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BQ51050B: calibration of RX per SLUA731

Bo Cheng
Prodigy 35 points
Part Number: BQ51050B

Hi, 

I am working on the calibration of RX per SLUA731 (FOD GUI User's manual), section 6.3. The equipment requires Source meter with 3-A current rating (Keithley 2425) uses as a load during the calibration. 

For my application, the battery we chose has 1000mA charging current. Do you think it is sufficient to use Keithley 2400 instead, that has 20W, +/-1uV to 200VDC, +/-10pA to +/-1A specification? 

Furthermore, 

Since the Source meter is used as a load, to adjust the current, do I need to use current sink function? in other words, should the current be negative? Table 1 from SLUA731 shows positive current. I am a little bit confuse on this part. 

Thank you for your help 

-Bo

  • 0
    TI__Guru* 75756 points
    Hi Bo
    Yes the Keithley 2400 or others will work provided you can load your unit to the max current you are designed to. Not all designs will go to 1A.
    The load current will show negative on the Keithley but should be entered as a positive in the table.
  • 0 in reply to Bill Johns
    Prodigy 35 points
    Thank you for answering my questions.

    For the question on the source meter, should I use current sink function, which entering negative voltage on meter to provide the constant current?


    Further information:
    I set up the calibration, and I load the positive current following by the instruction of SLUA731 and I dont see negative current displayed on the meter.


    One more question that I came across during the calibration:
    what compliance voltage should I set to on the source meter? SLUA731 didn't mention it.


    Thank you
    -Bo
  • 0 in reply to Bo Cheng
    TI__Guru* 75756 points
    Hi Bo
    Will work with you off line on this one