any switcher IC like/similar IC u3843 that can take I/P 40 to 60v dc and we want to convert this volt to 5v dc

[ashutamar]

any switcher IC like u3843 that can take I/P 40 to 60v dc and we want to convert this volt to 5v dc

we have tried these circuits have a look at this drive link

https://drive.google.com/open?id=1MhtkH4kwJYyro00IqTu6guRDOnfzlo0-&authuser=narendra%40sixsensemobility.com&usp=drive_fs