PCB routing guideline for L6566BH

We have started working on PCB for L6566BH based design for 277V and 480V. Now we require some PCB layout Guideline for the chip, which is generally available in case of other Power Supply switcher, We were trying to get online document for this chip for PCB Layout Guideline but didn't get anything. Please provide us PCB Guideline for this chip or similar to this, which can help us in routing it efficiently and which will help reducing the basic design error for ST, We will also require your valuable time and support to review our placement and issues which help in placement related issues as we are new to ST chip.