• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 1393 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ24773: BQ24773 Battery charging voltage at Continuous Load ON

Rahul Surawase48
Expert 2395 points
Part Number: BQ24773
Other Parts Discussed in Thread: TPS61088,

Hello TI, 

               We stuck in one issue, what is charging voltage in continuous load on 


1. 5V/5A Input adapter
2.We use 1S Lithium Polymer battery pack of 5000mAh capacity (as per the manufacturer, charging voltage 4.2V and output voltage is 3.7V)
3. Continuous output Load is 5V/4A (Boost converter TPS61088 Between charger and Load )

In above state what is my battery charging time ...?

1.what is charging voltage ...?
2.what is charging current ..?
3.System output voltage ..?
4. System output current ..?

find the attachment for system block diagram 

Thanks and regards,
Rahul surawase 

  • 0
    TI__Mastermind 25800 points

    Hey Rahul,

    As far as charging voltage, that should be set to 4.2V per your battery specification of max of 4.2V. 

    You have outlined all of the system parameters yourself in the block diagram. The system load is 5V, 4A, assuming the boost converter can handle that amount of power. 

    The charging current is set by you, but because your system load is 20W, and your input power capability is only 25W, when you account for efficiency of both the BQ24773 and the TPS61088, there may only be around 4W left of charging (assuming 1W of loss, which is a conservative number). 

    Once you estimate the efficiency of the total system, you can estimate the input current/power available for charging, and from there, estimate the charging current. With the charging current, you can approximate the charging time by 5000mAh x 1.3 factor / charge current.

    Regards,

    Joel H