參數(shù)資料
型號(hào): AAT2554
廠商: Advanced Analog Technology,lnc.
英文描述: Total Power Solution for Portable Applications
中文描述: 總功率便攜式應(yīng)用解決方案
文件頁數(shù): 29/33頁
文件大?。?/td> 877K
代理商: AAT2554
AAT2554
Total Power Solution for Portable Applications
2554.2007.01.1.2
29
Input Capacitor
Input Ripple V
PP
= 25mV
AAT2554 Losses
T
J(MAX)
= T
AMB
+
Θ
JA
· P
LOSS
= 85
°
C + (50
°
C/W) · 26.14mW = 86.3
°
C
P
TOTAL
+ (t
sw
· F
S
· I
O
+ I
Q
) · V
IN
I
O
2
· (R
DSON(H)
· V
O
+ R
DSON(L)
· [V
IN
-V
O
]
)
V
IN
=
=
+ (5ns · 1.5MHz · 0.2A + 30μA) · 4.2V = 26.14mW
0.2
2
· (0.59
Ω
·
1.8V + 0.42
Ω
·
[4.2V - 1.8V])
4.2V
I
O
2
RMS
I
P = esr
·
I
RMS
2
= 5m
Ω
·
(0.1A)
2
= 0.05mW
=
= 0.1Arms
C
IN
=
=
= 1.38μF (use 4.7μF)
1
- ESR
·
4
·
F
S
V
PP
I
O
1
- 5m
Ω
·
4
·
1.5MHz
0.2A
25mV
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