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參數(shù)資料
| 型號(hào)： | AAT1156_07 |
| 廠商： | Advanced Analog Technology,lnc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 1MHz 700mA Step-Down DC-DC Converter |
| 中文描述： | 1MHz的700mA的降壓型DC - DC轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 12/15頁(yè) |
| 文件大?。?/td> | 586K |
| 代理商： | AAT1156_07 |
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AAT1156
1MHz 700mA Step-Down DC-DC Converter
12
1156.2007.01.1.4
Design Example
Specifications
I
OUT
0.7A
I
RIPPLE
40% of Full Load at Max V
IN
V
OUT
2.5V
V
IN
2.7V to 4.2V (3.6V nominal)
F
S
1MHz
T
AMB
85°C
Maximum Input Capacitor Ripple:
Inductor Selection:
Select Sumida inductor CDRH3D16 or CDRH4D28 4.7
μ
H.
V
V
2.5
V
2.5V
Δ
I = L
1 - V
1- 4.2V
F
S
IN
4.7
μ
H
1MHz
I
PK
= I
OUT
+
Δ
I = 0.7A + 0.11A = 0.81A
2
P = I
O
2
DCR = (0.7A)
2
80m
Ω
= 40mW
V
V
2.5
V
2.5V
L =
1 - =
1 - = 4.82
μ
H
I
O
k
F
S
V
IN
0.7A
0.3
1MHz
4.2V
1
0.34Arms, V
IN
= 2 · V
O
O
O
RMS
O
IN
IN
V
V
V
V
I
I
=
·
·
-
=
P = esr
·
I
RMS
2
= 5m
Ω
·
0.34
2
A = 0.6mW
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