LTC3725
16
3725fa
Figure 5. High Current Transient Return Paths
APPLICATIO S I FOR ATIO
WUUU
LTC3725
FS/IN
–
GND
SIGNAL GROUND PLANE
POWER GROUND PLANE
V
IN
V
IN
GATE
V
CC
V
CC
PGND
UVLO
3725 F05
Effective grounding can be achieved by considering the
return current paths from the sense resistor to each
respective bypass capacitor. Don’t be tempted to run small
traces to separate the grounds. A power ground plane is
important as always in high power converters, but care
must be taken to keep high current paths away from the
GND reference. An effective approach is to use a 2-layer
ground plane, reserving an entire layer for GND and an
entire layer for PGND. The UVLO and frequency set
resistors can then be directly connected to the GND plane.
