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BQ25505

Vlad Lazar
Prodigy 50 points
Other Parts Discussed in Thread: BQ25505

Hey,

I just ordered the BQ25505 eval board. However when I chose my solar panel, I got one with OCV of 4.5v, which is more than the max 4v rating. Do I need to ensure that this voltage is never bigger than 4 or it could work as is?

  • 0
    TI__Guru**** 166956 points

    The latest bq25505 datasheet shows the expanded input voltage range up to 5.1V.  The solar panel's MPP is about 80% of OCV or 3.6V.  So, as long as you set VBAT_OV > 3.6V, the boost charger should work for you. 

  • 0 in reply to Jeff F
    Prodigy 50 points

    Hello,

    I had another small question:

    Is there a simple way to adjust the MPPT voltage point with the BQ25505EVM-218 evaluation board, or I would need to unsolder/resolder new resistors according to the excel sheet? 

  • 0 in reply to Vlad Lazar
    TI__Guru**** 166956 points

    The EVM allows you use to use a jumper to set the VOC_SAMP pin high or low for MPP levels of 80% or 50% of VOC. respectively.

    Or you can use another jumper to tie VOC_SAMP to the on-board resistors that set the MPP level to 75% of VOC.

    You need to solder new resistors if none of those options work for you.