LM2596 Buck Module

LM2596 adjustable output BUCK regulator data sheet diagram:
PCB principle book diagram:
② As the DCDC switching frequency increases, the power supply ripple becomes smaller, the loop bandwidth becomes higher, and the system's transient response will be better. At the same time, the higher the frequency, the smaller the inductance (corresponding to the PCB size), but at the same time, the Buck switching loss and the hysteresis and eddy current loss of the inductor also become larger. Some trade-offs need to be made in the actual design; due to the low internal switching frequency of the LM2596, for 12V input, the inductor should preferably be 33uH or 47uH. If the input is above 20V, the inductor should preferably be above 100uH.
③Output voltage: VOUT=1.23*(1+RP2/RP1)
④Inductor selection: Vsat = 1.16V, VD= 0.5V(diode voltage drop)
E·T=(Vin-Vout-Vsat) * (Vout+VD)/(Vin-Vsat+VD) * (1000/150kHZ)
⑤Feedforward capacitor selection: CFF= 1 / (31 * 1000 * PR1)