Texas Instruments bq51013AEVM-765 User manual

User's Guide
SLUU911–June 2012
bq51013AEVM-765 Evaluation Module
The bq51013AEVM-765 wireless power receiver evaluation kit from Texas Instruments is a high-
performance, easy-to-use development kit for the design of wireless power solutions. Consisting of a 5-V
power supply receiver and associated magnetics, the kit enables designers to speed the development of
their end-applications.
Contents
1 Applications .................................................................................................................. 2
2 bq51013AEVM-765 Electrical Performance Specifications ........................................................... 2
3 Modifications ................................................................................................................. 2
4 Connector and Test Point Descriptions .................................................................................. 2
4.1 Input/Output Connections ......................................................................................... 2
4.2 Jumpers/Switches .................................................................................................. 3
4.3 Test Point Descriptions ............................................................................................ 3
5 Schematic and Bill of Materials ........................................................................................... 5
6 Test Setup ................................................................................................................... 6
6.1 Equipment ........................................................................................................... 6
6.2 Equipment Setup ................................................................................................... 7
6.3 Load Step ........................................................................................................... 8
6.4 Load Dump ......................................................................................................... 9
6.5 V-Adapter Input ..................................................................................................... 9
6.6 Start-Up ............................................................................................................ 10
6.7 Disable Shutdown ................................................................................................ 10
6.8 System Efficiency ................................................................................................. 11
6.9 Dynamic Rectifier Control / Dynamic Efficiency Scaling .................................................... 11
7 Layout Guidelines ......................................................................................................... 12
8 bq51013AEVM-765 Assembly Drawings and Layout ................................................................. 13
9 Reference ................................................................................................................... 16
List of Figures
1 HPA765AEVM Schematic ................................................................................................. 5
2 Equipment Setup............................................................................................................ 7
3 Load Step, 0 mA to 500 mA............................................................................................... 8
4 Load Dump, 500 mA to 0 mA ............................................................................................. 9
5 V-Adapter Input.............................................................................................................. 9
6 Start-Up..................................................................................................................... 10
7 Equipment Shutdown Wireless Disable ................................................................................ 10
8 bq51013AEVM-765 Efficiency vs Output Power ...................................................................... 11
9 bq51013AEVM-765 V-rect vs Output Power........................................................................... 11
10 QFN Layout ................................................................................................................ 12
11 Top Assembly.............................................................................................................. 13
12 Top Copper Layer......................................................................................................... 14
13 Bottom Copper Layer .................................................................................................... 15
14 Bottom Assembly.......................................................................................................... 16
bqTESLA is a trademark of Texas Instruments.
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List of Tables
1 bq51013AEVM-765 Electrical Performance Specifications ........................................................... 2
2 Bill of Materials.............................................................................................................. 6
1 Applications
The bq51013AEVM-765 evaluation module (EVM) demonstrates the receiver portion of the bqTESLA™
wireless power system. This receiver EVM is a complete receiver-side solution that produces 5 V out at up
to 1 A when coupled with the bqTESLA™ transmitter. The bq51013AEVM-765 device shown on this EVM
along with external components that support the device for a complete solution.
• The bqTESLA™ receiver can be used in any number of low-power battery portable devices as a power
source for charging. With contact-free charging capability, no connections to the device are needed.
• Output voltage of 5 V up to 1 A
• External adapter switchover and control circuit
• Low-profile, external pick-up coil
• Frame is configured to provide correct receiver to transmitter spacing.
• Room above coil for testing with battery, key for tuning
• Adjustable resistor R16 can be used to set max output current
2 bq51013AEVM-765 Electrical Performance Specifications
Table 1 provides a summary of the bq51013AEVM-765 performance specifications. All specifications are
given for an ambient temperature of 25°C.
Table 1. bq51013AEVM-765 Electrical Performance Specifications
Parameter Notes and Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
VIN Input Voltage Typical V-rectified voltage at TP12 4 5.5 8 V
VADAPTER Adapter Input Voltage 4 7 20 V
Input Overvoltage Voltage at V-rectified 15 V
OVP Protection
OUTPUT CHARACTERISTICS
VOUT V J3 to J4 5 V
IOUT I J3 1 A
SYSTEMS CHARACTERISTICS
FSSwitching Frequency 110 205 kHz
Eff Efficiency Output current 500 mA 74 %
3 Modifications
See the data sheet (SLUSAY6) when changing components. To aid in such customization of the EVM, the
board was designed with devices having 0603 or larger footprints. A real implementation likely occupies
less total board space.
