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LT1506CS8 датащи(PDF) 15 Page - Linear Technology

номер детали LT1506CS8
подробное описание детали  4.5A, 500kHz Step-Down Switching Regulator
PDF  24 Pages
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производитель  LINER [Linear Technology]
домашняя страница  http://www.linear.com
Logo LINER - Linear Technology

LT1506CS8 датащи(HTML) 15 Page - Linear Technology

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LT1506
APPLICATIONS INFORMATION
from the switch node. Also note that the high current
ground path of the catch diode and input capacitor are kept
very short and separate from the analog ground line.
The high speed switching current path is shown schemati-
cally in Figure 6. Minimum lead length in this path is
essential to ensure clean switching and low EMI. The path
including the switch, catch diode, and input capacitor is
the only one containing nanosecond rise and fall times. If
you follow this path on the PC layout, you will see that it is
irreducibly short. If you move the diode or input capacitor
away from the LT1506, get your resumé in order. The
other paths contain only some combination of DC and
500kHz triwave, so are much less critical.
Figure 5. Suggested Layout (Topside Only Shown)
Figure 6. High Speed Switching Path
1
U1
C1
CONNECT TO
GROUND PLANE
KEEP FB AND VC COMPONENTS
AWAY FROM HIGH FREQUENCY,
HIGH CURRENT COMPONENTS
PLACE FEEDTHROUGHS
AROUND GND PIN FOR GOOD
THERMAL CONDUCTIVITY
R3
D2
C4
R2
L1
1506 F05
C5
C6
GND
VOUT
D1
C3
VIN
GND
CONNECT TO
GROUND PLANE
MINIMIZE LT1506 C3, D1 LOOP
KELVIN SENSE
VOUT
TAKE OUTPUT
DIRECTLY FROM
END OF OUTPUT
CAPACITOR
1506 F06
5V
L1
VIN
HIGH
FREQUENCY
CIRCULATING
PATH
LOAD
SWITCH NODE



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