Texas Instruments bq50002 User manual

User's Guide
SLVUAJ7–October 2015
bq50002 Wireless Power TX EVM
The bqTESLA™ wireless power transmitter evaluation module from Texas Instruments is a high-
performance, easy-to-use development module for the design of wireless power solutions. The bq50002
evaluation module (EVM) provides all the basic functions of a Qi-compliant, wireless charger pad. The 5-V
input, single coil transmitter enables designers to speed the development of their end-applications. The
EVM supports both the Qi WPC 1.0, WPC 1.1, and WPC 1.2 receivers and will support output power up to
5 W.
Contents
1 Applications................................................................................................................... 2
2 bq50002EVM-607 Electrical Performance Specifications.............................................................. 2
3 Modifications.................................................................................................................. 3
4 Connector and Test Point Descriptions................................................................................... 3
4.1 Input/Output Connections.......................................................................................... 3
4.2 Test Point Descriptions ............................................................................................ 4
5 Schematic and Bill of Materials ............................................................................................ 8
6 Test Setup................................................................................................................... 11
6.1 Equipment.......................................................................................................... 11
6.2 Equipment Setup.................................................................................................. 12
6.3 EVM Procedure.................................................................................................... 13
7 bq50002EVM-607 Assembly Drawings and Layout ................................................................... 18
8 Reference ................................................................................................................... 20
List of Figures
1 bq50002EVM-607 Schematic .............................................................................................. 8
2 Connections of the EV2400 kit ........................................................................................... 13
3 bqStudio Window........................................................................................................... 14
4 Device ID.................................................................................................................... 14
5 Efficiency vs Power, bq50002EVM-607 TX and bq51013BEVM-764 Receiver.................................... 16
6 Start Up...................................................................................................................... 16
7 Thermal Performance...................................................................................................... 17
8 Assembly Top............................................................................................................... 18
9 Inner Layer 1................................................................................................................ 19
10 Inner Layer 2................................................................................................................ 19
11 Bottom Layer................................................................................................................ 20
List of Tables
1 bq50002EVM-607 Electrical Performance Specifications.............................................................. 2
2 Bill of Materials............................................................................................................... 9
bqTESLA is a trademark of Texas Instruments.
Avid is a registered trademark of Avid Technology, Inc..
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1 Applications
The bq50002EVM-607 evaluation module demonstrates the transmitter portion of the bqTESLA™ wireless
power system. This transmitter EVM is a complete transmitter-side solution that powers a bqTESLA
receiver. The EVM requires a single 5-V power supply capable of up to 2.0 A to operate and combines the
transmitter electronics, input power circuit, LED indicators, and the transmitting coil on the single printed-
circuit board (PCB). The open design allows easy access to key points of the electrical schematic.
This EVM has the following features:
• Qi-Certified WPC 1.2 solution for 5-W operation
• 5-V input and fixed operation voltage
• Enhanced Foreign Object Detection (FOD)
• WPC 1.2 FOD
• Transmitter-coil mounting pad providing the correct receiver interface
• Highly-integrated analog front end including LDO, FETs, drivers, current sense amplifier, and de-
modulation circuit
• Standard WPC A11-type transmitter coil with no magnet
• LED and audio indication of power transfer
2 bq50002EVM-607 Electrical Performance Specifications
Table 1 provides a summary of the EVM performance specifications. All specifications are given for an
ambient temperature of 25°C.
Table 1. bq50002EVM-607 Electrical Performance Specifications
Parameter Notes and Conditions Min Typ Max Unit
Input Characteristics
VIN Input voltage 4.5 5 5.5 V
IIN Input current VIN = Nom, IOUT = 1 A at 5 V 1.4 A
Input no-load current VIN = Nom, IOUT = 0 A 165 mA
Input stand-by current VIN = Nom 4 mA
Output Characteristics – Receiver bq51013BEVM-764
VOUT Output voltage VIN = Nom, IOUT = 1 A , VOUT = 5 V 4.95 5.00 5.04 V
Output ripple VIN = Nom, IOUT = 1.0 A, VOUT = 5 V 200 mVPP
IOUT VIN = Min to Max VIN = Min to Max, VOUT = 5 V 0 1.5 A
Systems Characteristics
FSSwitching frequency During power transfer 110 205 kHz
ηpk Peak efficiency VIN = Nom, P Out RX = 3 W 74 %
ηFull-load efficiency VIN = Nom, IOUT = Max 71 %
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3 Modifications
See the datasheet (SLUSBW1) when changing components.