Note that changing components can improve or degrade EVM performance.
4 Connector and Test Point Descriptions
4.1 Input/Output Connections
The connections points are described in the following paragraphs.
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www.ti.com Connector and Test Point Descriptions
4.1.1 J1 – AD External Adapter Input, J2-GND
Power can be provided to simulate an external adapter applied to the receiver. When this is done, an End
Power Transfer signal is sent to the transmitter which enters a low power state. External adapter voltage
must be a minimum of 4 V but not exceed 20V.
4.1.2 J3 – Output Voltage, J4-GND
Output voltage is 5 V in wireless power mode up to 1 A or adapter voltage if adapter is used.
4.1.3 J5 – TS and Return Connector
External connection for Temperature Sense Resistor, see data sheet for additional info.
4.1.4 J6 – Programming Connector
This connector is only useful at factory level.
4.2 Jumpers/Switches
The control jumpers are described in the following paragraphs.
4.2.1 JP1 – EN1 Enable 1
One of two Enable signals that controls the Adapter and Wireless power transfer. Low on EN1 enables the
wireless power transfer; High disables the wireless power transfer. The Default Shorting jumper setting is
Low.
4.2.2 JP2 – EN2 Enable 2
One of two Enable signals that controls the Adapter and Wireless power transfer. Low on EN2 enables the
adapter power transfer also High disables Comm-IILIM . Default Shorting jumper setting is Low.
4.2.3 JP3 – TS Enable or Disable
This jumper enables the TS adjustment feature using R3. The Disable position sets voltage at the TS pin
to a safe value. The Default Shorting jumper setting is disabled
4.2.4 JP4 – Pull-Up to Out or Vz
EN1 and EN2 pull-up along with LED D1 can be powered from OUT or RECT. Vz is derived from RECT
through a resistor and zener diode.
4.2.5 JP5 – CS100 TS Enable or Disable
Only used for bq51014 device. This jumper along with R14 and R13 will enable the Charge Status 100%
feature. See data sheet for additional info. Open will disable.
4.2.6 JP6 – ILIM Fix or ADJ
Max output current is set by I-lim pin. In the FIX position current is set to 1.2A max. In the ADJ position
current is set by R16.
4.3 Test Point Descriptions
The test points are described in the following paragraphs.
4.3.1 TP1 – AD_EN
This push-pull driver for the external PFET connects the Adapter and the Output from the bq51013.
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4.3.2 TP2 – AC Input 2
This is the test point for measuring ac voltage applied to the EVM from the receiver coil.
4.3.3 TP3 – Com2 Communication 2 Drive
Communication driver signal, open-drain output connected to communication capacitor.
4.3.4 TP4 – AC Input 1
This is the test point for measuring ac voltage applied to the EVM from the receiver coil.
4.3.5 TP5 – CLMP 1
Overvoltage clamp driver signal, open-drain output is connected to OVP capacitor.
4.3.6 TP6 – CLMP 2
Overvoltage clamp drive signal, open-drain output is connected to OVP capacitor.
4.3.7 TP7 – OUT Output Voltage
This test point is the output voltage from the bq51013 or the Adapter input.
4.3.8 TP8 – Boot-1 Boot Capacitor
This bootstrap capacitor 1 drive connects to the integrated circuit (IC).
4.3.9 TP9 – Boot-2 Boot Capacitor
This bootstrap capacitor 2 drive connects to the IC.
4.3.10 TP10 – CHG Charge
This output signal indicates that the output current is being delivered to OUT, the open-drain output.
4.3.11 TP11 – AC1 IC input
This is the ac input to the IC from series capacitors.
4.3.12 TP12 – Rectified Voltage
The input ac voltage is rectified into unregulated dc voltage; additional capacitance is used to filter the
voltage before the regulator.
4.3.13 TP13, TP14, TP15 – GND
These are the ground test points.
4.3.14 TP16 – TS Temp Sensor
This is the connection point for external thermistor; see the data sheet for additional information.
