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ACE725E bảng dữ liệu(PDF) 9 Page - ACE Technology Co., LTD.

tên linh kiện ACE725E
Giải thích chi tiết về linh kiện  24V , 1.2A High Efficiency Step-Down Converter
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nhà sản xuất  ACE [ACE Technology Co., LTD.]
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ACE725E
24V , 1.2A
High Efficiency Step-Down Converter
VER 1.1
9
Output Capacitor Selection
For
most applications a nominal 22μF or larger capacitor is suitable.
The ACE725E internal compensation is designed for a fixed corner frequency that is equal to
1
For example, for VOUT=5V, L=6.8μH,
C
OUT=22μF.
The output capacitor keeps output ripple small and ensures control-loop stability. The output capacitor
must also have low impedance at the switching frequency. Ceramic, polymer, and tantalum capacitors are
suitable, with ceramic exhibiting the lowest ESR and
high-frequency impedance. Output ripple with a
ceramic output capacitor is approximately as follows:
VRIPPLE = IL(PEAK)[1 / (2π x fOSC x COUT)]
If the capacitor has significant ESR, the output ripple component due to capacitor ESR is as follows:
VRIPPLE(ESR) = IL(PEAK) x ESR
Input Capacitor Selection
The input capacitor in a DC-to-DC converter reduces current peaks drawn from the battery or other
input power source and reduces switching noise in the controller. The impedance of the input capacitor at
the switching frequency should be less than that of the input source so high-frequency switching currents
do not pass through the input source. The output capacitor keeps output ripple small and ensures
control-loop stability.
Components Selection
VOUT (V)
COUT (μF)
L (μH)
8
22x2
10 to 15
5
22x2
6.8 to 10
3.3
22x2
4.7 to 10
2.5
22x2
3.3 to 10
FC=
2
∗ π√COUT∗ L=20Khz


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