problem with driving mosfet using tlp250

[rokai1990]

hi everybody,
iam going to build a buck-boost converter and i use the tlp250 to fire the mosfet and i have a problem that the o/p voltage is much lower than the correct value and i think that i have a problem with grounds (ground of the cct of the converter,the ground of the microcontroller and the ground of the tlp250)

now i connect the source of the mosfet with the gnd of the tlp250 and isolate all the other grounds form each others please help me to detect the error

 

[Raza]

Can you upload the control section. I do not think ground is problem. Seems your drive of MOSFETs not proper.

 

[rokai1990]

thanks for reply

2 with the pwm pin
3 with ground of the uc
8 with 12vdc
5 ground of the 12v
6 to the gate and the source with the ground of 12v
drain to the positive of the i/p to converter