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TC7660SVPA713 Fiches technique(PDF) 10 Page - Microchip Technology

No de pièce TC7660SVPA713
Description  SUPER CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
Download  24 Pages
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC7660SVPA713 Fiches technique(HTML) 10 Page - Microchip Technology

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TC7660S
DS20001467C-page 10
 2001-2015 Microchip Technology Inc.
5.3
Cascading Devices
The TC7660S may be cascaded as shown (Figure 5-3)
to produce larger negative multiplication of the initial
supply voltage. However, due to the finite efficiency of
each device, the practical limit is 10 devices for light
loads. The output voltage is defined by:
EQUATION
where n is an integer representing the number of
devices cascaded. The resulting output resistance
would be approximately the weighted sum of the
individual TC7660S ROUT values.
5.4
Changing the TC7660S Oscillator
Frequency
It may be desirable in some applications (due to noise
or other considerations) to increase the oscillator fre-
quency. Pin 1, frequency boost pin, may be connected
to V+ to increase oscillator frequency to 45 kHz from a
nominal of 10 kHz for an input supply voltage of 5.0V.
The oscillator may also be synchronized to an external
clock as shown in Figure 5-4. In order to prevent possi-
ble device latch-up, a 1 kΩ resistor must be used in
series with the clock output. In a situation where the
designer has generated the external clock frequency
using TTL logic, the addition of a 10 kΩ pull-up resistor
to V+ supply is required. Note that the pump frequency
with external clocking, as with internal clocking, will be
half of the clock frequency. Output transitions occur on
the positive-going edge of the clock.
FIGURE 5-4:
External Clocking.
It is also possible to increase the conversion efficiency
of the TC7660S at low load levels by lowering the
oscillator frequency. This reduces the switching losses,
and is achieved by connecting an additional capacitor,
COSC, as shown in Figure 5-5. Lowering the oscillator
frequency will cause an undesirable increase in the
impedance of the pump (C1) and the reservoir (C2)
capacitors. To overcome this, increase the values of C1
and C2 by the same factor that the frequency has been
reduced. For example, the addition of a 100 pF
capacitor between pin 7 (OSC) and pin 8 (V+) will lower
the oscillator frequency to 1 kHz from its nominal
frequency of 10 kHz (a multiple of 10), and necessitate
a corresponding increase in the values of C1 and C2
(from 10 µF to 100 µF).
FIGURE 5-5:
Lowering Oscillator
Frequency.
5.5
Positive Voltage Multiplication
The TC7660S may be employed to achieve positive
voltage multiplication using the circuit shown in
Figure 5-6. In this application, the pump inverter
switches of the TC7660S are used to charge C1 to a
voltage level of V+–VF (where V+ is the supply voltage
and VF is the forward voltage drop of diode D1). On the
transfer cycle, the voltage on C1 plus the supply voltage
(V+) is applied through diode D2 to capacitor C2. The
voltage thus created on C2 becomes (2V+) – (2VF), or
twice the supply voltage minus the combined forward
voltage drops of diodes D1 and D2.
The source impedance of the output (VOUT) will depend
on the output current, but for V+ = 5V and an output
current of 10 mA, it will be approximately 60Ω.
FIGURE 5-6:
Positive Voltage Multiplier.
V
OUT
n
V
+

=
CMOS
GATE
1k
VOUT
“1”
+
V+
+
1
2
3
4
8
7
6
5
TC7660S
10 µF
10 µF
V+
VOUT
+
+
1
2
3
4
8
7
6
5
TC7660S
C1
C2
V+
COSC
+
C2
D1
D2
+
C1
VOUT =
1
2
3
4
8
7
6
5
TC7660S
V+
(2 V+) - (2 VF)


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