Hello All,

This might be bit odd but I found this discussion, and thought of asking you all

I am currently working on Switch mode Power supply IC's which will have input voltages ranging from Vbatt (12V to 48V) nominal as DC input to this IC

I wish to control the output voltage of the SMPS IC (LM25117-Q1) , either with digital POT MCP42010 with dsPIC30f4011 (as it has CAN Bus) terminal with it for communication with the other modules.

I am not fully sure if I should go ahead with designing the circuit ...

And how will I have a working connection with that of digital POTI with dsPIC4011 .

Is it good way ? or using few opamps and external circuitory going ahead with PWM will be option ?

I am not sure at this point as PCB design followed by micro-controller programming is what I have to work thereafter


thanks in advance

 

Your problem is the smps chip uses an Analogue input to contol the output voltage, using a two resistor divider, if you're using a digital pot the steps between each resistance may be too large for fine control.