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I'm using LM2596 for the power supply of SIM800 GSM module. LM2596 is stepping down voltage to 3.8V. I have attached schematic diagram of it.

It is working good if I use 12V-5A SMPS as power source. But when I use other supply like 24V-2A, LM2596 burns out while SIM800 is registering on network(during this time SIM800 draws more current). I'm not getting why it is burning out. enter image description here

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Circuit diagram from questtion: -

enter image description here

You have your flyback diode in the wrong place. D1 on your circuit should be where D1 is shown below: -

enter image description here

I'm not ruling out other problems as well.

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