7462.SCHEMATIC1 _ [18]POWER DC TO DC.pdfIn
attached schematics you can see how we had implemented two step down power supplies using TPS54260DGQ.
These supplies provide 4.2VDC and 5.0VDC.
The problem we have is as follows:
When the input voltage (NET 12V_PS_IN) goes below 8.1VDC, the power supplies stop working properly.
You can assume that pin#3 (EN) of each is above 1.5VDC
Please let me know if there is a solution, that will allow generation of the 5VCC supply and the 4V2 supply,
When the input (NET 12V_PS_IN) goes below 8.1VDC, as much as possible.
We need to operate this circuit with voltages as low as 6.0VDC