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TC7660SEPA713 Scheda tecnica(PDF) 11 Page - Microchip Technology

Il numero della parte TC7660SEPA713
Spiegazioni elettronici  SUPER CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
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Produttore elettronici  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC7660SEPA713 Scheda tecnica(HTML) 11 Page - Microchip Technology

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 2001-2015 Microchip Technology Inc.
DS20001467C-page 11
TC7660S
5.6
Combined Negative Voltage
Conversion and Positive Supply
Multiplication
Figure 5-7 combines the functions shown in Figure 5-3
and Figure 5-6 to provide negative voltage conversion
and positive voltage multiplication simultaneously. For
example, this approach would be suitable for generat-
ing +9V and -5V from an existing +5V supply. In this
instance, capacitors C1 and C3 perform the pump and
reservoir functions, respectively, for the generation of
the negative voltage, while capacitors C2 and C4 are
pump and reservoir, respectively, for the multiplied pos-
itive voltage. There is a penalty in this configuration
which combines both functions, however, in that the
source impedances of the generated supplies will be
somewhat higher due to the finite impedance of the
common charge pump driver at pin 2 of the device.
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 TC7660S transforming -5V to +5V
(or +5V to +10V, etc.). The only problem 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.
5.8
Voltage Splitting
The same bidirectional characteristics used in
Figure 5-8 can also be used to split a higher supply in
half, as shown in Figure 5-9. The combined load will be
evenly shared between the two sides. Once again, a
high value resistor to the LV pin ensures start-up.
Because the switches share the load in parallel, the
output impedance is much lower than in the standard
circuits, and higher currents can be drawn from the
device. By using this circuit, and then the circuit of
Figure 5-3, +15V can be converted (via +7.5V and -7.5V)
to a nominal -15V, though with rather high series
resistance (~250Ω).
FIGURE 5-9:
Splitting a Supply in Half.
5.9
Negative Voltage Generation for
Display ADCs
The TC7106 is designed to work from a 9V battery.
With a fixed power supply system, the TC7106 will
perform conversions with input signal referenced to
power supply ground.
5.10
Negative Supply Generation for
4½ Digit Data Acquisition System
The TC7135 is a 4½ digit ADC operating from ±5V
supplies. The TC7660S provides an inexpensive -5V
source. (See AN16 and AN17 for TC7135 interface
details and software routines.)
+
C1
D1
+
+
C3
C4
C2
D2
+
VOUT =
1
2
3
4
8
7
6
5
TC7660S
V+
(2 V+) - (2 VF)
VOUT
= -V+
VOUT = -V
-
+
1M
V- input
+
1
2
3
4
8
7
6
5
TC7660S
10 µF
10 µF
C1
+
R
L1
R
L2
V
OUT
=
V
+
–V
2
50
μF
100 k
Ω
50
μF
V
+
V
50
μF
+
1 M
Ω
1
2
8
7
TC7660S
3
4
6
5
+


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