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參數(shù)資料
| 型號(hào)： | ICL7660A |
| 廠商： | Intersil Corporation |
| 英文描述： | CMOS Voltage Converters(CMOS電壓變換器) |
| 中文描述： | CMOS電壓轉(zhuǎn)換器（的CMOS電壓變換器） |
| 文件頁(yè)數(shù)： | 8/11頁(yè) |
| 文件大?。?/td> | 275K |
| 代理商： | ICL7660A |
8
FN3072.7
October 10, 2005
Typical Applications
Simple Negative Voltage Converter
The majority of applications will undoubtedly utilize the ICL7660
and ICL7660A for generation of negative supply voltages.
Figure 13 shows typical connections to provide a negative
supply negative (GND) for supply voltages below 3.5V.
The output characteristics of the circuit in Figure 13A can be
approximated by an ideal voltage source in series with a
resistance as shown in Figure 13B. The voltage source has
a value of -V+. The output impedance (R
O
) is a function of
the ON resistance of the internal MOS switches (shown in
Figure 12), the switching frequency, the value of C
1
and C
2
,
and the ESR (equivalent series resistance) of C1 and C2. A
good first order approximation for R
O
is:
RSW, the total switch resistance, is a function of supply
voltage and temperature (See the Output Source Resistance
graphs), typically 23
at 25°C and 5V. Careful selection of
C
1
and C
2
will reduce the remaining terms, minimizing the
output impedance. High value capacitors will reduce the
1/(f
PUMP
C
1
) component, and low ESR capacitors will
lower the ESR term. Increasing the oscillator frequency will
reduce the 1/(f
PUMP
C1) term, but may have the side effect
of a net increase in output impedance when C
1
> 10
μ
F and
there is no longer enough time to fully charge the capacitors
FIGURE 14. OUTPUT RIPPLE
FIGURE 15. PARALLELING DEVICES
FIGURE 16. CASCADING DEVICES FOR INCREASED OUTPUT VOLTAGE
A
t
2
t
1
B
0
-(V+)
V
1
2
3
4
8
7
6
5
ICL7660
ICL7660A
“1”
V+
C
1
1
2
3
4
8
7
6
5
ICL7660
ICL7660A
“n”
C
1
R
L
+
-
C
2
1
2
3
4
8
7
6
5
V+
1
2
3
4
8
7
6
5
10
μ
F
+
-
10
μ
F
+
-
10
μ
F
+
-
10
μ
F
+
-
V
OUT
=
-
nV
+
ICL7660
ICL7660A
“n”
ICL7660
ICL7660A
“1”
R
O
2(R
SW1
+ R
SW3
+ ESR
C1
) +
2(R
SW2
+ R
SW4
+ ESR
C1
) +
1
+ ESR
C2
(f
PUMP
) (C1)
f
OSC
2
(f
PUMP
=
, R
SWX
= MOSFET switch resistance)
Combining the four R
SWX
terms as R
SW
, we see that:
R
O
2 (R
SW
) +
1
+ 4 (ESR
C1
) + ESR
C2
(f
PUMP
) (C1)
R
O
2(R
SW1
+ R
SW3
+ ESR
C1
) +
ICL7660, ICL7660A
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ICL7660 | CMOS Voltage Converters(CMOS電壓變換器) |
| ICL7660EPA | Switched-Capacitor Voltage Converters |
| ICL7660ESA | Switched-Capacitor Voltage Converters |
| ICL7660CSA | Switched-Capacitor Voltage Converters |
| ICL7660AMJA⒂ | Switched-Capacitor Voltage Converters |
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