Texas Instruments bq51020EVM User Manual Download

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User's Guide

SLUUB03 – April 2014

bq51020EVM (5-W WPC) Integrated Wireless Receiver

Power Supply

The bq51020EVM-520 (PWR520-002) wireless power receiver evaluation kit (EVM) from TI 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 bq51020 IC, a secondary-side receiver device for wireless
power transfer in portable applications. The bq51020 device is a fully-contained, wireless power receiver
capable of operating in WPC v1.1 protocol which allows a wireless power system to deliver up to 5 W to
the system when used with a Qi inductive transmitter. The bq51020 device provides a single device power
conversion (rectification and regulation) as well as the digital control and communication for WPC
specification. The kit enables designers to speed up the development of their end-applications.

Contents

Introduction

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Considerations with this EVM

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Modifications

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Recommended Operation Condition

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Equipment and EVM Setup

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5.1

Schematic

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5.2

Connector Descriptions

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5.3

Jumpers and Switches

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5.4

Test Point Descriptions

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5.5

Pin Description of the IC

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Test Procedure

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6.1

Definition

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6.2

Recommended Test Equipment

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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

Start Up

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7.4

Efficiency Data

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7.5

AD Insertion and Removal

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7.6

Thermal Performance

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Layout and Bill of Material

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8.1

bq51020 Traces

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8.2

Layout Guidelines

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8.3

Printed-Circuit Board Layout Example

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8.4

bq51020EVM-520 Layout

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8.5

Bill of Materials (BOM)

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List of Figures

bq51020EVM-520 Schematic

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bq51020 in Steady State Operation with bq24250

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Load Step

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Start Up With 500 mA

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System Efficiency Versus Output Power

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SLUUB03 – April 2014

bq51020EVM (5-W WPC) Integrated Wireless Receiver Power Supply

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Summary of Contents for bq51020EVM

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

Page 2: ...ransfer process A WPC system communication is digital packets are transferred from the secondary to the primary Differential bi phase encoding is used for the packets The bit rate is 2Kbps Various types of communication packets have been defined These include identification and authentication packets error packets control packets power usage packets and efficiency packets among others 2 Considerat...

Page 3: ...pace Note that changing components can improve or degrade EVM performance 4 Recommended Operation Condition Table 1 provides a summary of the bq51020EVM 520 performance specifications All specifications are given for an ambient temperature of 25 C Table 1 bq51020EVM 520 Electrical Performance Specifications PARAMETER TEST CONDITION MIN TYP MAX UNIT VIN RECT input voltage range 4 0 10 0 V IAD_EN_si...

Page 4: ...C13 3 3µF C7 1 50k R20 DNP Green D3 DNP GND 102k R17 DNP 102k R14 11 3k R18 DNP 11 3k R10 102k R19 DNP 5 6Meg R12 27k R21 DNP 100pF C22 DNP GND PGND A1 PGND A2 PGND A3 PGND A4 PGND A5 PGND A6 AC1 B1 AC1 B2 AC1 B3 AC2 B4 AC2 B5 AC2 B6 BOOT1 C1 RECT C2 RECT C3 RECT C4 RECT C5 BOOT2 C6 OUT D1 OUT D2 OUT D3 OUT D4 OUT D5 OUT D6 CLAMP1 E1 AD E2 AD_EN E3 EN1 SCL E4 VIREG E5 CLAMP2 E6 COMM1 F1 FOD F2 LPR...

Page 5: ...urrent is set by the ILIM pin In the FIX position the current is set to a fixed value of R4 plus RFOD In the ADJ position current is set by R5 Note that R5 is not populated in this EVM 5 3 2 JP2 CM_ILIM Enables CM_ILIM feature when pulled low and disable when pulled up 5 3 3 JP3 EN1 Low and High EN1 pin set High using external power supply connected to TP6 5 3 4 JP4 EN2 Low and High EN2 pin set Hi...

Page 6: ...umber WCSP bq51020 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 EN1 E5 VTSB E6 CLAMP2 F1 COMM1 F2 FOD F3 TERM F4 EN2 F5 WPG F6 COMM2 G1 VO_REG G2 ILIM G3 CM_ILIM G4 TS CTRL G5 TMEM G6 PD_DET 6 Test Procedure This procedure describes test configuration of the bq51020EVM 520 evaluation board PWR520 002 for bench...

Page 7: ...er Supply 3 PS 3 capable of supplying 5 V at 1 A is required 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 The power rating should be 5 W Meters Two DC voltmeters and two DC ammeters Oscilloscopes Not required bqTesla Transmitter The HPA689 transmitter or equivalent is used for the final test Recommended Wire Gauge For proper operation TI recomm...

Page 8: ... 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 approximately every 1 second The transmitter should beep Transmitter LED D2 still ON Receiver LED D1 is ON UUT Verify that VOUT is 4 9 V to 5 15 V between J3 and J4 UUT Verify that the rectified voltage is 5 V to 5 4 V b...

