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solar cell boosting with TPS61200

Mario Avila
Prodigy 140 points
Other Parts Discussed in Thread: TPS61200, TLV431

Hi,

I am reading the application report SLVA345B "Supplying TPS61200 With a Single Solar Cell" and I have some questions.

In my device I need to boost the voltage of the solar cell up to 5v. Acording with datasheet I have to choose proper values for R1 and R2 in this diagram

The question is, do I have to change any other componet's value? I don't think so, but I would like to be sure.

Next thing is in the MPP circuit. If I understand its function properly it compares Vcell with a voltage selected by changing R4 resistance, in order to avoid Vcell getting higher than a selectable value. My question is: Can I just choose a fixed value with a voltage divider or a voltage reference? For a single solar cell I believe its voltage should not exceed 0.4V otherwise it would not be able to supply current.

Thank you.

  • 0
    TI__Mastermind 46905 points

    besides R1, and R2, the R4 should be changed to a voltage divide if you have know which voltage is the best for MPP. I'm not sure which kind of solar cell you select, but according this datasheet http://www.q-cells.com/uploads/tx_abdownloads/files/Hanwha_Q_CELLS_Data_sheet_Q6LMXP3-G3_2013-04_Rev01_EN_08.pdf ,  this voltage should be 0.5V.

    other components can be unchanged.

    thanks

    Jasper 

  • 0 in reply to Jasper Li
    Prodigy 140 points
    I was planning to replace TLV431 and R4 for a 0.5v reference but I'd rather use this scheme. Thank you.