In regard to the 72442 and 72445 A0-A6 inputs
I understand that the A0-A6 and inputs are set by default by Voltage divider circuits shown in the application circuits as RT1/RB1 through
RT4/RB4.
For A2 and A6, there are nice little tables that show what voltage on the pin corresponds to what.
However, for A0, all I know is that the max output voltage is
5x RB1/(RT1+RB1) x (RFB1 +RFB2)/RFB2
Is there something that isolates the RT1/RB1 divider circuit to say what the ranges are going into A0 and possibly something that Isolates the RFB1/RFB2 divider into Avout? Or do I use trial and error?
And
A4 sets the max output current with RT3 and RB3.
It doesn’t tell me what settings correspond to what max output current.
I’ve gone through both the 72442 and 72445 data sheets and all three reference designs (I have examples from the SM72445 Eval Board reference design, specifically that I can get a "'Soft output voltage limit of 40V (AVOUT=3V)" with setting A0 to ~3V, but what voltage do I set it to for a voltage of 30.5V?
I don't want to have to program this thing I2C, just have it work with these resistor settings on startup.