FOD – R27 threshold and R26 FOD_Cal (see Section 6.3.9)
4 Connector and Test Point Descriptions
4.1 Input/Output Connections
The connection points are described in Section 4.1.1 through Section 4.1.4.
4.1.1 J1 – VIN
Input power 5 V ±500 mV, return at J3.
4.1.2 J2 – USB Input
USB input connection.
4.1.3 J3 –GND
Return for input power, input at J1.
4.1.4 J4 – Serial Interface
I2C interface connection to communicate with the IC. Used with bqStudio tool to monitor behavior
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4.2 Test Point Descriptions
The test points are described in Section 4.2.1 through Section 4.2.56.
4.2.1 TP1 – CS+
Current sense amplifier positive input.
4.2.2 TP2 – CS–
Current sense amplifier negative input.
4.2.3 TP3 – VIN
Input power, 5 V ±500 mV.
4.2.4 TP4 – GND
Return for input power.
4.2.5 TP5 –DMIN1
Modulation signal input from coil for DEMOD Channel 1.
4.2.6 TP6 –SW1
Switch node of the half bridge MOSFETs.
4.2.7 TP7 – GND
Low-noise ground test point (TP).
4.2.8 TP8 –Low-Noise Analog Ground
Low-noise ground TP.
4.2.9 TP9 – GND
Low-noise ground TP.
4.2.10 TP10 – GND
Low-noise ground TP.
4.2.11 TP11 – PGND
Return for SW1.
4.2.12 TP12 – DMIN2
Modulation signal input from coil for DEMOD Channel 2.
4.2.13 TP13 – PEAK
Peak detection.
4.2.14 TP14 – SW2
Switch node of the half-bridge MOSFETs.
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4.2.15 TP15 – BP3
Output of 3-V LDO.
4.2.16 TP16 – TANK
Coil signal at junction between transmitter coil and resonant capacitors.
4.2.17 TP17 – PGND
Return for SW2.
4.2.18 TP18 – PWM1/CLK
Input to control half-bridge MOSFETs connected to SW1 when PWM_CTRL is high. The operating
frequency/pulse width changes up or down depending on every rising edge of this periodic signal when
PWM_CTRL is low.
4.2.19 TP19 – PWM2/UPDN
Input to control half-bridge MOSFETs connected to SW2 when PWM_CTRL is high. Increase or decrease
power transfer when PWM_CTRL is low.
4.2.20 TP20 – CSO
Output of the current sense amplifier.
4.2.21 TP21 – DMOUT1
Demodulated 2-kHz bit stream from demodulation channel 1.
4.2.22 TP22 – DMOUT2
Demodulated 2-kHz bit stream from demodulation channel 2.
4.2.23 TP23 – BUZZ
DC output when power transfer is started. Can be used to drive a DC style buzzer or LED. See data sheet
for more information.
4.2.24 TP24 – LED_B
Status indication, typically RED.
4.2.25 TP25 – LED_A
Status indication, typically GREEN.
4.2.26 TP26 – LED_C
Status indication, typically ORANGE.
4.2.27 TP27 – LED_MODE
LED mode selection.
4.2.28 TP28 – T_SENSE
Temperature sensing for safety shutdown.
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4.2.29 TP29 – FOD_CAL
FOD calibration.
4.2.30 TP30 – FOD_THR
FOD threshold.
4.2.31 TP31 – V_SENSE
Input voltage sense.
4.2.32 TP32 – FLIM
Leave floating to conform to WPC specification 205-kHz maximum operating frequency.
4.2.33 TP33 – ILIM
ILIM can be used to restrict the input current in order to operate with a limited input voltage source. Leave
this pin open if no fixed current limit should be used.
4.2.34 TP34 – Reserved IC Pin 5
Unused.
4.2.35 TP35 – Unused IC Pin 7
Leave this pin open.
4.2.36 TP36 – Unused IC Pin 25
Leave this pin open.
4.2.37 TP37 – Unused IC Pin 27
Leave this pin open.
4.2.38 TP38 - Unused IC Pin 17
Leave this pin open.
4.2.39 TP39 - Unused IC Pin 6
Leave this pin open.
4.2.40 TP40 - Unused IC Pin 24
Leave this pin open.
4.2.41 TP41 - Unused IC Pin 26
Leave this pin open.
4.2.42 TP42 - Unused IC Pin 18
Leave this pin open.
4.2.43 TP43 – CLK_IN
CLK_OUT signal from the internal oscillator of the bq50002.
