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BQ24295EVM-549: BQ24295- Boost Mode

abhishek kr
Prodigy 20 points
Part Number: BQ24295EVM-549
Other Parts Discussed in Thread: BQ24295

Hi Everyone,

I am using BQ24295 for Power-bank application.

The issue is with Discharging through PMID.

I get the required voltage and current at PMID, But i am not able to discharge the Battery below 3.6V (Raw Voltage: Voltage @ battery Terminals).

As soon as the Battery Voltage drops to 3.6 volts the Q4 Gets high and disables the Boost-Operations

I have attached the registers settings done. Please help me to resolve the issue.

Fullscreen BATTERY.txt Download 
00   26
01   1B
02   20
03   10
04   BE
05   8C
06   73
07   4B
08   A4
09   00
0A   C0
10   FF
11   FF
12   FF
13   FF
14   FF
19   FF
1A   FF
1B   FF
1C   FF
1D   FF
1E   FF
1F   FF

  • 0
    TI__Mastermind 25800 points

    Hey abhishek,

    Have you checked the voltage at the BAT pin of the charger? How much current are you pulling from the battery?

    In terms of the register settings, when were these register values captured? According to what you sent, the charger is seeing an adapter present at VBUS. Are you applying voltage at VBUS in some way? 

    Do you have the register outputs immediately before and immediately after OTG turns off?

    Regards,

    Joel H

  • 0 in reply to Joel Hernandez II
    Prodigy 20 points
    The Voltage at PMID is 5.01 V. I am pulling 500mA from the PMID.
    Sorry About the register settings, The settings would be of charging.
    For Discharging I have unchecked the OTG-Low and enabled the OTG in the register settings.
    I donot see any faults at fault registers. But the boost stops at 3.5 (Battery Voltage), The BQ Turns the Q4 off Automatically.
  • 0 in reply to abhishek kr
    TI__Mastermind 25800 points
    Hey abhishek,

    Have you also disabled the watchdog timer? Does the OTG mode stop functioning after a specified time period?

    If you are able to take an oscilloscope capture of the following points, it would be very helpful:
    1) SW
    2) VBUS
    3) VBAT
    4) IBUS

    Attempt to trigger on the falling edge of VBUS as this would fall out of regulation once OTG turns off.


    Regards,
    Joel H