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Question for 　BQ51025EVM　change to 10V output

March Jasper
Expert 2340 points
Other Parts Discussed in Thread: BQ51025, BQ24171

Hi  

Now we used to BQ51025 EVM and will change to 10V output  voltage.

We change to some resister on Schematic of EVM.

VIREG    Setting   = R12   10Kohm  ->   6.8K ohm  

VOREG  Setting  =  R10   10Kohm  ->   6.8Kohm 

But we connected to   Load  from  BQ51025 EVM output.

Vout output is not stable.

* TX EVM  input is  12V　

【　Question　】

　　Dose we need something change for  Resister setting on BQ51025 EVM ?

　　Dose we need something change for Resister setting  on TX side ??

March Jasper   ( Japan Disty  Sugimoto ) 

  • 0
    TI__Expert 7730 points

    Jasper,

    Can you describe how did the Vout behave? Did it ever get to 10V? Is there any load at your OUT?

    You resistor change seem correct and you shouldn't need to change anything on TX side.

    Thanks,

    Wenjia

  • 0 in reply to Wenjia Liu
    TI__Expert 7730 points
    Jasper,

    Disabling FOD on TX side may help. You just need to remove the jumper of J1 on TX and then power cycle the system.

    Thanks,
    Wenjia
  • 0 in reply to Wenjia Liu
    Expert 2340 points

    Hi Wenjia 

    Thank you very much.

    We understood about this one. I will try with customer about this one.

    Thanks and Regard

    Jasper    ( Japan Disty  Sugimoto )

  • 0 in reply to Wenjia Liu
    Expert 2340 points

    Hi  Wenjia 

    Thank you very much  many help.

    I have one question for  BQ51025 Data sheet for  10V /1 A   setting.

    We found BQ51025 Data sheet page 34 and this Fig 32.

    >A typical coil inductance for 10-V is between 15 and 17 μH. It is important to note that even if the same receiver
    >coil and tuning as for a 7-V RX solution are used (see Receiver Coil and Series and Parallel Resonant
    >Capacitors), the RFOD and ROS values need to be updated to accurately determine the received power.

    【　Question　】

    　Dose we need change  RFOD and ROS Value with 10V output setting for BQ 51025 RX EVM?? 

      Now we thinking  this  Block Diagram .

        BQ51025 EVM  ( 10V Out Put / 1A )   --- >   BQ24171 EVM  ( 2  cell Setting ) 

     Can we tell us  RFOD and ROS  setting value for BQ51025 (1 0W=10V /  1A)   EVM??

     Thanks and Regard

     Jasper   ( Japan Distyt Sugimoto )