參數(shù)資料
型號(hào): AAT1149IJS-0.6-T1
廠商: Advanced Analog Technology,lnc.
英文描述: 3MHz Fast Transient 400mA Step-Down Converter
中文描述: 3MHz的快速瞬態(tài)400mA的降壓轉(zhuǎn)換器
文件頁數(shù): 17/20頁
文件大?。?/td> 1800K
代理商: AAT1149IJS-0.6-T1
AAT1149
3MHz Fast Transient
400mA Step-Down Converter
1149.2006.11.1.0
17
Input Capacitor
Input Ripple V
PP
= 25mV
AAT1149 Losses
T
J(MAX)
= T
AMB
+
Θ
JA
· P
LOSS
= 85
°
C + (160
°
C/W) · 140mW = 107
°
C
P
TOTAL
+ (t
sw
· F
S
· I
O
+ I
Q
) · V
IN
I
O
2
· (R
DS(ON)H
· V
O
+ R
DS(ON)L
· [V
IN
-V
O
]
)
V
IN
=
=
+ (5ns · 3MHz · 0.4A + 70
μ
A) · 4.2V = 140mW
0.4
2
· (0.725
Ω
·
1.8V + 0.7
Ω
·
[4.2V - 1.8V])
4.2V
I
O
2
RMS
I
P = esr
·
I
RMS
2
= 5m
Ω
·
(0.2A)
2
= 0.2mW
=
= 0.2Arms
C
IN
=
=
= 1.45
μ
F; use 2.2
μ
F
1
- ESR
·
4
·
F
S
V
PP
I
O
1
- 5m
Ω
·
4
·
3.0MHz
0.4A
25mV
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