Other Parts Discussed in Thread: UCD74120, UCD7242, TMS320C6678,
Team,
My customer is seeing this intermittent issue:
I have a board with two TMS320C6678 DSPs. They are being powered by a UCD9244 along with UCD74120 for CVDD and a UCD7242 to supply the 1.0V and 1.5V.
When the board is up and running I observe that there is a current draw of about 1.6A on the 1.5V supply.
What I am seeing is that at intermittent times the board will power off with the only failure indication being that the FLT line for the 1.5V rail has tripped. I have done some investigating and determined that the failure is not due to temperature, but it appears to be from an over-current fault. I connected a scope to the board monitoring FLT, IMON, and PWM of the chip. What I am seeing is that the PWM coming from the UCD9244 seems to change drastically causing the IMON to spike and a fault to be thrown.
I am seeing this on multiple boards, and it is very intermittent. I have seen boards run anywhere from 1 minute to over 24 hrs. Any help would be appreciated.
Thanks
Viktorija