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BQ50002A: Transmitter Circuit Design Support

Deniz Sinoplu
Prodigy 40 points
Part Number: BQ50002A
Other Parts Discussed in Thread: BQ500511A, , BQ51013B

Hi TE2E Community,

I am trying to develop a Wireless Charging Transmitter and designing a charging dock by using bq50002A & bq500511A combination. I followed the application note shared on product page as much as possible. I am using WE760308101103 receiver coil with bq51013B Wireless receiver component and WE760308101111E transmitter coils in my design. When coils are placed in the range of 0mm to 6-7mm, transmitter circuit's green led blinking which means according to LED Mode 1 power transfer. Unfortunately, there is no power transfer detected on the receiver end and the coltage on transmitter coild is barely hitting 1V level. I don't understand what can cause this matter. It cannot be distance because I am also placing both coils on top of each other and it is the same result. I am attaching my Sketch and Bom for my transmitter design. Can somebody give me an opinion where the problem would be causing from ? Thanks.

Charging PCB.txt 
Partlist exported from R:/KUNDEN/BEIERSDORF/2019 - On Air 2.0/03 Prototyping/03 Data/06 Electronic Development/EAGLE CAD/projects/BDF - On Air 2.0 - Charging PCB/BDF - On Air 2.0 - Charging PCB_ALT2/BDF - On Air 2.0 - Charging PCB_ALT2.sch at 10/03/2020 12:55

