1. We are facing a issue, our SMPS based 2A charger for lead acid charger gets burnt sometimes when they run on old type of generators. However on ac mains, we have tested upto 310Vac they work fine.

2. So we want to make it transformer based. Although there are lots of circuits available on internet for 2Amps for 12V lead acid charger like this
https://dmohankumar.wordpress.com/2011/08/03/4653/


Want to know if someone has experience in designing transformer based chargers for lead acid chargers, for suggestions or references, which we can keep in mind before designing or there is dedicated IC for this purpose

 

You only need a transformer and bridge rectifier for a simple battery charger.

 

You only need a transformer and bridge rectifier

.... and a fuse and a series resistor to give some protection if the battery is dead flat.

 

There is the Maxim MAX712.
http://www.rason.org/Projects/gelcell/gelcell.htm
Max.