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TC1121EPA Folha de dados(PDF) 7 Page - Microchip Technology

Nome de Peças TC1121EPA
Descrição Electrónicos  100mA Charge Pump Voltage Converter with Shutdown
PDF  14 Pages
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Fabricante Electrônico  MICROCHIP [Microchip Technology]
Página de início  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1121EPA Folha de dados(HTML) 7 Page - Microchip Technology

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© 2006 Microchip Technology Inc.
DS21358C-page 7
TC1121
3.6
Combined Positive Supply
Multiplication and Negative
Voltage Conversion
Figure 3-4 shows this dual function circuit, in which
capacitors C1 and C2 perform pump and reservoir
functions to generate negative voltage. Capacitors C3
and C4 are the respective capacitors for multiplied
positive voltage. This particular configuration leads to
higher source impedances of the generated supplies
due
to
the
finite
impedance
of
the
common
charge-pump driver.
FIGURE 3-4:
Combined Positive Multiplier and Negative Converter
C1
D1
D2
D1, D2 = 1N4148
4
3
6
8
5
2
C2
C4
C3
VIN
+
VOUT = (2VIN) –
(VFD1) – (VFD2)
TC1121
GND
OSC
CAP+
CAP–
FC
SHDN
VOUT
VIN
SHDN*
VOUT = VIN
–
*SHDN should be tied to VIN if not used.
+
+
+
+



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