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BQ24210: Calculating of RVDPM?

Part Number: BQ24210

Hey I have a question, in the datasheet of the BQ24210 it says on page 11 that RVDPM is calculating like so: RVDPM = (VBUS_DPM – VBUS_DPM_1)/KVBUS_DPM. But on page 5 there is a entry where RVDPM is calculated like so KVBUS_DPM × (VBUS_DPM–VBUS_DPM_1). So what is now the right formula? The Unit of KVBUS_DPM is V/KOhm so the first formula should be right.

But when the first formula is right how do I connect a 6V solar panel to this chip? When I calculate RVDPM = (6-3.5)/0.15=16.66kOhm, That is already outside the specifications, or am I missing something here? How do I solve this issue to get this Chip working with Maximum power tracking?

I hope someone can help me, best regards.

  • I agree that Equation 1 on page 11 is the one that should be used " RVDPM = (VBUS_DPM – VBUS_DPM_1)/KVBUS_DPM". Will update this on the next revision.
    With the recommended range of RVDPM 1k to 10k this will limit VBUS_DPM to 3.65V to 5V.
    Max value would be 10k / 5V.
    What is the Short Circuit Current of your solar cell and what is your charging current?
  • I wanted to use a Solar Panel with
    VPM: 6V
    IPM: 166mA
    ISC: 200mA
    VOC: 7.5V

    but with the BQ24210 this Panel can't operate at it's maximum power point so, I will just look for a 1W panel with 4-5Vpm?

    The charging current is gona depend on the panel power but I want to use something like 250mA