SPV1050 - 100mV on BATT pin and no output on LDO2?

[PSław.1]

Hi! I'm working on a project using SPV1050. The configuration and schematic for my device is as on the schematic below. I'm providing 4.3V on line PV+ (pin20), yet I have only 100mV (not rising) on BATT pin and absolutely no output on LDO2 pin. Why can that be? Thanks!

[Peter BENSCH]

Welcome, @Piotr Sławęcki​, to the community!

LDO2 can only work if there is sufficient voltage at pin STORE, so first please check the voltage at this pin.

The internal pass transistor between STORE and BATT will be closed once the voltage at pin STORE will be high enough to trigger EOC, i.e. VEOC (voltage at R5) > 1.23V.

It might be necessary to disable or modify MPPT depending on the impedance of your input voltage of 4.3V, which is described in section 6 of the datasheet, e.g. connecting MPP-REF (pin 3) to GND.

Regards

/Peter

[luckysquad]

Hai may I know what software did you use to do a simulation using this IC SPV1050. Cause I try to find software that have this IC but only provides for creating in PCB, not for simulation. if you don't mind can you help me?