BQ25505: Solar cells in parallel question

Michael Walker

Part Number: BQ25505

I am planning to use the BQ25505 with multiple solar cells in parallel. Should there be any reverse protection between the cells? like the diagram below?

Thanks for your help.

over 2 years ago

+1 Jeff F over 2 years ago

TI__Guru*** 149365 points

Hi Michael,

If the cells can be user interchanged and there is a risk of reverse install, then yes. Keep in mind the average input current to the BQ25505 is 110mA (peak inductor current of 220mA) so if, for example, each cell provides 50mA, four is parallel provides 200mA, which is more average current than the BQ25505 will accept.

Regards,

Jeff

0 Michael Walker over 2 years ago in reply to Jeff F

Prodigy 20 points

Thanks Jeff,

Will this be an issue if I connect a source that can provide 400mA? will it damage the device or will the BQ25505 limit the current?

+1 Jeff F over 2 years ago in reply to Michael Walker

TI__Guru*** 149365 points

Hi Michael,

The BQ25505 limits the current. No damage expected.

Regards,

Jeff

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BQ25505: Solar cells in parallel question