The UC19432 is an adjustable precision analog controller with 100-mA 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 UC19431
adjustable shunt regulator, has an on-board resistor network providing six preprogrammed voltage levels, as well
as exernal programming capability.