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FR9855 bảng dữ liệu(PDF) 14 Page - Fitipower Integrated Technology Inc.

tên linh kiện FR9855
Giải thích chi tiết về linh kiện  18V, 5.5A Synchronous Step-Downn DC/DC Converter
PDF  16 Pages
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nhà sản xuất  FITIPOWER [Fitipower Integrated Technology Inc.]
Trang chủ  http://www.fitipower.com/en_US/index.asp
Logo FITIPOWER - Fitipower Integrated Technology Inc.

FR9855 bảng dữ liệu(HTML) 14 Page - Fitipower Integrated Technology Inc.

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14
FR9855-Preliminary 0.3-JAN-2016
FR9855
85T
Application Information (Continued)
PCB Layout Recommendation
The
device’s
performance
and
stability
is
dramatically
affected
by
PCB
layout.
It
is
recommended to follow these general guidelines
shown as below:
1. Place the input capacitors and output capacitors
as close to the device as possible. Trace to these
capacitors should be as short and wide as
possible to minimize parasitic inductance and
resistance.
2. Place feedback resistors close to the FB pin.
3. Keep the sensitive signal (FB) away from the
switching signal (LX).
4. The exposed pad of the package should be
soldered to an equivalent area of metal on the
PCB.
This area should connect to the GND
plane and have multiple via connections to the
back of the PCB as well as connections to
intermediate PCB layers.
The GND plane area
connecting
to
the
exposed
pad
should
be
maximized to improve thermal performance.
5. Multi-layer PCB design is recommended.
1
2
3
4
5
6
7
8
L1
LX
VOUT
VIN
Exposed
Pad
GND
C2
R1
R2
R3
C6
C5
C4
GND
R5
C1
C7
C3
Figure 28. Recommended PCB Layout Diagram for
SP Package
L1
LX
VOUT
VIN
GND
C2
R1
R2
R3
C7
C5
GND
C1
C8
8
1 2 3 4 5
6
7
9
10
Exposed
Pad
C4
C3
Figure 29. Recommended PCB Layout Diagram for
DA Package



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