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STDES-WBC86WTX Wireless Power Transmitter Quick Start Guide and Test
Introduction
The
STDES-WBC86WTX
reference design, based on STWBC86, is designed for wireless power transmitter applications. It
allows the user to start a 2.5 W wireless charging project quickly.
The integrated circuit requires only a few external components, such as ASK (Qi based communication) demodulation circuit.
The board can work with 5 to 12 V input voltage.
Using an external USB-to-I²C converter, you can monitor and control the
The
STDES-WBC86WTX
includes several safety mechanisms that provides overtemperature (OTP), overcurrent (OCP), and
overvoltage (OVP) protections.
The
STDES-WBC86WTX
is a fully assembled reference design developed for performance evaluation only, not available for
sale.
This document summarizes the following fundamental evaluation steps:
•
Power-up test
•
ASK demodulation test
•
Efficiency test
•
Thermal performance test
TN1442 - Rev 2 - August 2023
For further information contact your local STMicroelectronics sales office.
STWBC86
using the
STSW-WPSTUDIO
TN1442
Technical note
Report
GUI.
www.st.com
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Table of Contents
Summary of Contents for ST STDES-WBC86WTX
- Page 1 TN1442 Technical note STDES-WBC86WTX Wireless Power Transmitter Quick Start Guide and Test Report Introduction STDES-WBC86WTX reference design, based on STWBC86, is designed for wireless power transmitter applications. It allows the user to start a 2.5 W wireless charging project quickly.
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Page 2: Overview
TN1442 Overview Overview To get started with the STDES-WBC86WTX, you need the following equipment: • STDES-WBC86WTX • Additional hardware: – 1 x USB adapter 5 V/1.5 A or power supply – 1 x USB cable (can be replaced with a pin cable) –... -
Page 3: Figure 2. Stwbc86 Block Diagram
TN1442 Overview Figure 2. STWBC86 block diagram TN1442 - Rev 2 page 3/25... -
Page 4: Specifications
TN1442 Specifications Specifications The STDES-WBC86WTX evaluation board is optimized for performance. The board features: • STWBC86 wireless power transmitter chip with BPP 1.2.4 compatible FW • Very few external components, optimized BOM and PCB space • On-chip high efficiency full bridge inverter •... -
Page 5: Test Points
TN1442 Test points Test points STDES-WBC86WTX features several connectors and test points to provide easy access to key signals. Figure 4. STDES-WBC86WTX test points Table 1. STDES-WBC86WTX test points Connector/test point Name Description Coil connection Transmitter coil connection AC1_COIL AC1_COIL... -
Page 6: Reference Design Specifications
TN1442 Reference design specifications Reference design specifications STDES-WBC86WTX target specifications are listed in the table below. Table 2. STDES-WBC86WTX design specifications Parameter Description Tx application PCB area 16 mm x 11 mm Inductance 6.8 µH, DCR 110 mOhm Tx coil specifications Dimensions 20.5 mm diameter x 2.8 mm... -
Page 7: Test Setup
STDES-WLC38WA as a receiver • an electronic load in CC mode (BK Precision 8500) Figure 5. STDES-WBC86WTX and STDES-STWLC38WA test setup Test procedure To achieve the best performance, follow the procedure below. Step 1. Test the power supply. The board is powered by voltage supplied by either a USB or a pin cable. This voltage can be monitored via the VOUT test point. - Page 8 STWBC86 for communication decoding. Step 6. Test the efficiency. Establish the power transfer between the STDES-WBC86WTX and the STDES-WLC38WA. Measure the input power and output power of the system and calculate the efficiency. Step 7. Test the thermal performance. Establish the power transfer and let the system achieve a steady operating temperature. Read the temperature using either the device internal thermal sensor or a thermal camera.
