Getting to the end of my design here...
My circuit (encoder signal interface to servo drive) has a bunch of discrete digital logic gate ICs. I cannot pull power from the servo drive's internal encoder power supply due to the weird way these are wired in the field device (SCARA robot - All the encoders have their power supplies tied together at the robot). Paralleling the encoder power output between all the drives seems like a bad idea since I doubt they are designed for this mode of operation. Also the encoders pull more power than any one drive supply can source (350mA max).
I have 2 options,
1) Provide power to this circuit and the encoders in the field using a low cost industrial 5V SMPS power supply.
https://www.trcelectronics.com/ecomm/pdf/mdr10.pdf
2) Power my circuit from the servo drive 5V output for encoder power, and separately power the encoders from the SMPS (tying the DC COM together between the 2 circuits).
Is there concern about directly powering CMOS chips from one of these supplies? A meter on the output gives really nice 5V and you can adjust it in so it is right on the money with load applied.
My circuit (encoder signal interface to servo drive) has a bunch of discrete digital logic gate ICs. I cannot pull power from the servo drive's internal encoder power supply due to the weird way these are wired in the field device (SCARA robot - All the encoders have their power supplies tied together at the robot). Paralleling the encoder power output between all the drives seems like a bad idea since I doubt they are designed for this mode of operation. Also the encoders pull more power than any one drive supply can source (350mA max).
I have 2 options,
1) Provide power to this circuit and the encoders in the field using a low cost industrial 5V SMPS power supply.
https://www.trcelectronics.com/ecomm/pdf/mdr10.pdf
2) Power my circuit from the servo drive 5V output for encoder power, and separately power the encoders from the SMPS (tying the DC COM together between the 2 circuits).
Is there concern about directly powering CMOS chips from one of these supplies? A meter on the output gives really nice 5V and you can adjust it in so it is right on the money with load applied.