Qty Value           Device                        Package                 Parts                                   Description                                                                                                                                         DATASHEET-URL                                                DESCRIPTION                                                                                                                                         FRES1 HEIGHT IR1 ISAT1 MANUFACTURER_NAME                 MANUFACTURER_PART_NUMBER MOUSER_PART_NUMBER   MOUSER_PRICE-STOCK                                                     PART-NUMBER  POPULARITY Q1    RDC-MAX1 RDC-TYP1 VALUE
1                   PINHD-1X3                     1X03                    JP2                                     PIN HEADER                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      92                                      
1   0.022uF 50v     C1608X7R1H223K080AA           CAPC1608X80N            C12                                     0603 X7R ceramic capacitor 50V 22nF TDK C1608 C 22nF Ceramic Multilayer Capacitor, 50 V dc, +125C, X7R Dielectric, +/-10% SMD                                                                                    0603 X7R ceramic capacitor 50V 22nF TDK C1608 C 22nF Ceramic Multilayer Capacitor, 50 V dc, +125C, X7R Dielectric, +/-10% SMD                             0.8mm            TDK                               C1608X7R1H223K080AA      810-C1608X7R1H223K   https://www.mouser.com/Search/Refine.aspx?Keyword=810-C1608X7R1H223K                                                        
1   0.02ohm         LVK12R020DER                  LVK1206_1               R18                                     Resistor 0.020R 0.5% 0.5W 4 Terminal Ohmite LVK12 Series Metal Alloy Current Sensing Surface Mount Resistor 0.5% 0.5W  /-50ppm/degC                                                                              Resistor 0.020R 0.5% 0.5W 4 Terminal Ohmite LVK12 Series Metal Alloy Current Sensing Surface Mount Resistor 0.5% 0.5W  /-50ppm/degC                       mm               Ohmite                            LVK12R020DER             588-LVK12R020DER     https://www.mouser.com/Search/Refine.aspx?Keyword=588-LVK12R020DER                                                          
2   0.047uF 10V     C1608X7R1H473K080AA           CAPC1608X80N            C10, C18                                TDK C1608 C 47nF Ceramic Multilayer Capacitor, 50 V dc, +125C, X7R Dielectric, +/-10% SMD                                                                                                                        TDK C1608 C 47nF Ceramic Multilayer Capacitor, 50 V dc, +125C, X7R Dielectric, +/-10% SMD                                                                 0.8mm            TDK                               C1608X7R1H473K080AA      810-C1608X7R1H473K   https://www.mouser.com/Search/Refine.aspx?Keyword=810-C1608X7R1H473K                                                        
4   0.1uF 100V      C3216C0G2A104J160AC           CAPC3216X180N           C14, C16, C17, C19                      MLCC - SMD/SMT 1206 0.1uF 100volts C0G +/-5% 1.60mm                                                                                                                                                              MLCC - SMD/SMT 1206 0.1uF 100volts C0G +/-5% 1.60mm                                                                                                       1.8mm            TDK                               C3216C0G2A104J160AC      810-C3216C0G2A104J6C https://www.mouser.com/Search/Refine.aspx?Keyword=810-C3216C0G2A104J6C                                                      
9   0.1uF 25V       06033C104KAT4A                CAPC1608X90N            C2, C5, C7, C8, C11, C20, C22, C23, C24 Multilayer Ceramic Capacitors MLCC - SMD/SMT 25volts 0.1uF 10% X7R                                                                                                                                               Multilayer Ceramic Capacitors MLCC - SMD/SMT 25volts 0.1uF 10% X7R                                                                                        0.9mm            AVX                               06033C104KAT4A           581-06033C104KAT4A   https://www.mouser.com/Search/Refine.aspx?Keyword=581-06033C104KAT4A                                                        
2   0.2ohm          CRL0805-JW-R200ELF            RESC2012X60N            R8, R16                                 Current Sense Resistors - SMD 0.2ohm 5%                                                                                                                                                                          Current Sense Resistors - SMD 0.2ohm 5%                                                                                                                   0.6mm            Bourns                            CRL0805-JW-R200ELF       652-CRL0805JWR200ELF https://www.mouser.com/Search/Refine.aspx?Keyword=652-CRL0805JWR200ELF                                                      
1   0.47uF 10V      GRM188R71A474KA61D            CAPC1608X90N            C25                                     Ceramic  SMT capacitor 470nF 10Vdc Murata 0603 GRM 470nF Ceramic Multilayer Capacitor, 10 V dc X7R Dielectric +/-10%                                                                                             Ceramic  SMT capacitor 470nF 10Vdc Murata 0603 GRM 470nF Ceramic Multilayer Capacitor, 10 V dc X7R Dielectric +/-10%                                      0.9mm            Murata Electronics                GRM188R71A474KA61D       81-GRM188R71A474KA1D https://www.mouser.com/Search/Refine.aspx?Keyword=81-GRM188R71A474KA1D                                                      
1   1000pF 50V      CGA3E2C0G1H102J080AD          CAPC1608X90N            C9                                      Multilayer Ceramic Capacitors MLCC - SMD/SMT 0603 50V 1000pF C0G No Solder-Glue Only                                                                                                                             Multilayer Ceramic Capacitors MLCC - SMD/SMT 0603 50V 1000pF C0G No Solder-Glue Only                                                                      0.9mm            TDK                               CGA3E2C0G1H102J080AD     810-C1608C0G1H102JEP https://www.mouser.com/Search/Refine.aspx?Keyword=810-C1608C0G1H102JEP                                                      
