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The Pre -charging current setting for TWL6030B1A3CMRR

Arthur Huang
Expert 6065 points
Other Parts Discussed in Thread: TWL6030

Hi Team,

my customer used the TWL6030 device and they got a question about how to change the pre-charging current from default value of 470mA to 300mA to meet their application, so we need to check product team for advise.

Per the TWL6030 Battery Charging application note, that described " Fast precharging for 2.1 V < VBAT < 3.54 V (VBUS current is limited to 470 mA and battery charging current set to default charging current value when USB charging port is detected) "

So, customer's question how to change this default charging current value 470mA to 300mA? Please advise.

On the other side, customer changed the R422 of the attached “ET6000 RMB EPR1 Schematics P07.pdf” from 0.068 ohm to 0.1 ohm. The precharging current can be reduced to 300mA. We need product team advise if any side effect with this change.

Regards,

Arthur

ET6000 RMB EPR1 Schematic P07.pdf

  • 0
    TI__Genius 17380 points
    Hi Arthur,

    Precharging is hardware controlled and fixed to either 470 mA or 92 mA (as mentioned in battery charging app note or pg 60 of data manual, SWCS045C).

    As customer has discovered, it can be tricked by changing the resistance of the current sense resistor. This will effect all current set points in the TWL6030 battery charger. For example, the preconditioning and full charge portions will be reduced the same amount. For full charge, it can be modified during operation by I2C so it may not be a concern, but trickle charging for preconditioning will be a bit slower.
  • 0 in reply to Kevin LaRosa
    TI__Expert 6065 points

    Hi Kevin,

    customer changes the R422 (sensor resistor) of the attached “ET6000 RMB EPR1 Schematics P07.pdf” from 0.068 ohm to 0.1 ohm. The precharging current can be reduced to 300mA. Please let us know if any side effect issue happens with this change? Your advise and comments for this query is very appreciated.

    4353.ET6000 RMB EPR1 Schematic P07.pdf

    Regards,

    Arthur

  • 0 in reply to Arthur Huang
    TI__Genius 17380 points
    Hi Arthur,

    Other than the previously mentioned offset, I don't expect any side effect issues. They just need to make sure that if they are using any pre-existing drivers, if they select "1500 mA", it will actually be (1500 mA * (.68)).