LT3781 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT3781' PDF : 20 Pages View PDF
LT3781
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
currents in the return paths of VIN and VCC do not mix. Care
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
5VREF and nonisolated converter output bypasses can
then be directly connected to the SGND plane.
LT3781
VBST
VBST
VIN
5VREF
SGND
BSTREF
VCC
VCC
PGND
Figure 6. High-Current Transient Return Paths
3781f
15
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