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4.2.44 TP44 – MODE
Control of frequency/pulse width of the internal generated oscillator signal.
4.2.45 TP45 – SDA
I2C data.
4.2.46 TP46 – SCL
I2C clock.
4.2.47 TP47 – 3-V Rail Resistor Divider
4.2.48 TP49 – Floating Test Point
4.2.49 TP50 – Floating Test Point
4.2.50 TP51 – GND
4.2.51 TP52 - Floating Test Point
4.2.52 TP53 - Floating Test Point
4.2.53 TP54 – GND
4.2.54 TP55 – Floating Test Point
4.2.55 TP56 – Floating Test Point
4.2.56 TP57 – GND
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2.00
R11
TP1
DNP
TP2
DNP
2.2µF
C3
TP6
DNP
0.047µF
C10
0.1µF
C7
22µF
C6
0.2
R8
PGND
PGND
0.1µF
C11
22µF
C4
0.1µF
C14
0.1µF
C5
TP14
DNP
0.1µF
C20
TP15
DNP
PWM1_/_CLK_IN
1
PWM_CTRL
2
EN
3
BP3
4
GND
5
GND
6
DMOUT 2
7
DMOUT 1
8
CLK_OUT
9
MODE
10
DMIN 1
11
DMIN 2
12
GND
13
PVIN2 14 PVIN2 15
BOOT2 16
SW2 17
SW2 18
SW2 19
PGND 20
PGND 21
PGND 22
SW1 23
SW1 24
BOOT1 25
SW1 26
PVIN1 27 PVIN1 28
CSN
29
CSP
30
CSO
31
PWM2_/_UP_DN
32
QFN_PAD
U2
bq50002
0.047µF
C18
D3
0.2
R16
PGND
PGND
0.022µF
C12
GND499k
R10
2700pF
C15
GNDGND
TP12
DNP
69.8k
R6
TP5
DNP
1000pF
C9
10.0k
R7
GND
+5 VIN
TP3
1.00k
R4
1
2
3
4
5
6
7
8
9
10
11
J2
- N/C -
22µF
C8
Green
D1
TP4
NT1
Net-Tie
GND
PGNDGND
USB
0.02
R18
PGND
J1
J3
0
R5
0
R3
GND
GND
1µF
C1
1µF
C2
GND GND
L1
760308111
L2
DNP
TP17
PGND
PGND
TP11
TP18
DNP
TP19
DNP
GND
0.47µF
C25
GND
0.1µF
C24
0.1µF
C22
GND
TP20
DNP 0.1µF
C23
GND
1.00k
R19
Green
D6
TP25
DNP
1.00k
R9
TP24
DNP
GND
1.00k
R17
TP26
DNP
Orange
D4
10.0k
R28
TP23
DNP
BUZ1
TP34
DNP
TP39
DNP
TP35
DNP
TP37
DNP
TP41
DNP
TP36
DNP
TP40
DNP
GND
TP38
DNP
TP42
DNP
Red
D5
PWM1_/_CLK_OUT 1
PWM2_/_UP_DN 2
ISENSE 3
ILIM
4
Reserved
5
Unused
6
Unused
7
VPEAK
8
VSENSE
9
FOD_CAL
10
LED_A 11
LED_B 12
TSENSE
13
LED_C 14
BUZZ 15
MODE 16
Unused
17
Unused
18
Reserved
19
Reserved
20
CLK_IN 21
COMM1 22 COMM2 23
Unused
24
Unused
25
Unused
26
Unused
27
SDA
28 SCL
29
VCORE
30
DVSS 31
DVCC
32
FLIM
33
LED_MODE
34
FOD_THR
35
AVSS 36
DRV_EN 37
PWM_CTRL 38
AVSS 39
AVCC
40
QFN PAD 41
U1
bq500511
TP22
DNP
TP21
DNP
GND
TANK
TP16
TANK
10.0k
R20
GND GNDGND GND
200k
R23
100k
R27
100k
R21
24.9k
R25
100k
R22
80.6k
R26
0.1µF
C27
TP30
DNP
TP27
DNP
TP29
DNP
TP28
DNP 76.8k
R13
10.0k
R14
0.1µF
C28
DNP
GND
TP31
DNP
1.) FOD-THR R23/R27--400mW
2.) LED R21/R25--Mode 1
3.) FOD_CAL R22/R26--72mW/A (1.339V)
VSENSE
FOD_CALTSENSELED MODE FOD THR
PEAK
VSENSE
FOD_CAL
LED MODE
FOD THR
TSENSE
10.0k
R24
10.0k
R12
VCC_3
JTAG
GND
12
34
56
78
910
1112
1314
J5
1000pF
C26
47k
R15 GND
VCC_3
JTAG_DATA
JTAG_CLK
SCL
SDA
JTAG_CLK
JTAG_DATA
VCC_3 VCC_5
VCC_5
GND
GND
TP13
DNP 2200pF
C13
113k
R1
7.50k
R2
D2
PEAK
VCC_3
GND
SDA
SCL
4
1
2
3
J4
22-05-3041 2.2µF
C21
GND
TP33
DNP
TP32
DNP
TP7 TP8 TP9 TP10
TP44
DNP
TP43
DNP
10.0k
R32 DNP
GND
10.0k
R33
DNP
TP47
DNP
TP50
DNP
10.0k
R31
DNP
VCC_3
GND
TP53
DNP
TP51
DNP
TP54
DNP
TP57
DNP
TP56
DNP
TP49
DNP
TP52
DNP
TP55
DNP
GND
TP45
