Voltage regulator for 0 to 1V

Other Hardware General Electronics
1

I need to provide exact voltage 0-1v to control current through a driver IB462H with the picture of the page below. I am hesitant using resistors to control the voltage since the output voltage may change if there is a variation in the current.

all the voltage regulators I found start around 1v and up. is there a regulator or another solution to that would output <1v? Easily adjustable regulator will help since I may change the voltage time to time (for 1.2amp vs. 2amp motors) but more "permanent" solution will be fine too.

P.S. I am also little confused about the resistor value table: how the higher resistor values would give higher current since the formula shows that the current increases with the increase in voltage (closer to 1v should output 1amps). Am I missing something?

P.S. the voltage divider current referenced in the text uses IC 71HC123 to cut down current when not stepping and should not matter for this question - I assume.

2

How do we know what you are trying to do?

Do you mean this?
http://motion.schneider-electric.com/downloads/manuals/discontinued_prod/ib462h.pdf

Pin 1 should be a high impedance input. A voltage divider from a regulated 5V line should be sufficient, selecting resistors so that you never exceed the limit of 1V.

3

A voltage regulator provides power, this is a control signal, not a power rail, so
a resistor divider or a DAC output are fine. All the pin does internally is
drive a couple of comparators.

BTW that's a good thorough datasheet - figure 1.7.2 shows how to wire
up the current limit circuitry with a divider including an option current-reducer for
idle time. Note the 0.1uF cap to keep noise off the input - stiffens up the output
from the divider in the facing of switching transients.