I am designing a DC-DC step-down converter (asynchronous) and I would like to achieve a Li-Po charging with it (18 - 22 V input voltage). My goal is the CC/CV charging but to do this, I need constant voltage (4.2 V) on the output. I have simulated the circuit in MATLAB simulink (with battery model) but I can only measure the battery voltage. I am monitoring the input current/voltage and the output current/voltage too. I am so confused with this now, I have read many topics, articles. Can I achieve CC/CV with asynchronous buck converter?
I have found a CC/CV design for buck: https://e2e.ti.com/blogs_/b/powerhouse/archive/2017/11/24/how-to-design-a-simple-constant-current-constant-voltage-buck-converter
Can I achieve it with asynchronous buck too?