hi turgut,
No luck with simulation,
Please try this simplified circuit, from the PDF
E

 

hi turgut,
No luck with simulation,
Please try this simplified circuit, from the PDF
E
View attachment 280888

Yes, i know because i wrote analog devices before. They have not a ltspice model about adp2291. Also im using completely this circuit but nothing works. Thank you for your interest.

 

hi turgut,
I found this circuit, it shows an extra transistor driving with the power transistor.
It is worth trying it out.

E
https://www.digikey.co.uk/reference-designs/en/power-management/battery-chargers/103

 

hi turgut,
I found this circuit, it shows an extra transistor driving with the power transistor.
It is worth trying it out.

E
https://www.digikey.co.uk/reference-designs/en/power-management/battery-chargers/103
View attachment 280890

I tried a version of this circuit with 2 fzt549ta but didnt worked. As i said i really tried lots of variation and different platform, web sites, manufacturer forum but nothing. Also I tried to find different kind charger in adp22 serie but 22 series has just 2 items. I wrote the manufacturer forum but nobody turn back to me. If i find how is this ic work i will write a comprehensive guide.

 

Yesterday i tried a different thing i want to write about what happened. I connected 2 BD136N transistor as parallel (days ago i tried 2 parallel FZT549) than i started the circuit which in figure.22. Than it works for 10 minutes i think. I got this results,
Vin=6V I=730mA
Vin=7V I=840mA
After that i measured the circuit to how much mV will charge. The battery charged 15mV by circuit in 10 minutes. It is not i expect but its new. Than i stoped the circuit to connecting to ampermeter to connecting battery. And i started again but didnt work. Now this two BD136N works like other transistors. (FZT549, FZT749, BCX53)
Today i will try new BD136Ns with a 5V relay. I will give the load to relay and transistor will fresher i think.

 

hi turgut,
Try this test.
Measure the actual input current from the 5V into the project, using a fully depleted battery on the output.
Also check that the 5V source voltage is not falling when on load.

Is the project built on a bread board or an actual PCB.?

E

 

hi turgut,
Try this test.
Measure the actual input current from the 5V into the project, using a fully depleted battery on the output.
Also check that the 5V source voltage is not falling when on load.

Is the project built on a bread board or an actual PCB.?

E

The project on a bread board. I will measure what you said. In addition i removed FZT549 to see what will happen if i remove the transistor and did this steps.
-Removed transistor.
-Connected DRV (base) to GND with a 330ohms resistor.
-Connected directly CS (emitter) to BAT (collector).
-And measured the currents like this,
Vin=6V I=496mA
I confused that i removed transistor so what is limitting the current? Why it is not higher than 500mAmps? Why it is not 750 mAmps?

 

Im confused that i removed RS resistor so what is limitting the current? Why it is not higher than 500mAmps? Why it is not 700-800 or higher mAmps?

Hi t,
It could be the battery itself that's limiting the current.??
E

Update: @turgut
As you are using a bread board, 750mA is a high current to pass through the push in connectors. That could be one reason why your results keep changing.
Also, the low value RS will have any contact resistance in series.

 

Hi t,
It could be the battery itself that's limiting the current.??
E

I tried battery with another battery charger so battery getting 600mAmps current. It means it is not about battery. Also i tried a new 200mOhms resistor so resistor cant be like battery. I really dont know but im thinking that its about ADP2291 IC.

 

Im adding the schematic. It is not working as expected

Is your CTIMER capacitor large enough to allow enough time to charge?

 

Is your CTIMER capacitor large enough to allow enough time to charge?

My Ctimer is 100nF as in datasheet.