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TC1121EOA Datasheet(PDF) 7 Page - Microchip Technology

No. de pieza TC1121EOA
Descripción Electrónicos  100mA Charge Pump Voltage Converter with Shutdown
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC1121EOA Datasheet(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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