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Introduction

www.ti.com

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Adapter Insertion and Removal

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Thermal Image (1000-mA Load)

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bq51020EVM-520 Layout Example

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bq51020EVM-520 Top Assembly

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bq51020EVM-520 Layer 1

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bq51020EVM-520 Layer 2

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bq51020EVM-520 Layer 3

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bq51020EVM-520 Layer 4

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List of Tables

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bq51020EVM-520 Electrical Performance Specifications

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Pin Description

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bq51020EVM-520 Bill of Materials

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1

Introduction

The bq51020 is an advanced, flexible, secondary-side device for wireless power transfer in portable
applications. The bq51020 device integrates an ultra-low-impedance synchronous rectifier, a very-high-
efficiency post regulator, digital control, and accurate voltage and current loops. The bq51020 devices
provide the AC/DC power conversion while integrating the digital control required. The IC complies with
the WPC v1.1 communication protocol.

Together with the bq500xxx primary-side controller transmitter, the bq51020 enables a complete
contactless power transfer system for a wireless power supply solution. By utilizing near-field inductive
power transfer, the secondary coil embedded in the mobile device can pick up the power transmitted by
the primary coil. The voltage from the secondary coil is then rectified and regulated to be used as a power
supply for down-system electronics. Global feedback is established from the secondary to the primary in
order to control the power transfer 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.

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Considerations with this EVM

The bq51020EVM-520 evaluation module (PWR520-002) demonstrates the receiver portion of the
wireless power system. This receiver EVM is a complete receiver-side solution that produces 5-W output
power at up to 1-A load with adjustable output voltage.

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The receiver can be used in any number of low-power battery portable devices as a power supply for a
battery charger. With contact-free charging capability, no connections to the device are needed.

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Highly-integrated wireless power receiver solution

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Ultra-efficient synchronous rectifier

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Very-high efficiency post regulator

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WPC v1.1-compliant communication and control

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Only one IC required between RX coil and DC output

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Programmable output voltage to optimize performance for application

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Adaptive Communication current limit (CM_ ILIM) for robust communication.

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Supports 20-V max input

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Low-power dissipative overvoltage clamp

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Overvoltage, overcurrent, overtemperature protection

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Low-profile, external pick-up coil

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Frame is configured to provide correct receiver to transmitter spacing

2

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

SLUUB03 – April 2014

Submit Documentation Feedback

Copyright © 2014, Texas Instruments Incorporated

Содержание bq51020EVM

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 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 ...

Страница 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...

Страница 26: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments BQ51020EVM 520 ...

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