- 您現在的位置：買賣IC網 > PDF目錄369343 > 7660S (Intersil Corporation) Super Voltage Converter PDF資料下載
參數資料
| 型號： | 7660S |
| 廠商： | Intersil Corporation |
| 英文描述： | Super Voltage Converter |
| 中文描述： | 超電壓轉換器 |
| 文件頁數： | 8/9頁 |
| 文件大?。?/td> | 77K |
| 代理商： | 7660S |
3-43
Positive Voltage Doubling
The ICL7660S may be employed to achieve positive voltage
doubling using the circuit shown in Figure 20. In this
application, the pump inverter switches of the ICL7660S are
used to charge C
1
to a voltage level of V+ -V
F
(where V+ is
the supply voltage and V
F
is the forward voltage on C
1
plus
the supply voltage (V+) is applied through diode D
2
to
capacitor C
2
. The voltage thus created on C
2
becomes
(2V+) - (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, but for V+ = 5V and an output current of
10mA it will be approximately 60
.
Combined Negative Voltage Conversion and
Positive Supply Doubling
Figure 21 combines the functions shown in Figure 14 and
Figure 20 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 C2 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.
Voltage Splitting
The bidirectional characteristics can also be used to split a
high supply in half, as shown in Figure 22. The combined
load will be evenly shared between the two sides, and a high
value resistor to the LV pin ensures start-up. Because the
switches share the load in parallel, the output impedance is
much lower than in the standard circuits, and higher currents
can be drawn from the device. By using this circuit, and then
the circuit of Figure 17, +15V can be converted (via +7.5,
and -7.5 to a nominal -15V, although with rather high series
output resistance (
～
250
).
Regulated Negative Voltage Supply
In Some cases, the output impedance of the ICL7660S can
be a problem, particularly if the load current varies
substantially. The circuit of Figure 23 can be used to
overcome this by controlling the input voltage, via an
ICL7611 low-power CMOS op amp, in such a way as to
maintain a nearly constant output voltage. Direct feedback is
inadvisable, since the ICL7660S’s output does not respond
instantaneously to change in input, but only after the
switching delay. The circuit shown supplies enough delay to
accommodate the ICL7660S, while maintaining adequate
feedback. An increase in pump and storage capacitors is
desirable, and the values shown provides an output
impedance of less than 5
to a load of 10mA.
1
2
3
4
8
7
6
5
+
-
ICL7660S
V
OUT
V+
+
-
C
2
C
1
C
OSC
FIGURE 16. LOWERING OSCILLATOR FREQUENCY
1
2
3
4
8
7
6
5
ICL7660S
V+
D
1
D
2
C
1
C
2
V
OUT
=
(2V+)
-
(2V
F
)
+
-
+
-
NOTE: D
1
and D
2
can be any suitable diode.
FIGURE 17. POSITIVE VOLTAGE DOUBLER
1
2
3
4
8
7
6
5
ICL7660S
V+
D
1
D
2
C
4
V
OUT
= (2V+) -
(V
FD1
) - (V
FD2
)
+
-
C
2
+
-
C
3
+
-
V
OUT
= -V
IN
C
1
+
-
FIGURE 18. COMBINED NEGATIVE VOLTAGE CONVERTER
AND POSITIVE DOUBLER
1
2
3
4
8
7
6
5
+
-
+
-
50
μ
F
50
μ
F
+
-
50
μ
F
R
L1
V
OUT
=V+
-
V
-
2
ICL7660S
V+
V-
R
L2
FIGURE 19. SPLITTING A SUPPLY IN HALF
ICL7660S
相關PDF資料 |
PDF描述 |
|---|---|
| 766101 | Pulse Transformers |
| 766001 | Wallmount ULTRX Series Fiberglass Enclosure; NEMA Type:1, 2, 4, 4X, 12, 13; Enclosure Material:Fiberglass; External Height:30.51"; External Width:24.11"; External Depth:12.64"; Enclosure Color:Light Gray RoHS Compliant: No |
| 766002 | Pulse Transformers |
| 766003 | Pulse Transformers |
| 766004 | Pulse Transformers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 7660SCBA | 制造商:Harris Corporation 功能描述: |
| 7660SCPA | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Harris Corporation 功能描述: |
| 7660SIBA | 制造商: 功能描述: 制造商:undefined 功能描述: |
| 7661 | 功能描述:支架與墊片 CERAMIC THRD .500 RoHS:否 制造商:Schurter 類型:Transipillar Spacers 長度:16 m 螺紋大小:M4 外徑:10 mm 材料:Nylon with Steel 電鍍:Zinc |
| 7661 WH001 | 功能描述:2 (1 Pair Twisted) Conductor Multi-Conductor Cable White 20 AWG Braid 1000' (304.80m) 制造商:alpha wire 系列:- 零件狀態:有效 電纜類型:多芯 導體數:2（1 對雙絞線） 線規:20 AWG 導線股數:7/28 導體材料:銅，鍍錫 護套（絕緣）材料:聚氯乙烯（PVC） 護套（絕緣）直徑:0.130"（3.30mm） 屏蔽類型:編織線 長度:1000'（304.80m） 套管顏色:白 等級:- 特性:- 電壓:600V 工作溫度:-55°C ~ 105°C 使用:- 導體絕緣:聚氯乙烯（PVC） 護套（絕緣）厚度:0.025"（0.63mm） 屏蔽材料:銅，鍍錫 屏蔽范圍:90% 標準包裝:1 |
發布緊急采購，3分鐘左右您將得到回復。