Other Parts Discussed in Thread: , BQ24650
Hello TI e2e forum
I am working In Agam-Control company, we are manufacturing solutions for irrigation
We have products which operate from Solar Panels 6V, and 12V, using the sun energy to charge Li-ION or Li-Polymer battery -one cell
Vin can vary from 3V to 24V, we found TI BQ25798 new buck-boost charger with MPPT for solar panel
We are testing The BQ25798 -Evaluation module (BQ25798EVM) trying to confirm the chip operating modes
One of our operating conditions, is working from external Voltage, without the internal Battery
We are working with12V input source It is a lab power supply, the max current from the LAB PS consumes 0.8Amp, the battery is disconnected, this mode is written as a valid mode in spec, we are loading the output, signal system with changing resistor Load to control the current and consume 2Amps
When we do it, we have voltage drops to 1.5V every few seconds (Question: Is this normal by design?) , when we try to consume more current from the system output, at 2.5Amps, we see that the output voltage is disconnected, and the output voltage drop to zero. Our operating BQ25798 is 1.5Mhz
The output voltage does not return at all, even if we disconnect the load, or wait enough time in case we think we had a thermal shutdown (we waited 4 hours )
We understand that there is a current limit protection , but when this condition is ending , we expect that the output voltage will return back
Our CPU and all digital circuits are operating from the SYSTEM voltage , this mean ,that all our power source to our CPU is turned off , and board is dead , we can’t disconnect power ,it is in filed , we can’t control the I2C or reset the chip , no CPU , product is dead
I want to confirm that when I have a valid input voltage, the system will recover and output voltage will return back to work in no time, how can I confirm it?
- I would like to know if the voltage drops are legitimate situation?
- How can I be sure that these voltage drops will not cause output voltage shut down?
- How can I calculate My voltage drops, related to my current consumption?
- How can I cause that the output Voltage will return to work?
- Will interrupt signal from the BQ25798 to the CPU report on such a problem?
- If yes, can I control such a situation with the I2C, to prevent system voltage drop to zero, before it happens?