Stanley, Design is a process of making choices that when comleated result in a product that works as advertised. The parameters for the components used in a design are not perfect so the designer selects the part of the specification curve that best meets the overall goal. if you use a product outside of the expected range of operation the selected compromises will probably cause you problems.
For a single unit you may get lucky , or you may be able to set it up for your requirements, but in production it will not work.
An example is the 317 regulator. From the specification sheet I have for it Iout min is 5 ma. so It is designed for a minimum load current of above 5 ma.
With a vin about 4v above vout I have used it to control 1.5 amp loads at 350 volts or greater than 500 watts of power. The efficiency is about 99% so it was a very effective solution to a vexing and complex problem. If you try to use it on a battery supplied design intended to run as long as possible on a small battery with less than 3 ma designed load current you would have a problem. You might find one that worked with a 1 ma load current but it probably would drift badly with temperature changes if you try to use it at this low an output current. This is not a fault in the design rather it is a result of the choices the designer made.
Without seeing the schematic for the controller or its specifications no one can pinpoint the areas of difficulty, but anyone with experience will expect them . Bottom line READ the DATA SHEET if it is available , if you do not read it you should expect problems that do not make sense to you due to yourlack of information.
Dang it you got me up on a soap box. hope this helps regards Terry