參數(shù)資料
型號: AAT1120
廠商: Advanced Analog Technology,lnc.
英文描述: 500mA Step-Down Converter
中文描述: 500mA的降壓轉(zhuǎn)換器
文件頁數(shù): 16/20頁
文件大小: 705K
代理商: AAT1120
AAT1120
500mA Step-Down Converter
16
1120.2007.01.1.0
Input Capacitor
Input Ripple V
PP
= 25mV
AAT1120 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
DS(ON)H
· V
O
+ R
DS(ON)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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