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AN4043 датащи(PDF) 52 Page - STMicroelectronics

номер детали AN4043
подробное описание детали  In recent years the variable speed motor control market has required high performance
PDF  60 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4043 датащи(HTML) 52 Page - STMicroelectronics

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Design and mounting guidelines
AN4043
52/60
Doc ID 022726 Rev 2
In
Figure 34, general suggestions for all SLLIMM-nano products are summarized.
Figure 34.
General suggestions
Special attention must be paid to wrong layouts. In
Figure 35 and Figure 36 some common
PCB mistakes are shown.
Figure 35.
Example 1 on a possible wrong layout
V
IN(VL)
V
IN(VH)
to
MCU
V
IN(WL)
V
IN(WH)
to
MCU
+15V
GND
from
power
source
Shunt res is tor
P ower G ND (N)
V
IN(UL)
V
IN(UH)
Shut down
to V
DD
Phase current
S ignal ground and power ground mus t be connected at only one point
(star connections), avoiding long connections.
P lease ensure a safety distances between ground tracks and noisy tracks
(high voltage or high frequency s ignals tracks)
Use of low inductance type res is tor,
s uch as S MD one, can help to
further decreas e the paras itic
inductance
R educe all dis tances
between shunt resistors and
SLLIMM-nano power G ND
Place an R C
filter directly
across S D pin
P lace an R Cfilter directly acros s
the C IN (for each phase) pin to
avoid false s hort-circuit trigger
Boots trap capacitor s hould be
located as close as pos s ible
to the SLLIMM-nano pins
Layer 1
Layer 2
P
U
V
W
VBOOTU
VBOOTW
NV
NW
NU
VBOOTV
Bus
capacitor
Decoupling
capacitor
LINU
HINU
LINV
HINV
OP OUT
LINW
HINW
SD/OD
CIN
GND
SD/OD
VCC V
VCC W
OP -
OP +
VCC U
AM11823v1
Bus
capacitor
V
IN(VL)
V
IN(VH)
to
MCU
V
IN(WL)
V
IN(WH)
to
MCU
+15V
GND
from
power
source
LINU
HINU
VCC U
LINV
HINV
OP OUT
LINW
HINW
SD/OD
CIN
GND
SD/OD
VCC V
VCC W
OP -
OP +
Shunt res is tor
P ower G ND (N)
V
IN(UL)
V
IN(UH)
Shut down
to V
DD
Phase current
Layer 1
Layer 2
WRONG!
C IN filter ground is not the
s ame as per SLLIMM-nano
ground.
T his may cause noise
WRONG!
C IN filter is close to high voltage
s witching track (V
BOOT).
Noise will influence comparator
performances
WRONG!
Long dis tance between C IN filter and
SLLIMM-nano C IN pin. It is important to
minimize this dis tance in order to reduce
the noise impact
CIN
filter
P
U
V
W
VBOOTU
VBOOTV
VBOOTW
NV
NW
NU
Decoupling
capacitor
WRONG!
R ight-angled track turns
produce a field concentration
at the inner edge.
Prefer 45 angled tracks
WRONG!
S tub connections and vias produce
reflections , especially on critical s ignal
tracks. P refer s tar connections and
reduce number of vias
WRONG!
Decoupling capacitor is too far from
SLLIMM-nano.
C onnect it as close as pos s ible to the
P pin
AM11824v1



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