Tool/software:
Hi all. I am using the above buck power supply to generate a 3.3V rail with inputs ranging from 10V~28V. Below is the schematic:
There are several downstream buck regulators using a separateTI switcher to generate 1.0, 1.2, and 1.8V. There is also a switch that connects this 3.3V from the TPS54260 to a load. (FPGA + ethernet switch)
When I enable some of these downstream supplies, the voltage on the 3.3V collapses to roughly 1V or less. I do not measure a short on the circuit board on any of these downstream supplies, and the current from my input voltage leads me to believe there is not a short on the PCB either. I calculate that the external 13V supply is providing <2A under these conditions, so I think the chip should be able to support this. But I wonder if I'm tripping an internal current limit internally when this happens.
Any ideas?
Thank you,
Geoff
