Buck converter input power problem

[transistor12]

I powered my dc buck module with a transformer .
Transformer spec : input volt= 220v, Output volt= 24v , 190VA. I used bridge rectifier to make AC to DC  and 1000 microfarad-50V capacitor to smooth . Now float voltage 35V.
Buck spec : input = 5v - 32v. 5A  model : XL4015

After connecting the buck module  burnt within 10 seconds.
Before i used the buck with 12V 60A battery to power up the module and charged 18360 battery pack of my Bosch hand drill .
I could not understand why transformer damaged the module. I guess :
1)  buck module can't tolerate ripple to the input side .
2)   Float volt may cause damage. Am I correct ?
Any suggestion ? Waiting  ......