I am building a power supply with LM723 and my intention is to have 0-30V and a range of 0-5A variable. I am regulating voltage normally, however for current limiting, if I want to regulate small current amounts like 10mA, 100mA I need a shunt resistor with high value, which is not viable for 5A, since with LM723 I need a 0.67V voltage drop to limit current.
Currently I am simulating my design with three parallel 0.33 Ohm shunt resistors, which will give me approx. 600mV voltage drop. That works for 5A, but nothing lower. When I calculate the resistor needed for a low current scenario, the value is too high to withstand the 5A.
I tried using a non-inverting amplifier to sense the difference and increase the voltage output, but the difference between R1 and R2 on the amp-op won't work well.
Any suggestions on how to do this? Is amplifying the voltage drop to input it on the LM723 even a good idea?