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參數資料
| 型號： | ICL828 |
| 廠商： | Intersil Corporation |
| 英文描述： | Switched-Capacitor Voltage Inverter(DC-DC電壓變換器) |
| 中文描述： | 開關電容電壓逆變器（直流電壓變換器） |
| 文件頁數： | 6/7頁 |
| 文件大小： | 75K |
| 代理商： | ICL828 |
6
Voltage Splitting
The bidirectional characteristics of the switches of the
ICL828 can be used to split a higher supply in half as shown
below.
The combined load will be evenly shared between the two
external capacitors because the switches share the load in
parallel, the output resistance is approximately half of the
standard voltage inverter.
Equivalent Circuit
Typical value for R
OUT
in the above equivalent circuit would
be 6
to 7
for an input voltage of 5V. The power efficiency
for the circuit would be:
P
EFF
= (I
OUT
*V
OUT
)/(1/2(V
IN
*I
OUT
))+(V
IN
*I
Q
)
Typical values for ICL828 in this application,
I
Q
= 22
μ
A, R
OUT
= 6
to 7
and V
OUT
= 1/2V
IN
*R
LOAD
/(R
OUT
+ R
LOAD
).
The ICL828 used as a voltage splitting circuit is an efficient
means to providing a split supply application as shown in
Figures 16 through 19.
+V
IN
GND
(V
OUT
= 1/2V
IN
)
V
OUT
OUT
C1-
GND
INPUT
C+
C1 = C2 = C3 = 47
μ
F
C2
C3
C1
+
-
+
-
+
-
FIGURE 16. SPLIT SUPPLY APPLICATION
1/2
V
IN
R
OUT
FIGURE 17.
100
90
80
70
60
0
10
20
30
40
50
60
70
80
90
100
E
OUTPUT CURRENT (mA)
FIGURE 18. EFFICIENCY vs OUTPUT CURRENT FOR SPLIT
SUPPLY APPLICATION
0
10
20
30
40
50
60
70
80
90
100
1.5
1.7
1.9
2.1
2.3
2.5
O
OUTPUT CURRENT (mA)
V
IN
= 5V
FIGURE 19. OUTPUT CURRENT vs OUTPUT VOLTAGE FOR
SPLIT SUPPLY APPLICATIONS
ICL828
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