DNP TP46
DNP
10.0k
R30
DNP
GND
10.0k
R29 DNP
VCC_3
_
GND
0.1µF
C16
0.1µF
C17
0.1µF
C19
10.0k ohm
t°
NTC1
Schematic and Bill of Materials www.ti.com
5 Schematic and Bill of Materials
This section includes the schematics and bill of materials for the EVM.
Figure 1 illustrates the schematics for this EVM.
Figure 1. bq50002EVM-607 Schematic
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Table 2 contains the BOM for this EVM.
Table 2. Bill of Materials(1)
Designator Qty Value Description Package Reference Part Number Manufacturer Alternate Part Alternate
Number Manufacturer
!PCB1 1 Printed Circuit Board PWR607 Any - -
BUZ1 1 Buzzer, Piezo, 4kHz, 12.2mm, TH 12.2x4.0mm PS1240P02CT3 TDK
C1, C2 2 1uF CAP, CERM, 1 µF, 25 V, +/- 10%, X7R, 0603 0603 GRM188R71E105KA12D MuRata
C3 1 2.2uF CAP, CERM, 2.2 µF, 10 V, +/- 10%, X7R, 0603 0603 GRM188R71A225KE15D MuRata
C4, C6 2 22uF CAP, CERM, 22uF, 25V, +/-20%, X5R, 0805 0805 GRM21BR61E226ME44 MuRata
C5, C7, C11, C20, C22, C23, 8 0.1uF CAP, CERM, 0.1uF, 25V, +/-10%, X7R, 0603 0603 C1608X7R1E104K TDK
C24, C27
C8 1 22uF CAP, CERM, 22uF, 25V, +/-10%, X7R, 1210 1210 GRM32ER71E226KE15L MuRata
C9, C26 2 1000pF CAP, CERM, 1000pF, 50V, +/-5%, C0G/NP0, 0603 0603 C1608C0G1H102J TDK
C10, C18 2 0.047uF CAP, CERM, 0.047uF, 50V, +/-10%, X7R, 0603 0603 C1608X7R1H473K TDK
C12 1 0.022uF CAP, CERM, 0.022 µF, 50 V, +/- 10%, X7R, 0603 0603 C1608X7R1H223K TDK
C13 1 2200pF CAP, CERM, 2200 pF, 50 V, +/- 10%, X7R, 0603 0603 GRM188R71H222KA01D MuRata
C14, C16, C17, C19 4 0.1uF CAP, CERM, 0.1 µF, 25 V, +/- 5%, C0G/NP0, 1206 1206 C3216C0G1E104J TDK
C15 1 2700pF CAP, CERM, 2700pF, 50V, +/-5%, C0G/NP0, 0603 0603 C1608C0G1H272J TDK
C21 1 2.2uF CAP, CERM, 2.2uF, 16V, +/-10%, X5R, 0603 0603 GRM188R61C225KE15D MuRata
C25 1 0.47uF CAP, CERM, 0.47uF, 10V, +/-10%, X7R, 0603 0603 GRM188R71A474KA61D MuRata
D1, D6 2 Green LED, Green, SMD 1.6x0.8x0.8mm LTST-C190KGKT Lite-On
D2, D3 2 100V Diode, Switching, 100V, 0.2A, SOD-323 SOD-323 MMDL914-TP Micro Commercial
Components
D4 1 Orange LED, Orange, SMD 1.6x0.8x0.8mm LTST-C190KFKT Lite-On
D5 1 Red LED, Red, SMD Red LED, 1.6x0.8x0.8mm LTST-C190CKT Lite-On
H1 1 Cover, Plastic Polycarbonate, 2.75 " Square, 0.93 thick MCH002 Any - -
H2, H5, H8, H11 4 Standoff, Nylon, Female to Male, 4-40 x 1/4" 4-40 x 1/4" 4800 Keystone - -
H3, H6, H9, H12, H17, H20 6 Mounting Feet, 0.25" tall 2563 Voltrex
H4 1 Plate, aluminum 2.0"x2.0"x0.062" MCH003 Any - -
H7 1 Sil-Pad Cut to Size 2.0" Square See Assy Note ZZ5 GP1500-0.020-00-0816 Bergquist GP1500-0.020-00- Bergquist
0404
H10 1 Adhesive, Thermally Conductive Silicone See Assy Note ZZ6 SA-1000 Bergquist - -
H13, H15, H18, H21 4 Nut #4-40 Hex Nylon 4-40 NY HN 440 B&F Fastener - -
Supply
H14, H16, H19, H22 4 Screw, steel zinc, flathead 4-40 machine, 0.250" 4-40 x 1/4" Any Any - -
J1, J3 2 Header, 100mil, 2x1, Tin, TH Header, 2 PIN, 100mil, Tin PEC02SAAN Sullins Connector
