No, this schematic isn't from the datasheet whatsoever, it was designed by some other person. All I know is that in the datasheet, there is no mention of using zener diodes.. There is a mention of using schottky rectifiers in order to switch the coil, but I can't see how one could use the zener diode in this circuit..
Also, in the datasheet, it mentions not to use aircoil inductors because of their low current capabilities.. It recommends using smaller coils with the proper ratings for the application.
This is why I follow datasheets when designing.. not other people's schematics. I trust the manufacturer more then anyone else..
Steve