3   100kOhm         CRCW0402100KFKED              RESC1005X40N            R15, R21, R22                           CRCW0402 Resistor T/R 0.063W,1%,100K Vishay CRCW Series Thick Film Surface Mount Resistor 0402 Case 100k +/-1% 0.063W +/-100ppm/C                                                                                CRCW0402 Resistor T/R 0.063W,1%,100K Vishay CRCW Series Thick Film Surface Mount Resistor 0402 Case 100k +/-1% 0.063W +/-100ppm/C                         0.4mm            Vishay                            CRCW0402100KFKED         71-CRCW0402-100K-E3  https://www.mouser.com/Search/Refine.aspx?Keyword=71-CRCW0402-100K-E3                                                       
2   100v, 0.2A      MMDL914-TP                    SOD2512X115N            D2, D3                                  Diodes - General Purpose, Power, Switching 100V 200mA 4pF                                                                                                                                                        Diodes - General Purpose, Power, Switching 100V 200mA 4pF                                                                                                 1.15mm           Micro Commercial Components (MCC) MMDL914-TP               833-MMDL914          https://www.mouser.com/Search/Refine.aspx?Keyword=833-MMDL914                                                               
6   10kOhm          CRCW040210K0FKED              RESC1005X40N            R7, R12, R20, R24, R25, R26             CRCW0402 Resistor T/R 0.063W,1%,10K Vishay CRCW Series Thick Film Surface Mount Resistor 0402 Case 10k +/-1% 0.063W +/-100ppm/C                                                                                  CRCW0402 Resistor T/R 0.063W,1%,10K Vishay CRCW Series Thick Film Surface Mount Resistor 0402 Case 10k +/-1% 0.063W +/-100ppm/C                           0.4mm            Vishay                            CRCW040210K0FKED         71-CRCW0402-10K-E3   https://www.mouser.com/Search/Refine.aspx?Keyword=71-CRCW0402-10K-E3                                                        
1   10kOhm          MCS0402PD1002DE500            RESC1005X37N            R14                                     Thin Film Resistors - SMD .200W 10Kohms .5% 0402 25ppm Hi Power                                                                                                                                                  Thin Film Resistors - SMD .200W 10Kohms .5% 0402 25ppm Hi Power                                                                                           0.37mm           Vishay                            MCS0402PD1002DE500       594-MCS0402PD1002DP5 https://www.mouser.com/Search/Refine.aspx?Keyword=594-MCS0402PD1002DP5                                                      
1   113kOhm         ERJ-2RKF1133X                 RESC1005X40N            R1                                      Thick Film Resistors - SMD 0402 113Kohms 1% AEC-Q200                                                                                                                                                             Thick Film Resistors - SMD 0402 113Kohms 1% AEC-Q200                                                                                                      0.4mm            Panasonic                         ERJ-2RKF1133X            667-ERJ-2RKF1133X    https://www.mouser.com/Search/Refine.aspx?Keyword=667-ERJ-2RKF1133X                                                         
4   1kOhm           CRCW04021K00FKED              RESC1005X40N            R4, R9, R17, R19                        CRCW0402 Resistor T/R 0.063W,1%,1K Vishay CRCW Series Thick Film Surface Mount Resistor 0402 Case 1kOhm  /-1% 0.063W  /-100ppm/degC                                                                              CRCW0402 Resistor T/R 0.063W,1%,1K Vishay CRCW Series Thick Film Surface Mount Resistor 0402 Case 1kOhm  /-1% 0.063W  /-100ppm/degC                       0.4mm            Vishay                            CRCW04021K00FKED         71-CRCW0402-1.0K-E3  https://www.mouser.com/Search/Refine.aspx?Keyword=71-CRCW0402-1.0K-E3                                                       
1   2.2uF 10V       GRM188R71A225KE15D            CAPC1608X90N            C3                                      Ceramic  SMT capacitor 2.2uF 10Vdc Murata 0603 GRM 2.2??F Ceramic Multilayer Capacitor, 10 V dc, +125??C, X7R Dielectric, ??10%                                                                                  Ceramic  SMT capacitor 2.2uF 10Vdc Murata 0603 GRM 2.2??F Ceramic Multilayer Capacitor, 10 V dc, +125??C, X7R Dielectric, ??10%                           0.9mm            Murata Electronics                GRM188R71A225KE15D       81-GRM188R71A225KE15 https://www.mouser.com/Search/Refine.aspx?Keyword=81-GRM188R71A225KE15                                                      
1   2.2uF 16V       EMK107BJ225KA-T               CAPC1608X50N            C21                                     Multilayer Ceramic Capacitors MLCC - SMD/SMT 2.2uF 16V X5R +/-10% 0603 Gen Purp                                                                                                                                  Multilayer Ceramic Capacitors MLCC - SMD/SMT 2.2uF 16V X5R +/-10% 0603 Gen Purp                                                                           0.5mm            TAIYO YUDEN                       EMK107BJ225KA-T          963-EMK107BJ225KA-T  https://www.mouser.com/Search/Refine.aspx?Keyword=963-EMK107BJ225KA-T                                                       
1   200kOhm         CRCW0402200KFKED              RESC1005X40N            R23                                     CRCW0402 Resistor T/R 0.063W,1%,200K Vishay CRCW Series Thick Film Surface Mount Resistor 402 Case 200k?? ??1% 0.063W ??100ppm/??C                                                                               CRCW0402 Resistor T/R 0.063W,1%,200K Vishay CRCW Series Thick Film Surface Mount Resistor 402 Case 200k?? ??1% 0.063W ??100ppm/??C                        0.4mm            Vishay                            CRCW0402200KFKED         71-CRCW0402-200K-E3  https://www.mouser.com/Search/Refine.aspx?Keyword=71-CRCW0402-200K-E3                                                       
