參數(shù)資料
型號: AAT1145IDE-1.8-T1
廠商: Advanced Analogic Technologies, Inc.
英文描述: 1.2A Step-Down Converter
中文描述: 1.2A的降壓轉(zhuǎn)換器
文件頁數(shù): 15/16頁
文件大?。?/td> 307K
代理商: AAT1145IDE-1.8-T1
AAT1145
1.2A Step-Down Converter
SwitchReg
TM
PRODUCT DATASHEET
1145.2007.11.1.1
15
w w w . a n a l o g i c t e c h . c o m
Input Capacitor
Input ripple V
PP
= 25mV
C
IN(MIN)
= = = 15.4μF; use 22μF
- ESR
·
4
·
f
S
I
O
1.2
1
V
PP
1
- 0.01
·
4
·
1.5
·
10
6
0.025
I
O
2
RMS
I
P
CIN
= ESR
·
I
RMS
2
= 0.01
·
0.6
2
= 3.6mW
1.2
2
=
=
= 600mArms
AAT1145 Losses
P
TOTAL
= I
O
2
· R
DS(ON)P
· D + I
O
2
· R
DS(ON)N
· (1 - D) + (t
SW
· f
S
· I
O
) · V
IN
= 1.2
2
· 0.207 ·
+ 1.2
2
· 0.146 · 1 -
1.8
4.2
+ (5 · 10
-9
· 1.5 · 10
6
· 1.2) · 4.2 = 286mW
1.8
4.2
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