參數(shù)資料
型號(hào)： TC1121EOAG
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHED CAPACITOR CONVERTER, 200 kHz SWITCHING FREQ-MAX, PDSO8
封裝： SOIC-8
文件頁(yè)數(shù)： 11/14頁(yè)
文件大?。?/td> 497K
代理商： TC1121EOAG
TC1121
DS21358C-page 6
2006 Microchip Technology Inc.
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:
Cascading TC1121s to Increase Output Voltage
FIGURE 3-3:
Paralleling TC1121s to Reduce Output Resistance
C1
C1n
4
3
2
3
5
8
7
5
2
C2
VIN
+
C2n
TC1121
GND
OSC
CAP+
CAP–
FC
SHDN
VOUT
VIN
VOUT
VIN
SHDN
SHDN*
“1”
“n”
+
*SHDN should be tied to VIN if not used.
C1
C1n
4
3
2
3
5
8
7
5
2
C2
V+IN
TC1121
GND
OSC
CAP+
CAP–
FC
SHDN
VOUT
VIN
SHDN
SHDN*
*SHDN should be tied to VIN if not used.
“1”
“n”
+
7
OSC
ROUT = ROUT (of TC1121)/n(number of devices)
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