R2 = 1.1K ohm @ 2W
R1 = 360 ohm @ 2W
L = 150 uH @ 0.67A (could not find a 170uH inductor)
Rsc = 0.5 ohm @ 5W
IC Datasheet
Vin = 3.5v
Vout = 5.15v (wanted 5.07v but maybe the inductor is not the right one or the resistors are a tiny bit off)
Vout (under load) = 4.37v (just what I am looking for)
Everything is perfect except the following:
I(in) = 0.57A
I(out) = 0.25A
How do I increase the current the IC is "allowed" to output. I replaced the Rsc resistor from the specified 0.22ohms to 0.5ohms because the circuit was only giving 150mA of current with 0.22ohms. I assumed if I used resistors values of 1.1K and 360ohm instead of say 11K and 3.6K, the output current would be greater. Wrong assumption. I want the current output to not be limited by anything except the IC itself (or 1.5A which is what the IC can output).
The "power supply" can output 3A of current if something is willing to draw it. The device connected to the circuit can draw more than 0.25A (the device can draw 1A). I know the inductor matters but being rated at 0.67A I am also assuming that it can output more current and the IC is actually limiting the output based on the combination of resistors and/or capacitors in the circuit (or is it consistent with what the inductor is capable of outputting with 0.57A going in to the circuit? So if I use an inductor rated for 2A I can expect 1A out?). I'm not really understanding the datasheet in terms of what components limit the current output. What parts can be added/replaced (and why) to NOT limit the circuit to lower current output?
Thanks a lot for your help!