Tool/software:
Hi,
I am using TPS62125 chip to harvest power from my solar cell at (4.6V,40mA) max power point - at high light levels - from one side and drive a 100Ω load on the other side at 3V.
The chip seems to have a great performance when compared with other TI PMICs.
The only issue I see is that TPS62125 does not operate at max power point on the solar cell side input. This is not an issue when solar cell is exposed to high light levels when it generates ~200mW, it can easily drive the load with ~100mW required power. In this situation, solar cell voltage is set to about 5.4V close to its open circuit voltage.
But when the light level and solar cell input power drops, TPS62125 does not seem to operate efficiently. For example when the input powers are ~80mW, solar cell voltage drops to near 3V which seems to be the minimum operating voltage of TPS62125 and the output voltage collapses to ~2V.
Is there anyway I can let TPS62125 set the input operating point at 4.6V maximum power point so that if can harvest maximum power from the input and run the system at a wider input power range?
