12v Sealed lead acid battery charger

Hi All,
I'm trying to build a battery charger to charge a 12v 45ah lead acid battery, I've had a look around the internet for schematics and I've found a couple but the first was too complex and the second doesn't work. I've looked at rs online to see if any of their battery charger i.c's were any use but I couldn't find anything. Could anyone help me please :roll:

Battery charger

Hello,

This IC may be used for your charger

https://www.ti.com/sc/docs/psheets/abstract/apps/slua115.htm

Regards