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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
1
Introduction
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2
Considerations with this EVM
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3
Modifications
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4
Recommended Operation Condition
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5
Equipment and EVM Setup
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5.1
Schematic
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5.2
Connector and Test Point Descriptions
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5.3
Jumpers/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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6
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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7
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
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7.6
Thermal Performance
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8
Dual Mode Coil Design Consideration
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8.1
Shielding
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8.2
Receiver Detection: Attraction and Alignment
.................................................................
8.3
Inductor Value
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9
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
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9.4
bq51221EVM-520 Layout
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9.5
Bill of Materials
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List of Figures
1
SLUUAX6B – February 2014 – Revised June 2014
Dual Mode (WPC and PMA) Integrated Wireless Receiver Power Supply
Copyright © 2014, Texas Instruments Incorporated