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Page 9: Measurements, Waveforms, And Test Data
TN1442 Measurements, waveforms, and test data Measurements, waveforms, and test data Power-up waveform The figure below shows a startup waveform, from the transmitter perspective. Figure 6. Start-up sequence of the STWBC86WTX and STWLC38WA The pinging start can be identified from the AC1 and AC2 waveforms. After registering the power signal, the receiver initializes communication. -
Page 10: Typical Performance Characteristics
TN1442 Typical performance characteristics Typical performance characteristics The following table shows the charging performance of an STDES-WBC86WTX/STDES-WLC38WA (TX/RX) setup at various load currents, with the temperature being measured after 5 minutes of continuous operation. Table 4. STDES-WBC86WTX typical performance Vin [V] (TX) -
Page 11: Thermal Performance
The following figure shows thermal performance of the board with a 2.5 W load (5 V/0.5 A on the Rx side) after 10 minutes of continuous operation. Figure 9. Thermal performance of the STDES-WBC86WTX at 2.5 W after 10 minutes Figure 10. Thermal performance of the STDES-WBC86WTX with the STDES-STWLC38WA after 10 minutes... -
Page 12: Design
TN1442 Design Design Schematic diagrams Figure 11. STDES-WBC86WTX circuit schematic (1 of 2) 180R F1 1.5A VIN_F BLM21SP181BH1 Shell Shield 100n 100n SMAJ22A-13-F Header 2 AGND STWBC86JR VINV VINV VINV VINV VINV VINV BOOT1 BOOT1 VSSP C7 47n BOOT2 BOOT2... -
Page 13: Figure 12. Stdes-Wbc86Wtx Circuit Schematic (2 Of 2)
TN1442 Schematic diagrams Figure 12. STDES-WBC86WTX circuit schematic (2 of 2) AC1_COIL C1 100n C2 100n C3 100n 1N4448HLP C4 47n AC1_COIL N.M. COIL VINV AC1_COIL 220k V5V0 N.M. V1V8 680p AGND V5V0 560R HE-RED HE-GRN GPIO0 GPIO1 PGND AGND... -
Page 14: Bill Of Materials
TN1442 Bill of materials Bill of materials Table 5. STDES-WBC86WTX bill of materials Item Q.ty Ref. Part/value Description Manufacturer Order code 100n C1206 C1, C2, C3 MLCC, NP0 Murata GRM31C5C1H104JA01L 50V 5% 47nF C1206 MLCC, NP0 Murata GCM31M5C1H473JA16L 50V 5%... - Page 15 TN1442 Bill of materials Item Q.ty Ref. Part/value Description Manufacturer Order code 20 mm diameter Wurth wireless TX coil 760308101104 Elektronik (not mounted) 100 mils pitch pin header, SIL-2 vertical, 7 mm, Harwin M20-9990246 black (not mounted) 100 mils pitch pin header, SIL-6 Harwin...
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Page 16: Pcb Layout
TN1442 PCB layout PCB layout Figure 13. STDES-WBC86WTX top layer Figure 14. STDES-WBC86WTX inner1 layer Figure 15. STDES-WBC86WTX inner2 layer TN1442 - Rev 2 page 16/25... -
Page 17: Figure 16. Stdes-Wbc86Wtx Bottom Layer
TN1442 PCB layout Figure 16. STDES-WBC86WTX bottom layer TN1442 - Rev 2 page 17/25... -
Page 18: Stdes-Wbc86Wtx Default Configuration
TN1442 STDES-WBC86WTX default configuration STDES-WBC86WTX default configuration Basic parameters: Table 6. STDES-WBC86WTX default configuration: basic parameters Parameter Value Tx bridge mode Full sync Minimum duty cycle Maximum duty cycle Minimum operating frequency 110 kHz Maximum operating frequency 148 kHz Ping duty cycle... -
Page 19: Conclusions
TN1442 Conclusions Conclusions The test results show the STDES-WBC86WTX reference design is capable of transmitting up to 2.5 W of power, while also: - achieving system efficiency of up to 60.23% with the STDES-WLC38WA, - maintaining chip temperature below 65°C after 10 minutes of continuous 2.5 W transmission operation, - and ensuring a robust ASK demodulation for a reliable communication with the power receiver. -
Page 20: Appendix A Reference Design Warnings, Restrictions And Disclaimer
TN1442 Reference design warnings, restrictions and disclaimer Appendix A Reference design warnings, restrictions and disclaimer Important: The reference design is not a complete product. It is intended exclusively for evaluation in laboratory/ development environments by technically qualified electronics experts who are familiar with the dangers and application risks associated with handling electrical/mechanical components, systems and subsystems. -
Page 21: Revision History
TN1442 Revision history Table 7. Document revision history Date Revision Changes 13-Feb-2023 Initial release. Modified title in cover page. 01-Aug-2023 Updated Section 5.1 Schematic diagrams Section 5.2 Bill of materials. TN1442 - Rev 2 page 21/25... -
Page 22: Table Of Contents
STDES-WBC86WTX default configuration ........ -
Page 23: List Of Tables
STDES-WBC86WTX default configuration: basic parameters ........ -
Page 24: List Of Figures
STDES-WBC86WTX and STDES-STWLC38WA test setup ........ - Page 25 ST’s terms and conditions of sale in place at the time of order acknowledgment. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of purchasers’...
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