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TC1240ECHTR Folha de dados(PDF) 8 Page - Microchip Technology

Nome de Peças TC1240ECHTR
Descrição Electrónicos  Positive Doubling Charge Pumps with Shutdown in a SOT-23 Package
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Fabricante Electrônico  MICROCHIP [Microchip Technology]
Página de início  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1240ECHTR Folha de dados(HTML) 8 Page - Microchip Technology

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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., FSW = FOSC/2).
The 1/(FSW)(C1) 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:
Ideal Switched Capacitor
Model.
FIGURE 5-2:
Equivalent Output
Resistance.
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 C1 will
lower the output resistance and larger values of C2 will
reduce output ripple (see Equation 5-1b).
Table 5-1 shows various values of C1 and the
corresponding output resistance values @ +25°C. It
assumes a 0.1
Ω ESRC1 and 0.9Ω RSW. Table 5-2
shows the output voltage ripple for various values of
C2. The VRIPPLE values assume 5mA output load
current and 0.1
Ω ESRC2.
TABLE 5-1:
OUTPUT RESISTANCE
VS. C1 (ESR = 0.1Ω)
TABLE 5-2:
OUTPUT VOLTAGE RIPPLE
VS. C2 (ESR = 0.1Ω)
IOUT 5mA
VRIPPLE
IOUT
2FSW
() C2
()
-------------------------------- 2IOUT
() ESRC2
()
+
=
V+
VOUT
RL
C2
C1
f
FSW x C1
1
V+
VOUT
REQUIV
REQUIV =
RL
C2
C1 (µF)
TC1240
ROUT(Ω)
TC1240A
ROUT(Ω)
0.47
47
35
1
28.5
20.5
2.2
19.5
14
3.3
17
12
4.7
15.5
10.5
10
13.6
9.3
47
12.5
8.3
100
12.2
8.1
C1 (µF)
TC1240/TC1240A
VRIPPLE (mV)
0.47
142
167
2.2
30
3.3
20
4.7
14
10
6.7
47
2.5
100
1.6


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