4.3.15 TP17 – FOD
Input for rectified power measurment, pin 14 of the IC.
4.3.16 TP18– ILIM
Programming pin for over current limit, pin 12 of the IC.
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www.ti.com Schematic and Bill of Materials
5 Schematic and Bill of Materials
NOTE: For Reference Only, See Table 2 for Specific Values
Figure 1. HPA765AEVM Schematic
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Table 2. Bill of Materials
COUNT RefDes Value DESCRIPTION SIZE Part Number MFR
1 U1 bq51013ARHL IC, bq51013A Wireless Power Receiver QFN-20 bq51013ARHL TI
1 Q1 CSD75205W1015 MOSFET, Dual PChan, -20V, 1.2A, CSP CSD75205W1015 TI
190 milliOhm 1x1.5mm
2 C1, C2 68nF Capacitor, Ceramic, 50V, X7R, 10% 0603 Std Std
1 C3 47nF Capacitor, Ceramic, 50V, X7R, 10% 0603 Std Std
1 C4 1800pF Capacitor, Ceramic, 50V, X7R, 10% 0603 Std Std
1 C5 100pF Capacitor, Ceramic, 50V, X7R, 10% 0603 Std Std
4 C6, C16, C18, 0.1uF Capacitor, Ceramic, 50V, X7R, 10% 0603 Std Std
C19
2 C7, C17 1.0uF Capacitor, Ceramic, 25V, X5R, 10% 0603 Std Std
2 C8, C13 22nF Capacitor, Ceramic, 50V, X7R, 10% 0603 Std Std
2 C9, C12 0.47uF Capacitor, Ceramic, 25V, X5R, 10% 0603 Std Std
2 C10, C11 0.01uF Capacitor, Ceramic, 50V, X7R, 10% 0603 Std Std
2 C14, C15 10uF Capacitor, Ceramic, 25V, X5R, 10% 1206 Std Std
1 C20 1.0uF Capacitor, Ceramic, 50V, X5R, 10% 0805 Std Std
1 D1 LTST-C190GKT Diode, LED, Green, 2.1-V, 20-mA, 6-mcd 0603 LTST-C190GKT Lite On
1 D2 5.1V Diode, Zener, 5.1V, 300mW SOD-523 BZT52C5V1T Diodes, Inc.
0 R1, R5, R14 Open Resistor, Chip, 1/16W, 1% 0603 STD STD
1 R2 140 Resistor, Chip, 1/16W, 1% 0603 Std Std
1 R3 200k Potentiometer, 1/4 in. Cermet, 12-Turn, 0.25x0.17 3266W-1-204LF Bourns
Top-Adjust
1 R4 110 Resistor, Chip, 1/16W, 1% 0603 Std Std
0 R6, R12 Open Resistor, Metal Film, 1/4 watt, ± 1% 1206 CRCW120624R0FKEA Vishay
1 R7 1.50K Resistor, Chip, 1/16W, 1% 0603 Std Std
2 R8, R9 200 Resistor, Chip, 1/16W, 1% 0603 Std Std
1 R10 499 Resistor, Chip, 1/16W, 1% 0603 Std Std
1 R11 10.0k Resistor, Chip, 1/16W, 1% 0603 Std Std
1 R15 110K Resistor, Chip, 1/16W, 1% 0603 Std Std
0 R13 Open Potentiometer, 1/4 in. Cermet, 12-Turn, 0.25x0.17 3266W-1-203LF Bourns
Top-Adjust
1 R16 5k Potentiometer, 1/4 in. Cermet, 12-Turn, 0.25x0.17 3266W-1-502LF Bourns
Top-Adjust
1 Coil, RX with Attractor IWAS-4832FF-50 or Vishay or
WR-483250-15M2-G or TDK or
760308201 Wurth
6 Test Setup
6.1 Equipment
6.1.1 bqTESLA™ Transmitter
Power for the bq51013AEVM-765 receiver EVM is supplied through a bqTESLA™ transmitter
(bq500210EVM-689) or WPC-certified transmitter. The input ac voltage is applied to the receiver through
the coil located in the receiver bottom.