Solutions
J2 1 Receptacle, Micro-USB-B, Right Angle, SMD Micro USB receptacle 105017-0001 Molex
J4 1 Header (friction lock), 100mil, 4x1, R/A, TH 4x1 R/A Header 22-05-3041 Molex
J5 1 Header (shrouded), 100 mil, 7x2, Gold plated, TH 7x2 Shrouded Header SBH11-PBPC-D07-ST-BK Sullins Connector
Solutions
L1 1 6.3uH Inductor, 6.3 µH, 13 A, 0.017 ohm, TH TH, Dia 53mm, Pin spacing 760308111 Wurth Elektronik
14.2mm
(1) Unless otherwise noted in the Alternate Part Number and/or Alternate Manufacturer columns, all parts may be substituted with equivalents.
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Table 2. Bill of Materials(1) (continued)
Designator Qty Value Description Package Reference Part Number Manufacturer Alternate Part Alternate
Number Manufacturer
NTC1 1 10.0k ohm Thermistor NTC, 10.0k ohm, 1%, 0603 0603 NTCG163JF103F TDK
R1 1 113k RES, 113 k, 0.1%, 0.1 W, 0603 0603 RG1608P-1133-B-T5 Susumu Co Ltd
R2 1 7.50k RES, 7.50 k, 0.1%, 0.1 W, 0603 0603 RT0603BRD077K5L Yageo America
R3, R5 2 0 RES, 0 ohm, 5%, 0.25W, 1206 1206 CRCW12060000Z0EA Vishay-Dale
R4, R9, R17, R19 4 1.00k RES, 1.00 k, 1%, 0.1 W, 0603 0603 CRCW06031K00FKEA Vishay-Dale
R6 1 69.8k RES, 69.8k ohm, 1%, 0.1W, 0603 0603 RC0603FR-0769K8L Yageo America
R7, R12, R20, R24, R28 5 10.0k RES, 10.0k ohm, 1%, 0.1W, 0603 0603 RC0603FR-0710KL Yageo America
R8, R16 2 0.2 RES, 0.2 ohm, 5%, 0.25W, 0805 0805 ERJ-S6SJR20V Panasonic
R10 1 499k RES, 499k ohm, 1%, 0.1W, 0603 0603 RC0603FR-07499KL Yageo America
R11 1 2.00 RES, 2.00, 1%, 0.1 W, 0603 0603 CRCW06032R00FKEA Vishay-Dale
R13 1 76.8k RES, 76.8 k, 0.1%, 0.1 W, 0603 0603 RG1608P-7682-B-T5 Susumu Co Ltd
R14 1 10.0k RES, 10.0 k, 0.1%, 0.1 W, 0603 0603 RT0603BRD0710KL Yageo America
R15 1 47k RES, 47k ohm, 5%, 0.1W, 0603 0603 RC0603JR-0747KL Yageo America
R18 1 0.02 RES, 0.02, 0.5%, 0.5 W, 1206 sense 1206 sense LVK12R020DER Ohmite
R21, R22, R27 3 100k RES, 100 k, 1%, 0.1 W, 0603 0603 RC0603FR-07100KL Yageo America
R23 1 200k RES, 200 k, 1%, 0.1 W, 0603 0603 RC0603FR-07200KL Yageo America
R25 1 24.9k RES, 24.9 k, 1%, 0.1 W, 0603 0603 RC0603FR-0724K9L Yageo America
R26 1 80.6k RES, 80.6 k, 1%, 0.1 W, 0603 0603 RC0603FR-0780K6L Yageo America
TP3 1 Red Test Point, Compact, Red, TH Red Compact Testpoint 5005 Keystone
TP4, TP7, TP8, TP9, TP10, 7 Black Test Point, Multipurpose, Black, TH Black Multipurpose 5011 Keystone
TP11, TP17 Testpoint
TP16 1 White Test Point, Compact, White, TH White Compact Testpoint 5007 Keystone
U1 1 BQ500511RHA, RHA0040A RHA0040A bq500511 Texas Instruments BQ500511RHAT Texas Instruments
U2 1 4.2V to 5.5V Input, 3A Full Bridge, 2 Channel Analog RHB0032E bq50002 Texas Instruments None
Demodulation Wireless Power TX-Driver for Wireless
Charging Applications, RHB0032E
C28 0 0.1uF CAP, CERM, 0.1uF, 25V, +/-10%, X7R, 0603 0603 C1608X7R1E104K TDK
FID1, FID2, FID3 0 Fiducial mark. There is nothing to buy or mount. Fiducial N/A N/A
