TC1121 查看數據表（PDF） - Microchip Technology
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TC1121 Datasheet PDF : 14 Pages
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TC1121
3.4 Cascading Devices
To produce greater negative magnitudes of the initial
supply voltage, the TC1121 may be cascaded (see
Figure 3-2). Resulting output resistance is approxi-
mately equal to the sum of individual TC1121 ROUT
values. The output voltage (where n is an integer
representing the number of devices cascaded) is
defined by VOUT = -n (VIN).
3.5 Paralleling Devices
To reduce output resistance, multiple TC1121s may be
paralleled (see Figure 3-3). Each device needs a pump
capacitor C1, but the reservoir capacitor C2 serves all
devices. The value of C2 should be increased by a
factor of n (the number of devices).
FIGURE 3-2:
+
C1
VI+N
FC
VIN 8
2 CAP+
OSC
TC1121
3 GND
SHDN
+
C1n
SHDN*
4 CAP– VOUT 5
“1”
C2
+
FC
VIN 8
2 CAP+
OSC 7
TC1121
3
GND
SHDN
4 CAP–
VOUT 5
“n”
SHDN*
VOUT
C2n
+
*SHDN should be tied to VIN if not used.
Cascading TC1121s to Increase Output Voltage
+
C1
V+IN
FC
VIN 8
2 CAP+
OSC 7 OSC
TC1121
3 GND
SHDN
C1n +
SHDN*
4 CAP– VOUT 5
“1”
FC
VIN 8
2 CAP+
OSC 7
TC1121
3
GND
SHDN
4 CAP–
VOUT 5
“n”
SHDN*
C2
+
ROUT = ROUT (of TC1121)/n(number of devices)
*SHDN should be tied to VIN if not used.
FIGURE 3-3:
Paralleling TC1121s to Reduce Output Resistance
DS21358C-page 6
© 2006 Microchip Technology Inc.
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