TC7660EOATR 데이터 시트보기 (PDF) - Microchip Technology
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TC7660EOATR Datasheet PDF : 20 Pages
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V+
1
8
2
7
TC7660
3
6
+
4
C1
5
+
C2
VOUT
= -V+
D1 + C3
VOUT =
D2 (2 V+) - (2 VF)
+
C4
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.
VOUT = -V-
C1 +
10 µF
1
8
2
7
TC7660
3
6
4
5
1 M
+
10 µF
V- input
FIGURE 5-8:
Conversion.
Positive Voltage
TC7660
2002-2011 Microchip Technology Inc.
DS21465C-page 9
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