L2 0 Coupled inductor, 2.5 A, 0.034 ohm, SMD SMD, 5x5mm DLW5BTM102TQ2K MuRata
R29, R30, R31, R32, R33 0 10.0k RES, 10.0k ohm, 1%, 0.1W, 0603 0603 RC0603FR-0710KL Yageo America
TP49, TP52, TP55 0 White Test Point, Miniature, White, TH White Miniature Testpoint 5002 Keystone
TP51, TP54, TP57 0 Black Test Point, Multipurpose, Black, TH Black Multipurpose 5011 Keystone
Testpoint
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6 Test Setup
6.1 Equipment
6.1.1 bqTESLA™ Receiver
Use the bq51013B-764 (HPA764) or bq51020EVM-520, a low-power Qi-compliant receiver.
6.1.2 Voltage Source
The input voltage source must provide a regulated DC voltage of 5 V and deliver at least 2.0-A continuous
load current; current limit must be set to 2 A.
CAUTION
To help assure safety integrity of the system and minimize risk of electrical
shock hazard, always use a power supply providing suitable isolation and
supplemental insulation (double insulated). Compliance to IEC 61010-1, Safety
Requirements for Electrical Equipment for Measurement, Control and
Laboratory Use, Part 1, General Requirements, or its equivalent is strongly
suggested, including any required regional regulatory compliance certification
approvals. Always select a power source that is suitably rated for use with this
EVM as referenced in this user manual.
External Power Supply Requirements:
Nom Voltage: 5.0 VDC
Max Current: 2.0 A
Efficiency Level V
External Power Supply Regulatory Compliance Certifications: Recommend
selection and use of an external power supply which meets TI’s required
minimum electrical ratings in addition to complying with applicable regional
product regulatory/safety certification requirements such as (by example) UL,
CSA, VDE, CCC, PSE, and so forth.
6.1.3 Meters
Monitor the output voltage at the bq51013BEVM-764 test point TP7 with a voltmeter. Monitor the input
current into the load with an appropriate ammeter. You can also monitor the transmitter input current and
voltage, but the meter must use the averaging function for reducing error, due to communications packets.
6.1.4 Loads
A resistive load box that can be set to 10 kΩ, 10 Ω, and 5 Ω, power rating of at least 5 W; or an electronic
load that can be set to 0 mA, 500 mA and 1.0 A at 5 V.
6.1.5 Oscilloscope
Use a dual-channel oscilloscope with appropriate probes to observe the RECT signal at bq51013BEVM-
764 TP3 and other signals.
6.1.6 Recommended Wire Gauge
For proper operation, use 22-AWG wire when connecting the EVM to the input supply and the
bq51013BEVM-764 to the load.
6.1.7 EV2400 Communication Kit
EV2400-USB-Based PC Interface Kit.
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Test Setup www.ti.com
6.1.8 Software
BQSTUDIO Battery Management Studio Software.
6.2 Equipment Setup
The following sections describe the steps for setting up the equipment.
