I was wondering if the JETSON TK1 is fully functional when only 2 of 3 DC/DC AS3722 are mounted for VDD_CPU power supply.
Indeed in the schematic (page 35), we can read the following note:
“CAN EMPTY TWO PHASES FOR COST SAVINGS”
Thanks in advance.
I’ve done it that way in my design and it works but I’m yet to do full characterization (e.g. full load at highest ambient operating temperature etc): http://www.cct.co.uk/sheets/AG/aga1xm1d.htm
I based this design decision on max VDD_CPU current consumption during 1 second (from the datasheet). But if you do that it might be a good idea to add more bulk capacity on VDD_GPU.
In any case it’s your call as it depends on your tagret application.
AS3728 DC/DC for VDD_CPU theoretical maximum is 8A.
AS3722 PMIC is for overall system.
The Table 46 Maximun Operating Current from https://developer.nvidia.com/rdp/assets/tegra-k1-datasheet show that
VDD_CPU max 15.5A or 13.2A is required depending on Use Case Model 1 or 2 (explained in 2p of the datasheet)
Therefore 2 of DC/DC AS3728 or 16A will meet VDD_CPU requirement of max either 15.5A or 13.2A.
Thanks for your feedback.