• State
  • Locked Locked
  • Replies 5 replies
  • Subscribers 63 subscribers
  • Views 1218 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.

BQ24171: BQ24171

leonid rit
Prodigy 30 points
Part Number: BQ24171

Hi

is it possible to disable an 8-mA discharge current applied to the SRN pin.

the problem that there isn't system load the charger always discharge battery ( i see 8-mA discharge current). battery present 

thanks in advance

Leonid

  • 0
    TI__Guru 56650 points

    bq24171 cannot block that 8mA by itself. We may have to add a diode between the battery and the charger sense resistor. But, that may affect the battery detection routine.

  • 0 in reply to Wang5577
    Prodigy 30 points

    thanks Wang

    does it means that it decrease charge voltage by diode ? in the case i need increase FB voltage (change FB divide resistor)  and to take attention regarding power dissipation on this diode in charging time ?

    8ma discharge is to big. in our case discharge battery after 1 week

    Regards

    Leonid

  • 0 in reply to leonid rit
    TI__Guru 56650 points

    8mA is discharged from SRP/SRN pin. You can put the voltage feedback resistor divider after the series diode. So, you don't need worry about the voltage drop in that diode. But, the battery detection function will be affected. So, if you have an EVM, please try it to make sure everything OK for your application.

  • 0 in reply to Wang5577
    Prodigy 30 points
    Hi
    i check this solution on EVM and it doesn't work. discharge is present in case diode or even i disconnect SRN pin (discharge jump between 4-12mA). think bq24171 can't detect that battery connected and don't place itself in sleep mode.
    What does means on datasheet "Less Than 15-μA Battery Current With Adapter
    Removed" ? according battery detection routine it always 8mA discharged, even when i disconnect the adapter. is there any way to stop 8mA discharge in case battery always connected? can you recommend other P/N where can we stop battery discharge in case adapter has been removed?
  • 0 in reply to leonid rit
    TI__Guru 56650 points
    If the diode is in series with the battery, where is the discharge current comes from? Your concern is the battery discharger current. I don't understand why the charger can still discharge the battery. How do you measure the discharge current?