AST1S31HF Datasheet, PDF (24/33 Pages) STMicroelectronics – Internal soft-start and enable

Application information
AST1S31HF
Figure 10. PCB layout example
Via to connect the thermal pad
To bottom or inner ground plane
Star center for common ground
Short FB trace
Short high
switching
current loop
Input cap as
close as possible
to VINSW pin
VINA derived from Cin
To avoid dynamic voltage drop
Between VINA and VINSW
AM11423v1
24/33
DocID026968 Rev 2