ...esponsible for compliance with all legal regulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided by TI Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which anticipate dangerous consequences of failur...

Page 30: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments BQ51221EVM 520 ...

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