[TriEmbed] Ground Confusion

[Martin Brooke]

​If you are using the chip for 3.3 V out you do not need to worry.

The problem arises when you use the resistors R1 and R2 to support a higher
output voltage.​

If the ground on Resistor R2 (see page 12 of the data sheet) is not very
close to pin 9 you could get small voltages due to current in the ground
paths making your circuit behave unexpectedly.

​The example PCB in the other document you had on the dropbox has this type
of layout​.

For the 3.3V case the resistors are internal to the IC and so you need not
worry.

If you are worried about ground use a two layer board and make the back
ground, avoiding any long gaps, or large holes in the back ground plane.
 Then just use vias to that ground plane for all your ground connections.

Cheers,

Martin
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