Lm2596 brings crural graph to use circuit

Lm2596 is chip of common regulated power supply, it is chip of step-down report source control, he can export the drive electricity of 3A.

Circuit of Lm2596 representative application

Lm2596 makes crural plan: 1 for + VIN, 2 for Out Put, 3 for Gnd, 4 for Feed Back, 5 for On/off.
Myself says below debug experience: Tonight is to surprised to blame really, it is first on exploded tantalum capacitance, next champion burns chip, finally is I burned an inductance. . . Stop no less than rhythm that come at all
Experience card circuit is feasible, but after changing resistor R2 into potentiometer, did not output, burned an inductance, dare not move tonight next, connect clouds deeply ten minutes to burn 3 steering engine to be ancient bronze mirror with (Ps: ? Does tuft orangutan palm target swan every blow  of high and steep of reason of ǖ of the Gua that play act copy   ?

Lm2596 circuit pursues