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problem with driving mosfet using tlp250

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rokai1990

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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)
83_1320094790.gif

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
 

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

thanks for reply
54_1320175186.jpg

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
 

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