Both sides are identical , not sure why it does not work? sounds like the two Mosfets on one side are on?
Leave motor disconnected and see if the high current still exists, IOW test where the high current is sourced.

 

Thank you Max.
I tested it without motor and it draws more than 3.5A.
very strange.

 

Sounds like you are turning on both Mosfets of one side?

 

Max, maybe this happens but I decided to make the board again to test it.
I will come back with fresh news and I hope the problem to be fixed.

 

Probably at least one of the mosfets is not being switched off like it should be.

 

Bill, maybe this happened. I'm waiting new parts from Mouser and next days I will make a new board to check it again.

 

You neeed to be sure that the gate voltage is completely removed when the mosfet is supposed to be switched off.

 

be sure that the gate voltage is completely removed when the mosfet is supposed to be switched off.

To avoid possibility ambiguity, "removed" doesn't just mean the gate is open, it means that the gate is forced to be at the source voltage (Vgs=0), either with a resistor or a switch.

 

Actually, in post #27, I should have stated " be sure that the GATE CHARGE, and voltage, are completely removed when the mosfet is supposed to be switched off. My apology for the omission.

 

I received the new parts, I made a new board and I took some measurements on gate drivers (IR2110) before to install the mosfets.

When the system is power on I took:

IR2110 (driver1)	IR2110 (driver 2)
Pin 7 11.26V	Pin 7 11.26V
Pin 1 0V	Pin 1 0V

When the code runs in CW direction

IR2110 (driver1)	IR2110 (driver 2)
Pin 7 11.26V	Pin 7 11.26V
Pin 1 0V	Pin 1 10.63V
Pin 10 4.96V	Pin 10 0V
Pin 12 0V	Pin 12 4.96V

When the code runs in CCW direction

IR2110 (driver1)	IR2110 (driver 2)
Pin 7 11.26V	Pin 7 11.26V
Pin 1 10.63V	Pin 1 0V
Pin 10 0V	Pin 10 4.96V
Pin 12 4.96V	Pin 12 0V

What I noticed it's that in both CW and CCW directions the HO Pin 7 on both IR2110 remains active and the only change is on the LO Pin 1 when I change the direction.
Is it normal? With this way it works the H-Bridge?

Thank you very much for your help, I really appreciate it.
Nikos