參數(shù)資料
型號(hào)： AAT2556
廠商： Advanced Analog Technology,lnc.
英文描述： Battery Charger and Step-Down Converter for Portable Applications
中文描述： 電池充電器和降壓轉(zhuǎn)換器為便攜式應(yīng)用
文件頁數(shù)： 21/29頁
文件大?。?/td> 708K
代理商： AAT2556
Adjustable Output Resistor Selection
Resistors R3 and R4 of Figure 5 program the out-
put to regulate at a voltage higher than 0.6V. To
limit the bias current required for the external feed-
back resistor string while maintaining good noise
immunity, the suggested value for R4 is 59k
Ω
.
Decreased resistor values are necessary to main-
tain noise immunity on the FB pin, resulting in
increased quiescent current. Table 4 summarizes
the resistor values for various output voltages.
With enhanced transient response for extreme
pulsed load application, an external feed-forward
capacitor (C5 in Figure 5) can be added.
Table 4: Adjustable Resistor Values For
Step-Down Converter.
R4 = 59k
Ω
R3 (k
Ω
)
19.6
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
124
137
187
267
R4 = 221k
Ω
R3 (k
Ω
)
75
113
150
187
221
261
301
332
442
464
523
715
1000
V
OUT
(V)
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2.0
2.5
3.3
R3 = V
·
R4 = 0.6V
·
59k
Ω
= 267k
Ω
REF
V
OUT
3.3V
AAT2556
Battery Charger and Step-Down
Converter for Portable Applications
2556.2006.09.1.2
21
Figure 5: AAT2556 Evaluation Board Schematic.
RED LED
D1
1K
R1
C1
10μF
C2
2.2μF
ADP
R2
8.06K
JP1
0
Ω
BAT
1 2 3
Enable_Buck
JP3
3μH
L1
100pF
C5
C4
4.7μF
VOUT
118k
R3
59k
R4
1 2 3
Buck Input
JP4
1 2
Enable_Bat
JP2
4.7uF
C3
VIN
BAT
5
6
FB
GND
ISET
1
2
3
4
ADP
STAT
8
7
9
GND
10
11
LX
12
AAT2556
U1
VOUT
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