Hello David,
Very sorry for my delay.
The max current our 1.5v core can supply is 3A. Someone work with me tell me it may enough and let me don't worry that. We have checked the voltage of 1.5v is ok when the program running. They said the current is not easy to check and voltage of 1.5v is good means the current surely good. Are they right?
Now our lab is making a new board for checking if there are the hardware problems.
Besides the current, if there are other points I haven't noticed which lead to the problem.
Eager for your reply
coco.