Hi,
I am using the TPS26625 together with the LM74700 in a power oring application for a daisy chained RS485 network but I do have a few questions and, if it is not too much to ask, would greatly appreciate a review of the design. Power supply is 7V to 36V coming from either J1 (terminal block) or J2 (RJ45). In a standard network the first device will be powered from J1 while downstream devices will be powered from J2. Since in a long network there will be voltage drop in the cables I would like to be able to re-power downstream devices at any point in the chain if necessary.
The TPS26625 features reverse output voltage protection so I suppose it's OK if voltage at J2 is higher than voltage at J1, that is, voltage at TPS26625 OUT is higher than voltage at TPS26625 IN at any upstream device.
Is it OK to connect LED D9 as shown?
What should I do with nSHDN (PS26625 pin 4)? I am not using it so I wonder if can be left floating. The datasheet specifies absolute maximum rating for this pin at 62V but recommended operating condition is up to 6V. Can I just pull it up to VIN through a large resistor?
Best regards and many thanks in advance,
Christof
