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TL7660 Datasheet(PDF) 10 Page - Texas Instruments

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Part # TL7660
Description  CMOS VOLTAGE CONVERTER
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TL7660 Datasheet(HTML) 10 Page - Texas Instruments

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Output Ripple
A
B
0
V
t
2
t
1
–V+
Paralleling Devices
+
-
1
2
3
4
8
7
6
5
TL7660
"1"
1
2
3
4
8
7
6
5
TL7660
"n"
+
-
+
+
-
V+
C
1
C
2
R
L
C
1
TL7660
CMOS VOLTAGE CONVERTER
SCAS794 – JUNE 2006
APPLICATION INFORMATION (continued)
ESR also affects the ripple voltage seen at the output. The total ripple is determined by two voltages, A and B,
as shown in Figure 4. Segment A is the voltage drop across the ESR of C2 at the instant it goes from being
charged by C1 (current flow into C2) to being discharged through the load (current flowing out of C2). The
magnitude of this current change is 2
× I
OUT, hence the total drop is 2 × IOUT × eSRC2 V. Segment B is the
voltage change across C2 during time t2, the half of the cycle when C2 supplies current to the load. The drop at
B is IOUT × t2/C2 V. The peak-to-peak ripple voltage is the sum of these voltage drops:
VRIPPLE ≈ (1/(2fPUMPC2) + 2(ESRC2)) × IOUT
Again, a low ESR capacitor results in a higher performance output.
Figure 4. Output Ripple
Any number of TL7660 voltage converters may be paralleled to reduce output resistance (see Figure 5). The
reservoir capacitor, C2, serves all devices, while each device requires its own pump capacitor, C1. The resultant
output resistance would be approximately:
ROUT = ROUT (of TL7660)/n (number of devices)
Figure 5. Paralleling Devices
10
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