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ACE722G bảng dữ liệu(PDF) 11 Page - ACE Technology Co., LTD.

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Giải thích chi tiết về linh kiện  5V 2.0A, 1.3MHz Synchronous Buck Converter
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ACE722G
5V 2.0A, 1.3MHz
Synchronous Buck Converter
VER 1.1
11
Output Capacitor and Inductor Selection
Follow the below table for Inductor and Output cap selection:
VOUT
1.2V
1.5V
1.8V
2.5V
3.3V
COUT
33
F
33
F
22
F
22
F
10
F
L
1.5
H
1.5
H
2.2
H
3.3
H
4.7
H
If much smaller values are used, inductor current rises, and a larger output capacitance may be required
to suppress output ripple. Larger values than LIDEAL can be used to obtain higher output current, but
typically with larger inductor size.
Application Information
Layout is critical to achieve clean and stable operation. The switching power stage requires particular
attention. Follow these guidelines for good PC board layout:
(1) Place decoupling capacitors as close to the IC as possible
(2) Connect input and output capacitors to the same power ground node with a star ground configuration
then to IC ground.
(3) Keep the high-current paths as short and wide as possible. Keep the path of switching current
(C1 to IN and C1 to GND) short. Avoid vias in the switching paths.
(4) If possible, connect IN, SW, and GND separately to a large copper area to help cool the IC to further
improve efficiency and long-term reliability.
(5) Ensure all feedback connections are short and direct. Place the feedback resistors as close to the IC
as possible.
(6) Route high-speed switching nodes away from sensitive analog area.


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