The UC39432 is an adjustable precision analog controller with 100MA
sink capability if the ISET pin is grounded. A Resistor
between ISET and ground will modify the transconductance while decreasing the maximum current sink. This will add further control in the Optocoupler
configuration. The trimmed Precision Reference
along with the non-inverting error amplifier inputs are accessible for custom configuration. A sister device, the UC39431
adjustable shunt Regulator
has an on-board Resistor
network providing six preprogrammed voltage levels, as well as external programming capability.