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TC7660 Fiches technique(PDF) 9 Page - Microchip Technology

No de pièce TC7660
Description  Charge Pump DC-to-DC Voltage Converter
Download  18 Pages
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC7660 Fiches technique(HTML) 9 Page - Microchip Technology

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 2002 Microchip Technology Inc.
DS21465B-page 9
TC7660
FIGURE 5-7:
Combined Negative
Converter And Positive Multiplier.
5.7
Efficient Positive Voltage
Multiplication/Conversion
Since the switches that allow the charge pumping
operation are bidirectional, the charge transfer can be
performed
backwards
as
easily
as
forwards.
Figure 5-8 shows a TC7660 transforming -5V to +5V
(or +5V to +10V, etc.). The only problem here is that the
internal clock and switch-drive section will not operate
until some positive voltage has been generated. An ini-
tial inefficient pump, as shown in Figure 5-7, could be
used to start this circuit up, after which it will bypass the
other (D1 and D2 in Figure 5-7 would never turn on), or
else the diode and resistor shown dotted in Figure 5-8
can be used to "force" the internal regulator on.
FIGURE 5-8:
Positive Voltage
Conversion.
+
C1
D1
+
+
C3
C4
C2
D2
+
VOUT =
1
2
3
4
8
7
6
5
TC7660
V+
(2 V+) - (2 VF)
VOUT
= -V+
VOUT = -V
-
+
1M
V - input
+
1
2
3
4
8
7
6
5
TC7660
10 µF
10 µF
C1


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