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參數(shù)資料
| 型號： | TC1240 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package(159kHz開關頻率,帶關斷DC-DC) |
| 中文描述： | 積極加倍電荷泵與關機采用SOT - 23封裝（159kHz開關頻率，帶關斷的DC - DC） |
| 文件頁數(shù)： | 8/16頁 |
| 文件大小： | 355K |
| 代理商： | TC1240 |
TC1240/TC1240A
DS21516C-page 8
2003 Microchip Technology Inc.
The switching frequency in Equation 5-1b is defined as
one-half the oscillator frequency (i.e., F
SW
= F
OSC
/2).
The 1/(F
SW
)(C
1
) term in Equation 5-1b is the effective
output resistance of an ideal switched capacitor circuit
(Figure 5-1 and Figure 5-2).
The output voltage ripple is given by Equation 5-2.
EQUATION 5-2:
FIGURE 5-1:
Model.
Ideal Switched Capacitor
FIGURE 5-2:
Resistance.
Equivalent Output
5.3
Capacitor Selection
In order to maintain the lowest output resistance and
output ripple voltage, it is recommended that low ESR
capacitors be used. Additionally, larger values of C
1
will
lower the output resistance and larger values of C
2
will
reduce output ripple (see Equation 5-1b).
Table 5-1 shows various values of C
1
and the
corresponding output resistance values @ +25°C. It
assumes a 0.1
ESR
C1
and 0.9
R
SW
. Table 5-2
shows the output voltage ripple for various values of
C
2
. The V
RIPPLE
values assume 5mA output load
current and 0.1
ESR
C2
.
TABLE 5-1:
OUTPUT RESISTANCE
VS. C
1
(ESR = 0.1
)
TC1240
R
OUT
(
)
47
28.5
19.5
17
15.5
13.6
12.5
12.2
TABLE 5-2:
OUTPUT VOLTAGE RIPPLE
VS. C
2
(ESR = 0.1
)
I
OUT
5 mA
TC1240/TC1240A
V
RIPPLE
(mV)
VRIPPLE
2 FSW
C2
(
)
---------IOUT
2 IOUT
)
ESRC2
(
)
+
=
V+
V
OUT
R
L
C
2
C
1
f
F
SW
x C
1
1
V+
V
OUT
R
EQUIV
R
EQUIV
=
R
L
C
2
C
1
(μF)
TC1240A
R
OUT
(
)
35
20.5
14
12
10.5
9.3
8.3
8.1
0.47
1
2.2
3.3
4.7
10
47
100
C
1
(μF)
0.47
1
2.2
3.3
4.7
10
47
100
142
67
30
20
14
6.7
2.5
1.6
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|---|---|
| TC1240_13 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package |
| TC1240A | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package |
| TC1240AECH | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package |
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| TC1240AI/CHTR | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package |
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