lt3781 Linear Technology Corporation, lt3781 Datasheet - Page 15

• Manufacturer Part Number: lt3781
• Description: Bootstrap Start Dual Transistor Synchronous Forward Controller
• Manufacturer: Linear Technology Corporation

APPLICATIO S I FOR ATIO
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
bypass elements must be oriented such that transient
U
U
W
Figure 6. High-Current Transient Return Paths
LT3781
5V
SGND
REF
U
V
BSTREF
V
PGND
BST
CC
currents in the return paths of V
must be taken to keep these transients away from the
SGND reference. An effective approach is to use a 2-layer
ground plane, reserving an entire layer for SGND. The
5V
then be directly connected to the SGND plane.
REF
V
V
BST
CC
and nonisolated converter output bypasses can
V
IN
IN
and V
CC
do not mix. Care
LT3781
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