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LT1171 IC getting damage

Product Number: LT1171


I have the following requirements

Input operating voltage = 30V to 100V

Output voltage  = 28V

Load Current = 1A

Operating frequency 500KHz.

As I have the PCB space constraints I have used minimal essential components required.

When I operate the device below 25V, the ouput is same as input, but when I increase the voltage the device is getting damaged.

As I see in the datasheet, 100 duty cycle should be avoided when output voltage is above 16V, So I tried by applying 40V directly. Then also remains same issue.

Please suggest solution for this issue.

I am attaching the schematic for your reference

Thanks in advance

 -- Kumar

Moved to the correct forum and added product number tag.
[edited by: emassa at 2:39 PM (GMT -5) on 28 Nov 2022]