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參數(shù)資料
| 型號： | ICL828IH-T |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 5/7頁 |
| 文件大小： | 103K |
| 代理商： | ICL828IH-T |
5
load. The drop at B is I
OUT
x t
1
/C
2
V. The peak-to-peak
ripple voltage is the sum of these voltage drops:
Again, a low ESR capacitor will result in a higher
performance output.
Positive Voltage Doubling
The ICL828 may be employed to achieve positive voltage
doubling using the circuit shown in Figure 13. In this
application, the pump inverter switches of the ICL828 are
used to charge C
1
to a voltage level of V
IN
-V
F
where V
IN
is
the supply voltage and V
F
is the forward voltage on C
1
plus
the supply voltage (V
IN
) is applied through diode D
2
to
capacitor C
2
. The voltage thus created on C
2
becomes
(2V
IN
) - (2V
F
) or twice the supply voltage minus the
combined forward voltage drops of diodes D
1
and D
2
.
The source impedance of the output (V
OUT
) will depend on
the output current.
Combined Negative Conversion and
Positive Supply Doubling
Figure 14 combines the functions shown on front page and
Figure 13 to provide negative voltage conversion and
positive voltage doubling simultaneously. This approach
would be, for example, suitable for generating +9V and -5V
from an existing +5V supply. In this instance capacitors C
1
and C
3
perform the pump and reservoir functions
respectively for the generation of the negative voltage, while
capacitors C
2
and C
4
are pump and reservoir respectively
for the doubled positive voltage. There is a penalty in this
configuration which combines both functions, however, in
that the source impedances of the generated supplies will be
somewhat higher due to the finite impedance of the common
charge pump driver at pin 2 of the device.
Cascading Devices
The ICL828 may be cascaded to produce a larger
multiplication supply voltage (see Figure 15). The output
voltage is:
V
OUT
= -n(V
IN
),
where n is an integer representing the number of devices
cascaded.
The resulting output resistance would be approximately the
sum of the individual ICL828 R
OUT
values.
V
RIPPLE
------------------------------------------
2 ESRC2
IOUT
×
+
A
t
1
B
0
-(V
IN
)
V
FIGURE 12. OUTPUT RIPPLE
D
1
D
2
C
2
V
OUT
=
(2V
IN
)
-
(2V
F
)
+
-
1
2
3
4
5
V+
+
C
1
-
NOTE: D
1
and D
2
can be any suitable diode.
FIGURE 13. POSITIVE VOLTAGE DOUBLER
D
1
D
2
C
4
V
OUT
= (2V
IN
) -
(V
FD1
) - (V
FD2
)
+
-
C
3
+
-
V
OUT
= -V
IN
FIGURE 14. COMBINED NEGATIVE VOLTAGE AND POSITIVE
DOUBLER
1
2
3
4
5
C
2
+
-
C
1
V
IN
+
-
1
2
3
5
4
C1-
IN
OUT
C1+
GND
1
3
5
4
C1-
IN
OUT
C1+
+
+V
IN
C
2
+
+
V
OUT
+
V
OUT
= - nV
IN
2
GND
n
1
FIGURE 15. CASCADING TO INCREASE OUTPUT VOLTAGE
C
1
C
4
C
3
ICL828
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