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TC7660SVOA713 Datenblatt(PDF) 9 Page - Microchip Technology

Teilenummer TC7660SVOA713
Bauteilbeschribung  SUPER CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
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Hersteller  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC7660SVOA713 Datenblatt(HTML) 9 Page - Microchip Technology

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 2001-2015 Microchip Technology Inc.
DS20001467C-page 9
TC7660S
5.0
APPLICATIONS INFORMATION
5.1
Simple Negative Voltage
Converter
Figure 5-1 shows typical connections to provide a
negative supply where a positive supply is available. A
similar scheme may be employed for supply voltages
anywhere in the operating range of +1.5V to +12V,
keeping in mind that pin 6 (LV) is tied to the supply
negative (GND) only for supply voltages below 3.5V.
FIGURE 5-1:
Simple Negative Converter.
The output characteristics of the circuit in Figure 5-1
are those of a nearly ideal voltage source in series with
a 70
resistor. Thus, for a load current of -10 mA and
a supply voltage of +5V, the output voltage would be
-4.3V.
The dynamic output impedance of the TC7660S is due,
primarily, to capacitive reactance of the charge transfer
capacitor (C1). Since this capacitor is connected to the
output for only half of the cycle, the equation is:
EQUATION
5.2
Paralleling Devices
Any number of TC7660S voltage converters may be
paralleled to reduce output resistance (Figure 5-2). The
reservoir capacitor, C2, serves all devices, while each
device requires its own pump capacitor, C1. The resul-
tant output resistance would be approximately:
EQUATION
FIGURE 5-2:
Paralleling Devices Lowers Output Impedance.
FIGURE 5-3:
Increased Output Voltage By Cascading Devices.
+
V+
+
1
2
3
4
8
7
6
5
TC7660S
VOUT*
C1
10 µF
* VOUT = -V
+ for 1.5V  V+  12V
C2
10 µF
X
C
2
2fC
1
-----------
3.18
==
where:
f = 10 kHz and C1 = 10 µF.
R
OUT
R
OUT of TC7660S

n number of devices

---------------------------------------------------
=
“n”
“1”
RL
+
V+
+
1
2
3
4
8
7
6
5
TC7660S
C1
C2
+
1
2
3
4
8
7
6
5
TC7660S
C1
V
OUT *
“1”
+
V+
+
1
2
3
4
8
7
6
5
TC7660S
10 µF
*
VOUT = -n V+ for 1.5V  V+  12V
“n”
+
1
2
3
4
8
7
6
5
TC7660S
10 µF
10 µF
+
10 µF


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