1   2200pF 50V      C0603C222K5RACAUTO            CAPC1608X87N            C13                                     KEMET C0603C222K5RACAUTO 2.2nF MLCC 50V dc +/-10% Tolerance SMD                                                                                                                                                  KEMET C0603C222K5RACAUTO 2.2nF MLCC 50V dc +/-10% Tolerance SMD                                                                                           0.87mm           Kemet                             C0603C222K5RACAUTO       80-C0603C222K5RAUTO  https://www.mouser.com/Search/Refine.aspx?Keyword=80-C0603C222K5RAUTO                                                       
3   22uF 25V        GRM21BR61E226ME44K            CAPC2012X145N           C1, C4, C6                              Multilayer Ceramic Capacitors MLCC - SMD/SMT                                                                                                                                                                     Multilayer Ceramic Capacitors MLCC - SMD/SMT                                                                                                              1.45mm           Murata Electronics                GRM21BR61E226ME44K       81-GRM21BR61E226ME4K https://www.mouser.com/Search/Refine.aspx?Keyword=81-GRM21BR61E226ME4K                                                      
1   24.9kOhm        CRCW040224K9FKED              RESC1005X40N            R3                                      Vishay CRCW Series Thick Film Surface Mount Resistor 0402 Case 24.9k +/-1% 0.063W +/-100ppm/C                                                                                                                    Vishay CRCW Series Thick Film Surface Mount Resistor 0402 Case 24.9k +/-1% 0.063W +/-100ppm/C                                                             0.4mm            Vishay                            CRCW040224K9FKED         71-CRCW0402-24.9K-E3 https://www.mouser.com/Search/Refine.aspx?Keyword=71-CRCW0402-24.9K-E3                                                      
1   2700pF 50V      C1608C0G1H272J080AA           CAPC1608X80N            C15                                     TDK - C1608C0G1H272J080AA - CERAMIC CAPACITOR 2700PF 50V, C0G, 5%, 0603, FULL REEL                                                                                                                               TDK - C1608C0G1H272J080AA - CERAMIC CAPACITOR 2700PF 50V, C0G, 5%, 0603, FULL REEL                                                                        0.8mm            TDK                               C1608C0G1H272J080AA      810-C1608C0G1H272J   https://www.mouser.com/Search/Refine.aspx?Keyword=810-C1608C0G1H272J                                                        
1   2ohm            CRCW04022R00FKED              RESC1005X40N            R11                                     Vishay CRCW Series Thick Film Resistor 0402 Case 2 1% 0.063W +/-100ppm/K                                                                                                                                         Vishay CRCW Series Thick Film Resistor 0402 Case 2 1% 0.063W +/-100ppm/K                                                                                  0.4mm            Vishay                            CRCW04022R00FKED         71-CRCW0402-2-E3     https://www.mouser.com/Search/Refine.aspx?Keyword=71-CRCW0402-2-E3                                                          
1   499kOhm         CRCW0402499KFKED              RESC1005X40N            R10                                     RESISTOR, 0402 499K Ohms +/-1% 0.063W                                                                                                                                                                            RESISTOR, 0402 499K Ohms +/-1% 0.063W                                                                                                                     0.4mm            Vishay                            CRCW0402499KFKED         71-CRCW0402-499K-E3  https://www.mouser.com/Search/Refine.aspx?Keyword=71-CRCW0402-499K-E3                                                       
1   5V              MOUNT-PAD-ROUND2.8            2,8-PAD                 H4                                      MOUNTING PAD, round                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             6                                       
1   6.3uH           WE-WPCC_TX_1COIL_760308100111 WE-WPCC_TX_760308100111 WE760308100111                          WE-WPCC Wireless Power Transfer Transmitter Coil                                                                                                    https://katalog.we-online.com/pbs/datasheet/760308100111.pdf                                                                                                                                                     24MHz        6A  10A                                                                                                                                                          760308100111             120  48mOhm   40mOhm   6.3uH
1   69.8kOhm        CRCW040269K8FKED              RESC1005X40N            R6                                      Vishay CRCW Series Thick Film Resistor 0402 Case 69.8k 1% 0.063W +/-100ppm/K                                                                                                                                     Vishay CRCW Series Thick Film Resistor 0402 Case 69.8k 1% 0.063W +/-100ppm/K                                                                              0.4mm            Vishay                            CRCW040269K8FKED         71-CRCW0402-69.8K-E3 https://www.mouser.com/Search/Refine.aspx?Keyword=71-CRCW0402-69.8K-E3                                                      