Page 9: ... may cause fluctuation in the reading use lower value or baseline Efficiency Test 1 mA Load Verify that input current to the TX is less than 80 mA with input voltage at 19 VDC Turn OFF the transmitter power supply 19 V Remove UUT from transmitter Adapter Test 500 mA Load Connect 5 V 250 mV adapter on J1 on the bq51020EVM 520 receiver Adjust the load current to 500 mA 50 mA J3 OUT and J4 GND Verify...

Page 10: ... JP4 EN2 and High are shorted 8 Put the receiver EVM on the transmitter coil and align them correctly while still having the adapter connected to J1 and the external 5 V on TP6 9 Verify that UUT LED D1 is OFF UUT VOUT is 0 V 600 mV J3 Transmitter Status LED D5 is ON This means both wired and wireless power are disabled 10 bq51020EVM 5 W WPC Integrated Wireless Receiver Power Supply SLUUB03 April 2...

Page 11: ...Set the VBAT to 3 8 V Set the charger current to 1 2 A Set input current limit on 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 battery charges Figure 2 bq51020 in Steady State Operation with bq24250 11 SLUUB03 April 2014 bq51020EVM 5 W WPC Integrated Wirel...

Page 12: ...nd output voltage as shown in Figure 3 Figure 3 Load Step 7 3 Start Up The procedure for start up test with load Set up the test bench as described in Section 6 Power the WPC TX Apply 10 Ω across J3 and J4 put the receiver EVM on the transmitter coil and align them correctly Monitor the RECT pin IOUT and output voltage as shown in Figure 4 12 bq51020EVM 5 W WPC Integrated Wireless Receiver Power S...

Page 13: ...020EVM 520 under different transmitters Figure 5 System Efficiency Versus Output Power 7 5 AD Insertion and Removal Figure 6 illustrates the behavior of the bq51020EVM 520 when the AD is inserted while the EVM is on the transmitter pad There is some off time during the transition between wireless power and wired power modes 13 SLUUB03 April 2014 bq51020EVM 5 W WPC Integrated Wireless Receiver Powe...

Page 14: ...et to 5 V There is no air flow and the ambient temperature is 25 C The peak temperature of the device 39 C in WPC is well below the maximum recommended operating condition listed in the data sheet Figure 7 Thermal Image 1000 mA Load 14 bq51020EVM 5 W WPC Integrated Wireless Receiver Power Supply SLUUB03 April 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 15: ...mall signal components The dissipation of heat path is important Adding internal layers increases the thermal performance Multiple vias in the PGND pins 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...

Page 16: ... RECT 10 μF OUT 1 μF It is always good practice to place high frequency bypass capacitors next to RECT and OUT of 0 1 μF Figure 8 illustrates an example of a WCSP layout Figure 8 bq51020EVM 520 Layout Example 16 bq51020EVM 5 W WPC Integrated Wireless Receiver Power Supply SLUUB03 April 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 17: ...ough Figure 13 show the bq51020EVM 520 PCB layout Figure 9 bq51020EVM 520 Top Assembly Figure 10 bq51020EVM 520 Layer 1 17 SLUUB03 April 2014 bq51020EVM 5 W WPC Integrated Wireless Receiver Power Supply Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 18: ... ti com Figure 11 bq51020EVM 520 Layer 2 Figure 12 bq51020EVM 520 Layer 3 18 bq51020EVM 5 W WPC Integrated Wireless Receiver Power Supply SLUUB03 April 2014 Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 19: ...out and Bill of Material Figure 13 bq51020EVM 520 Layer 4 19 SLUUB03 April 2014 bq51020EVM 5 W WPC Integrated Wireless Receiver Power Supply Submit Documentation Feedback Copyright 2014 Texas Instruments Incorporated ...

Page 20: ...een SMD 1 6x0 8x0 8mm LTST C190GKT Lite On D2 1 Orange LED Orange SMD 1 6x0 8x0 8mm LTST C190KFKT Lite On D4 1 5 1V Diode Zener 5 1V 300mW SOD 523 SOD 523 BZT52C5V1T 7 Diodes Inc H1 1 Tape segment Low Static Polyimide Film Cut tape section from 36 yard roll 1 5 x 2 3 5419 1 1 2 3M H2 1 Case Modified Polycase LP 11B with 4 screws J 6838A Polycase H3 1 Coil RX with Attractor IWAS4832FFEB9R7J50 Visha...

Page 21: ...4 TP3 TP4 TP5 3 White Test Point TH Miniature White Keystone5002 5002 Keystone TP6 1 White Test Point Miniature White TH White Miniature Testpoint 5002 Keystone U1 1 WPC MODE Qi INTEGRATED WIRELESS RECEIVER POWER SUPPLY YFP0042AWCG YFP0042AWCG bq51020YFP Texas Instruments C22 0 100pF CAP CERM 100pF 50V 10 X7R 0402 0402 CC0402KRX7R9BB101 Yageo America D3 0 Green LED Green SMD 1 6x0 8x0 8mm LTST C19...

Page 22: ...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 23: ...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 24: ...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 25: ...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 26: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments BQ51020EVM 520 ...

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