SiC639
www.vishay.com
Vishay Siliconix
S18-0300-Rev. A, 19-Mar-18
13
Document Number: 76585
For technical questions, contact: powerictechsupport@vishay.com
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ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
Multi-Phases VRPower PCB Layout
Following is an example for 6 phase layout. As can be seen, all the VRPower stages are lined in X-direction compactly with
decoupling caps next to them. The inductors are placed as close as possible to the SiC639 and SiC639A to minimize the PCB
copper loss. Vias are applied on all PADs (V
IN
, P
GND
, C
GND
) of the SiC639 and SiC639A to ensure that both electrical and thermal
performance are excellent. Large copper planes are used for all the high current loops, such as V
IN
, V
SWH
, V
OUT
and P
GND
. These
copper planes are duplicated in other layers to minimize the inductance and resistance. All the control signals are routed from
the SiC639 and SiC639A to a controller placed to the north of the power stage through inner layers to avoid the overlap of high
current loops. This achieves a compact design with the output from the inductors feeding a load located to the south of the
design as shown in the figure.
Fig. 24 - Multi - Phase VRPower Layout Top View
Fig. 25 - Multi - Phase VRPower Layout Bottom View
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon
Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package / tape drawings, part marking, and
reliability data, see www.vishay.com/ppg?76585
.
V
OUT
P
GND
V
IN