1   7.5kOhm         ERA-2AEB752X                  RESC1005X40N            R2                                      Panasonic ERA Series Thin Film Surface Mount Resistor 0402 Case 7.5k +/-0.1% 63mW +/-25ppm/C                                                                                                                     Panasonic ERA Series Thin Film Surface Mount Resistor 0402 Case 7.5k +/-0.1% 63mW +/-25ppm/C                                                              0.4mm            Panasonic                         ERA-2AEB752X             667-ERA-2AEB752X     https://www.mouser.com/Search/Refine.aspx?Keyword=667-ERA-2AEB752X                                                          
1   76.8kOhm        ERA-2AEB7682X                 RESC1005X40N            R13                                     Thin Film Resistors - SMD 0402 76.8Kohm .1% AEC-Q200                                                                                                                                                             Thin Film Resistors - SMD 0402 76.8Kohm .1% AEC-Q200                                                                                                      0.4mm            Panasonic                         ERA-2AEB7682X            667-ERA-2AEB7682X    https://www.mouser.com/Search/Refine.aspx?Keyword=667-ERA-2AEB7682X                                                         
1   80.6kOhm        CRCW040280K6FKED              RESC1005X40N            R5                                      Vishay CRCW Series Thick Film Resistor 0402 Case 80.6k 1% 0.063W +/-100ppm/K                                                                                                                                     Vishay CRCW Series Thick Film Resistor 0402 Case 80.6k 1% 0.063W +/-100ppm/K                                                                              0.4mm            Vishay                            CRCW040280K6FKED         71-CRCW0402-80.6K-E3 https://www.mouser.com/Search/Refine.aspx?Keyword=71-CRCW0402-80.6K-E3                                                      
1   BQ50002ARHBR    BQ50002ARHBR                  QFN50P500X500X100-33N   IC1                                     Low-Cost 5-V Wireless Power Transmitter AFE WPC V 1.2 A11 Transmitter                                                                                                                                            Low-Cost 5-V Wireless Power Transmitter AFE WPC V 1.2 A11 Transmitter                                                                                     1mm              Texas Instruments                 BQ50002ARHBR             595-BQ50002ARHBR     https://www.mouser.com/Search/Refine.aspx?Keyword=595-BQ50002ARHBR                                                          
1   BQ500511ARHAR   BQ500511ARHAR                 QFN50P600X600X100-41N   IC2                                     Wireless Charging ICs Wireless Power Transmitter Controller 40-VQFN -40 to 85                                                                                                                                    Wireless Charging ICs Wireless Power Transmitter Controller 40-VQFN -40 to 85                                                                             1mm              Texas Instruments                 BQ500511ARHAR            595-BQ500511ARHAR    https://www.mouser.com/Search/Refine.aspx?Keyword=595-BQ500511ARHAR                                                         
1   GND             MOUNT-PAD-SQUARE2.8           2,8-PAD-SQUARE          H3                                      MOUNTING PAD, square                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            3                                       
2   Green           150060GS75000                 LEDC1608X80N            D1, D6                                  Wurth Elektronik WL-SMCW 520 nm Green LED, 1608 (0603) Clear SMD package                                                                                                                                         Wurth Elektronik WL-SMCW 520 nm Green LED, 1608 (0603) Clear SMD package                                                                                  0.8mm            Wurth Elektronik                  150060GS75000            710-150060GS75000    https://www.mouser.com/Search/Refine.aspx?Keyword=710-150060GS75000                                                         
1   NTCG163JF103FT1 NTCG163JF103FT1               THRMC1608X90N           RT1                                     NTC Thermistors THERMISTOR, NTC 10K OHM, 1%, 0603                                                                                                                                                                NTC Thermistors THERMISTOR, NTC 10K OHM, 1%, 0603                                                                                                         0.9mm            TDK                               NTCG163JF103FT1          810-NTCG163JF103FT1  https://www.mouser.com/Search/Refine.aspx?Keyword=810-NTCG163JF103FT1                                                       
1   Red             150060SS75000                 LEDC1608X80N            D5                                      LED,Wurth Elektronik,150060SS75000 Wurth Elektronik 150060SS75000, WL-SMCW Series Red LED, 630 nm, 1608 (0603) Clear, Rectangle Lens SMD Package                                                                 LED,Wurth Elektronik,150060SS75000 Wurth Elektronik 150060SS75000, WL-SMCW Series Red LED, 630 nm, 1608 (0603) Clear, Rectangle Lens SMD Package          0.8mm            Wurth Elektronik                  150060SS75000            710-150060SS75000    https://www.mouser.com/Search/Refine.aspx?Keyword=710-150060SS75000                                                         
1   Yellow          150060YS75000                 LEDC1608X80N            D4                                      LED,Wurth Elektronik,150060YS75000 Wurth Elektronik 150060YS75000, WL-SMCW Series Yellow LED, 590 nm, 1608 (0603) Clear, Rectangle Lens SMD Package                                                              LED,Wurth Elektronik,150060YS75000 Wurth Elektronik 150060YS75000, WL-SMCW Series Yellow LED, 590 nm, 1608 (0603) Clear, Rectangle Lens SMD Package       0.8mm            Wurth Elektronik                  150060YS75000            710-150060YS75000    https://www.mouser.com/Search/Refine.aspx?Keyword=710-150060YS75000

