RTOS/BQ25703A: How to use Solar Battery Charger MPPT

Ray Hsu

Expert 1330 points

Part Number: BQ25703A
Other Parts Discussed in Thread: CC1310

Tool/software: TI-RTOS

below is my solar panel spec, how to set my BQ25703A to support MPPT function,

which register i will set? and work with CC1310,

thanks!

over 7 years ago

0 Wang5577 over 7 years ago

TI__Guru 56650 points

Hsu,

The solar panel's open circuit voltage is 7.014V and maximum power at 5.678V. So, after the host controller is powered, please set Vindpm register to 5.696V which is closest voltage to the 5.678V. After Vindpm threshold is set to the solar panel's maximum power point, BQ25703A can support that panel's MPPT function.

0 Ray Hsu over 7 years ago in reply to Wang5577

Expert 1330 points

Hi,

Thanks for your reply,

If I use adapter 5V/9V and solar panel both,

Any other config need to set?

Thanks!

0 Wang5577 over 7 years ago in reply to Ray Hsu

TI__Guru 56650 points

Hsu,

When 5V or 9V adapter is plugged in, BQ25703A can automatically set the Vindpm=Vin-1.28V.
For solar panel, the default Vindpm may not exactly equal Vin-1.28V. So, please set Vindpm register to 5.696V manually.

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RTOS/BQ25703A: How to use Solar Battery Charger MPPT