6.1.2 Voltage Source
Input power supply to the bqTESLA™ transmitter(bq500210EVM-689) is typically 19 Vdc ±200 mV at 500
mA maximum, but consult transmitter specification. To simulate an external adapter, an additional 5 V at
the 1-A power supply is used.
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+
-V
Wireless
Transmitter
V
A
A
RL
LPLS
AC1
OUT-J3
VI
VRECT-TP12
AC2
GND-J4
OUT-TP7
Wireless Receiver
bq51013AEVM-765
+-
GND-J2V-adapter-J1
www.ti.com Test Setup
6.1.3 Meters
Output voltage can be monitored at TP7 with a voltmeter. Input current into the load must be monitored
with an appropriate ammeter. Transmitter input current and voltage can be monitored also but the meter
must use averaging function for reducing error due to communications packets.
6.1.4 Loads
A single load is required for 5 V with a maximum current of 1 A. The load can be resistive or electronic.
6.1.5 Oscilloscope
A multichannel oscilloscope with appropriate probes is used to observe the RECT voltage at TP12 and
other signals.
6.1.6 Recommended Wire Gauge
For proper operation, 22 AWG wire is recommended when connecting the bq51013AEVM-765EVM to
loads.
6.2 Equipment Setup
• With the power supply off, connect supply to the bqTESLA™ transmitter.
• Place the bqTESLA™ receiver on the transmitter.
• Connect load to J3 with return to J4, monitor current through load with ammeter, and monitor current to
load at TP7.
• Typical output voltage is 5 V, and the output current range is 0 mA to 1 A.
6.2.1 Equipment Setup Diagram
The diagram of Figure 2 shows the equipment test setup.
Figure 2. Equipment Setup
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V-RECT
TP7 5V-OUT
I-OUT
Test Setup www.ti.com
6.2.2 EVM Setup Procedures
This section guides the user through a few general test procedures to exercise the functionality of the
presented hardware. A few key notes:
• To probe the output voltage of the receiver, connect the probe to TP7.
• To probe the rectifier voltage, connect the probe to TP12.
• The V-adapter supply which simulates an external adapter is connected to J1.
• All voltmeters must be Kelvin connected (at the pin) to the point of interest.
• The output load is recommended to be a variable power resistor or electronic load.
6.3 Load Step
The procedure for load step is as follows:
• Set up the test bench as described in Section 6.2.
• Power TX with 19 V.
• Provide a load step from no load (high impedance) to 10 Ωor 500 mA (if using a current source load).
• Monitor load current, rectifier voltage, and output voltage as shown in the following illustrations.
Figure 3. Load Step, 0 mA to 500 mA
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V-RECT
TP7 5V-OUT
V-ADAPTER
V-RECT
TP7 5V-OUT
I-OUT
www.ti.com Test Setup
6.4 Load Dump
The procedure for load dump is as follows:
• Set up the test bench as described in Section 6.2.
• Power TX with 19 V.
• Provide a load dump from 10 Ωor 500 mA (if using a current source load) to no load (high
impedance).
• Monitor load current, rectifier voltage, and output voltage as shown in the following illustration.
Figure 4. Load Dump, 500 mA to 0 mA
6.5 V-Adapter Input
The procedure for external adapter (wired adapter) testing is as follows:
• Set up the test bench as described in Section 6.2.
• Power TX with 19 V
• Apply a 6-V V-adapter input voltage.
• Monitor load current, rectifier voltage, output voltage, and V-adapter voltage as shown in the following
illustration.
Figure 5. V-Adapter Input
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V-RECT
TP7 5V-OUT
EN1
I-OUT
V-RECT
TP7 5V-OUT
TP2 AC-IN
Test Setup www.ti.com
6.6 Start-Up
The procedure demonstrates start-up:
• Set up the test bench as described in Section 6.2.
• Power TX with 19 V.
• Trigger scope sweep on TP2 AC IN.
Figure 6. Start-Up
6.7 Disable Shutdown
The jumper JP1 (EN1) sends an End Power Transfer to Transmitter, Shutdown:
• With unit operating normally, move jumper JP1 from Low to High position.
• LED D1 turn OFF; output voltage drops to 0 V.
• Return jumper to Low position, RX restarts.
Figure 7. Equipment Shutdown Wireless Disable
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