  • 0
    TI__Guru 67866 points

    Hello

    A couple of things to check:

    1.) BQ500511A pin 4 and 33, should be open.

    2.) Double check the RX coil P/N this looks like it may be a TX coil, L value is too low and will not have good performance.

  • 0 in reply to Bill Johns
    Prodigy 40 points

    Hi Bill, 

    I appreciate the fast response and the findings.

    You are right that pin 4 and 33 should be open. Pin 33 is just tagged but not used. But I am lost why I placed that resistor to the pin number 4. That is a weird mistake. Thanks for pointing that out. I hope this is the source of problem.

    About the 2nd item, I am in contact with Würth Elektronik and that receiver coil was their recommendation for our application due to dimension requirements and they approved its suitability as a receiver coil. Thanks for your insight about that too, I will try with a standard coil sample too. I will return to you after checking both of these items. 

  • 0 in reply to Bill Johns
    Prodigy 40 points

    Hi Bill,

    I have checked and removed resistors for both pins. They are both open but I still have the same issue. What else could be the reason for not having higher current flow in coils ?

  • 0 in reply to Deniz Sinoplu
    Prodigy 40 points

    P.S: I am using 1st LED Mode and Green LED is blinking, so with limited current values, DPL being activated is also an option. But I am checking my Input VDD is always 5.32V. There is no Voltage drop anytime. So I am not able to detect the problem. Do you have any ideas about this ?

  • 0 in reply to Deniz Sinoplu
    TI__Guru 67866 points

    Hello

    Coils

    1.) "WE760308101111E transmitter coils" -- could you double check the P/N cold not locate data sheet. Wurth does have 760308100111, good coil.

    2.) "WE760308101103 receiver coil" --- This is a 30mm round 6.3uH coil, OK for TX side but will not would well for RX.  The L value is too low.  For small coil needs to be 15uH or greater.

    DPL

    The input voltage is measured by R13 and R14 at the VSENSE pin-- Double check resistor values and voltage.

    Also check current sense resistor R18 connection and value.

    Disable FOD to prevent it from possibly causing problems, removed R15 to pull FOD_THR to 3V