My problem is the main P mosfet doesn´t deactivate entirely. More specificly its gate is at 8,4V (with 15V vbat voltage it makes 6,6V gate - source diference => mosfet is activated [it shouldnt be in this state when Q1 is deactivate]. When I activate Q1, P mosfet is activated too and everything seems working. Also I find out that complementary BJT´s gate is also at 8,7V.
My first suspicion was D1 (zener diode), but when I removed it, nothing changed.
Next I tried pull main P mosfet´s gate dircetly to VBAT to try if it isnt damaged. When I done that the mosfet deactivate => so mosfet is working.
I also tried to remove complementary BJTs to see if there isnt anything else pulling its gate to 8,7V, but after its removal complementary BJTs gate rised to VBAT, so there isnt anything else pulling it down.
I also tried to use higher VBAT voltage, but gate was still on something about 8V.
Do you have any idea whats forcing the complement BJTs to stay at 8V and therefore not deactivating the main P MOSFET?