For a mobile application i need a much faster mppt circuit, for example a new reference voltage every 100ms.
As described in the Datasheet i have to connect VOC_SAMP to VSTOR to deactivate the integradet MPP-Circuit.
Further I have to integrate an external high-side switch (e.g. TPS22903) between the solar cell and the VIN-DC Pin to measure the Open Circuit Voltage of the solar cells.
Additionally a switch between an input resistor divider (80% Vin) and the capacitor on VREF_SAMP (CREF) would load this capacitor with the reference voltage every 100ms.
A ultra low power uC would therefore control both switches with a pwm output.
In theorie this should work, but what I am exactly doing is to implement the whole mpp circuit which is already integraded in the BQ25504, just because i cant live with the mppt timing.
Isn't there a smarter way to handle this, for example changing the mppt timing with the size of CREF?