6.2.1 PWR607 Input Supply
Set the input supply voltage to 5.0 V and current limit to 2.0 A before connecting to the UUT. Turn power
supply off.
The input power supply positive lead is connected to J1. The power supply return lead is connected to J2
GND.
6.2.2 Oscilloscopes With Current Probe
Connect current probe to measure input current on positive power lead.
6.2.3 HPA764 Load
The load is connected between J3 OUT and J4 GND of the RX. Set the load resistance to 10-kΩor 0 mA.
6.2.4 Jumper Settings
Unit Under Test, PWR607-No jumper installed.
bqTesla Receiver
• HPA764-JP1 →EN1 and LOW shorted
• HPA764-JP2 →EN2 and LOW shorted
• HPA764-JP3 →TS and DIS shorted
• HAP764-JP6 →ILIM and FIX shorted
• HPA764 →R3 set to 0, full CCW
6.2.5 Meters
Connect ammeter to measure UUT input current from power supply. Connect voltmeter to UUT and
monitor input voltage at J1.
HPA764 connect voltmeter to monitor output voltage at TP7 and voltmeter to measure unregulated voltage
at TP12. HPA764 connect current meter to monitor output current to load.
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To Computer
USB Port
4-Pin Cable
to EVM
www.ti.com Test Setup
6.2.6 EV2400 Set Up
Connect J4 to EV2400 kit by 4-pin cable. Connect the USB port of the EV2400 kit to the USB port of the
computer. The connections are shown in Figure 2.
Figure 2. Connections of the EV2400 kit
6.2.7 Connector
A USB mini cable with red (+) and black (–) banana plugs and green/white wires shorted together. Note
red lead will connect to pin 1 and black lead will connect to pin 5. Test cable should be 6- to 12-in long.
6.3 EVM Procedure
6.3.1 Set Input Voltage
Verify that the power supply is adjusted and connected according to Section 6.1.2. Verify that the jumper
settings are completed according to Section 6.2.4.
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Test Setup www.ti.com
6.3.2 bqStudio
Turn on the input power supply, verify the input voltage at J1 is 4.9 V to 5.1 V and the current is less than
100 mA. Turn on the computer and open the bq50002 evaluation software. Select “Charger” and click
next. Select charger_1_00_bq50002.bqz and click finish. The main window of the software is shown in
Figure 3.
Figure 3. bqStudio Window
Place your mouse on the Device Version Value cell, the device version should be “0.1.2.2745”, as shown
in Figure 3.
Figure 4. Device ID
Turn off power supply. And disconnect the EV2400 box from the EVM and the computer.
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www.ti.com Test Setup
6.3.3 Start-Up No Receiver
Do not place any receiver on PWR607 for this test.
Turn on power supply and observe that:
1. Input voltage at J1 is 4.9 V to 5.1 V and current is less than 100 mA with a high-to-low fluctuation or
toggling.
2. On UUT PWR607, Power On green LED D1 is ON
3. On UUT PWR607 LED D4, D5 and D6 are OFF
4. Using current probe, monitor input current and observe digital pin will occur every 5 s for 70
ms.
6.3.4 Receiver In Place – No Load
Place HPA764 on PWR607 above the TX Coil, load should be set to 10 kΩor 0 mA.
Observe that:
1. On HPA764, LED D1 is ON
2. On HPA764, voltage at TP7 should be 4.9 V to 5.1 V
3. On HPA764, voltage at TP12 should be 7.0 V to 7.5 V, voltage will fluctuate.
4. On UUT PWR607 during power transfer (HPA764 D1 ON):
(a) LED D6, flashing Green
(b) Input current should be less than 300 mA
6.3.5 Receiver In Place – 1.0-A Load
With the HPA764 in place on the PWR607, above TX Coil set output load current to 950 mA to 1050 mA.
Input voltage at UUT J1 should be 4.9 V to 5.1 V, adjust input supply if necessary.
Observe that:
1. On HPA764 LED D1 is ON
2. On HPA764, voltage at TP7 should be 4.9 V to 5.1 V
3. On HPA764, voltage at TP12 should be 5.1 V to 5.3 V
4. On UUT, PWR607 LED D6 Flashing Green
5. On UUT, PWR607 input current should be less than 1700 mA
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Power (W)
Efficiency
0 1 2 3 4 5 6
0.00
10.00%
20.00%
30.00%
40.00%
50.00%
60.00%
70.00%
80.00%
D001
Test Setup www.ti.com
6.3.6 Efficiency
Measure the system efficiency by measuring the output voltage, output current, input voltage, and input
current and calculate efficiency as the ratio of the output power to the input power. Connect voltage
meters at the input and output of TX and RX. Average the input current; the comm pulses modulate the
input current, distorting the reading. Figure 5 shows efficiency.
