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參數(shù)資料
| 型號(hào)： | ICL7660 |
| 廠商： | Intersil Corporation |
| 英文描述： | CMOS Voltage Converters(CMOS電壓變換器) |
| 中文描述： | 開關(guān)電容電壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 6/11頁 |
| 文件大?。?/td> | 275K |
| 代理商： | ICL7660 |
6
FN3072.7
October 10, 2005
Detailed Description
The ICL7660 and ICL7660A contain all the necessary
circuitry to complete a negative voltage converter, with the
exception of 2 external capacitors which may be inexpensive
10
μ
F polarized electrolytic types. The mode of operation of
the device may be best understood by considering Figure
12, which shows an idealized negative voltage converter.
Capacitor C
1
is charged to a voltage, V+, for the half cycle
when switches S
1
and S
3
are closed. (Note: Switches S
2
and S
4
are open during this half cycle.) During the second
half cycle of operation, switches S
2
and S
4
are closed, with
S
1
and S
3
open, thereby shifting capacitor C
1
negatively by
V+ volts. Charge is then transferred from C
1
to C
2
such that
the voltage on C
2
is exactly V+, assuming ideal switches and
no load on C
2
. The ICL7660 approaches this ideal situation
more closely than existing non-mechanical circuits.
In the ICL7660 and ICL7660A, the 4 switches of Figure 12
are MOS power switches; S
1
is a P-Channel device and S
2
,
S
3
and S
4
are N-Channel devices. The main difficulty with
this approach is that in integrating the switches, the
substrates of S
3
and S
4
must always remain reverse biased
with respect to their sources, but not so much as to degrade
their “ON” resistances. In addition, at circuit start-up, and
under output short circuit conditions (V
OUT
= V+), the output
voltage must be sensed and the substrate bias adjusted
accordingly. Failure to accomplish this would result in high
power losses and probable device latchup.
This problem is eliminated in the ICL7660 and ICL7660A by a
logic network which senses the output voltage (V
OUT
) together
with the level translators, and switches the substrates of S
3
and
S
4
to the correct level to maintain necessary reverse bias.
FIGURE 9. OUTPUT VOLTAGE AS A FUNCTION OF OUTPUT
CURRENT
FIGURE 10. SUPPLY CURRENT AND POWER CONVERSION
EFFICIENCY AS A FUNCTION OF LOAD
CURRENT
NOTE:
6. These curves include in the supply current that current fed directly into the load R
L
from the V+ (See Figure 11). Thus, approximately half the
supply current goes directly to the positive side of the load, and the other half, through the ICL7660/ICL7660A, to the negative side of the load.
Ideally, V
OUT
～
2V
IN
, I
S
～
2I
L
, so V
IN
x I
S
～
V
OUT
x I
L
.
NOTE: For large values of C
OSC
(>1000pF) the values of C
1
and C2 should be increased to 100
μ
F.
FIGURE 11. ICL7660, ICL7660A TEST CIRCUIT
Typical Performance Curves
(Test Circuit of Figure 11)
(Continued)
T
A
= 25
°C
V+ = 2V
+2
+1
0
-1
-2
SLOPE 150
0
1
2
3
4
5
6
7
8
LOAD CURRENT I
L
(mA)
O
100
90
80
70
60
50
40
30
20
10
0
P
P
EFF
I+
LOAD CURRENT I
L
(mA)
0
1.5
3.0
4.5
6.0
7.5
9.0
20.0
18.0
16.0
14.0
12.0
10.0
8.0
6.0
4.0
2.0
0
S
T
A
= 25
°C
V
+
= 2V
1
2
3
4
8
7
6
5
+
-
C
1
10
μ
F
I
S
V+
(+5V)
I
L
R
L
-V
OUT
C
2
10
μ
F
ICL7660
ICL7660A
C
OSC
(NOTE)
+
-
ICL7660, ICL7660A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ICL7660EPA | Switched-Capacitor Voltage Converters |
| ICL7660ESA | Switched-Capacitor Voltage Converters |
| ICL7660CSA | Switched-Capacitor Voltage Converters |
| ICL7660AMJA⒂ | Switched-Capacitor Voltage Converters |
| ICL7660AMTV⒂ | Switched-Capacitor Voltage Converters |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICL7660 DIE | 制造商:Harris Corporation 功能描述: |
| ICL7660ACBA | 功能描述:電荷泵 CMOS VAGE CNVRTR COM RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| ICL7660ACBA-T | 功能描述:電荷泵 CMOS VAGE CNVRTR COM TAPE RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| ICL7660ACBAZ | 制造商:Intersil 功能描述:Bulk |
| ICL7660ACBAZA | 功能描述:電荷泵 W/ANNEAL CMOS VOLT CONVRTR 8 COM RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
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