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參數(shù)資料
| 型號(hào)： | LT1144 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Octal Bus Transceivers With 3-State Outputs 20-PDIP 0 to 70 |
| 中文描述： | 開關(guān)電容寬輸入范圍電壓轉(zhuǎn)換器，帶有關(guān)斷 |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 206K |
| 代理商： | LT1144 |
7
LTC1144
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
S
A
O
PPLICATI
TYPICAL
Negative Voltage Converter
Figure 8 shows a typical connection which will provide a
negative supply from an available positive supply. This
circuit operates over full temperature and power supply
ranges without the need of any external diodes.
The output voltage (pin 5) characteristics of the circuit are
those of a nearly ideal voltage source in series with a 56
resistor. The 56
output impedance is composed of two
terms: 1) the equivalent switched capacitor resistance
(see Theory of Operation), and 2) a term related to the on-
resistance of the MOS switches.
Figure 9. Voltage Doubler
1
2
3
4
8
7
6
5
+
+
+
+
V
2V TO 18V
V
OUT
= 2(V
IN
– 1)
10
μ
F
10
μ
F
V
d
1N4148
V
d
1N4148
1144 F09
LTC1144
Ultra-Precision Voltage Divider
An ultra-precision voltage divider is shown in Figure 10. To
achieve the 0.0002% accuracy indicated, the load current
should be kept below 100nA. However, with a slight loss
in accuracy, the load current can be increased.
At an oscillator frequency of 10kHz and C1 = 10
μ
F, the first
term is:
1
2
1
5 10
/
R
f
C
EQUIV
OSC
=
(
)
×
=
×
=
1
10 10
20
3
6
Notice that the above equation for R
EQUIV
is nota capaci-
tive reactance equation (X
C
= 1/
ω
C) and does not contain
a 2
π
term.
The exact expression for output impedance is extremely
complex, but the dominant effect of the capacitor is clearly
shown in Figure 5. For C1 = C2 = 10
μ
F, the output
impedance goes from 56
at f
OSC
= 10kHz to 250
at
f
OSC
= 1kHz. As the 1/(f
×
C) term becomes large compared
to the switch on-resistance term, the output resistance is
determined by 1/(f
×
C) only.
Voltage Doubling
Figure 9 shows a two-diode capacitive voltage doubler.
With a 15V input, the output is 29.45V with no load and
28.18V with a 10mA load.
Figure 8. Negative Voltage Converter
1
2
3
4
8
7
6
5
+
+
10
μ
F
10
μ
F
V
+
2V TO 18V
V
OUT
= –V
+
T
MIN
≤
T
A
≤
T
MAX
1144 F08
LTC1144
1
2
3
4
8
7
6
5
+
+
C2
10
μ
F
C1
10
μ
F
V
+
4V TO 36V
1144 F10
LTC1144
±0.002%
T
MIN
≤
T
A
≤
T
MAX
I
L
≤
100nA
V+
2
Figure 10. Ultra-Precision Voltage Divider
Battery Splitter
A common need in many systems is to obtain (+) and (–
)
supplies from a single battery or single power supply
system. Where current requirements are small, the circuit
shown in Figure 11 is a simple solution. It provides
symmetrical
±
output voltages, both equal to one half the
input voltage. The output voltages are both referenced to
pin 3 (output common).
1
2
3
4
8
7
6
5
+
+
C2
10
μ
F
C1
10
μ
F
OUTPUT
COMMON
V
B
/2
9V
–V
B
/2
–9V
1144 F11
LTC1144
V
B
18V
+
Figure 11. Battery Splitter
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