Figure 5. Efficiency vs Power, bq50002EVM-607 TX and bq51013BEVM-764 Receiver
6.3.7 Start Up Receiver Placed on Transmitter
The transmitter will send an analog ping about every 400 ms. If a receiver is present, it will power up and
reply then begin power transfer. Figure 6 is a scope capture of the bq50002 EVM beginning a power
transfer with the bq51013B EVM.
Figure 6. Start Up
6.3.8 TS Fault
With HPA764 and PWR607 operating in the configuration from Section 6.3.5, on the EVM HPA764, adjust
R3 to 0 Ω. Next, move the TS Jumper JP3 from TS-DS to TS-EN. UUT PWR607 Red fault LED, D5
should light.
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www.ti.com Test Setup
6.3.9 Foreign Object Detection (FOD)
The bq50002 EVM supports FOD in order to meet the requirements of the WPC V1.2 specification.
Continuously monitoring input power, known losses, and the value of power reported by the receiver
device being charged, the bq500511 can estimate how much power is unaccounted for and presumed lost
due to metal objects placed in the wireless power transfer path. If this unexpected loss exceeds the
threshold set by the FOD resistors, a fault is indicated and power transfer is halted.
Three key measurements for the TX FOD calculation:
•Input Power – Product of input voltage and current. Input voltage is measured at BQ500511 pin 9
though R13 and R14. Input current is measured using sense resistor R18 at BQ50002 pin 29 and 30.
Both measurements must be very accurate.
•Power Loss in Transmitter – This is an internal calculation based on the operating point of the
transmitter. The calculation is adjusted using FOD_CAL resistor, R26. This calculation changes with
external component changes in the power path such as resonant capacitors and TX coil. Recalculation
of R26 and R27 is required.
•Receiver Reported Power – The receiver calculates and reports power it receives in the message
packet Received Power Packet.
The FOD threshold on the EVM is set to 400 mW when R27 is set to 100 kΩ. Increasing R27 increases
the threshold and reduces the sensitivity to foreign objects. This loss threshold is determined after making
a measurement of transmitter performance using a FOD calibration receiver similar to a unit manufactured
by Avid®Technology. Contact Texas Instruments for the FOD calibration procedure for the bq50002.
6.3.10 Thermal Performance
This section shows a thermal image of the bq50002EVM-607. A 1000-mA load is used at the receiver
output, bq51013BEVM-764. Output power is approximately 5 W, 1 A at 5 V. The highest temperature point
in Figure 7 is 35.6°C
Figure 7. Thermal Performance
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bq50002EVM-607 Assembly Drawings and Layout www.ti.com
7 bq50002EVM-607 Assembly Drawings and Layout
Figure 8 through Figure 11 show the design of the bq50002EVM PCB. The EVM has been designed using
a 4-layer, 2-oz, copper-clad circuit board, 13.2 cm × 7.24 cm with all components in a 4.0-cm x 5.0-cm
active area on the top side and all active traces on the top and bottom layers to allow the user to easily
view, probe, and evaluate bq50002 analog frontend IC and bq500511 control IC in a practical application.
Moving components to both sides of the PCB or using additional internal layers offers additional size
reduction for space-constrained systems. Gerber files are available for download from the EVM product
folder (bq50002EVM-607).
A 4-layer PCB design is recommended to provide a good low-noise ground plane for all circuits. A 2-layer
PCB presents a high risk of poor performance. Grounding between the bq50002 GND pins and filter
capacitor returns should be a good low-impedance path.
Coil Grounding – A ground plane area under the coil is recommended to reduce noise coupling into the
receiver. The ground plane for the EVM is slightly larger than the coil footprint and grounded at one point
back to the circuit area.
Note: The clear plastic cover thickness (0.93 in or 2.4 mm) is the z-gap thickness for the transmitter.
Figure 8. Assembly Top
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www.ti.com bq50002EVM-607 Assembly Drawings and Layout
Figure 9. Inner Layer 1
Figure 10. Inner Layer 2
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Reference www.ti.com
Figure 11. Bottom Layer
8 Reference
For additional information about the bq50002EVM-607 low-power, wireless, power evaluation kit from
Texas Instruments, visit the product folder on the TI Web site at http://www.ti.com/product/bq50002
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