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TC7660 Fiches technique(PDF) 9 Page - Microchip Technology

No de pièce TC7660
Description  CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
PDF  12 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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9
TC7660
CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
© 2001 Microchip Technology Inc.
DS21465A
TC7660-7 9/30/96
1
2
3
4
8
7
6
5
+
VOUT = –V
–
10
µF
+
1 M
Ω
V– INPUT
C1
10
µF
TC7660
+
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
TC7660
3
4
6
5
+
–
–
Voltage Splitting
The same bidirectional characteristics used in Figure 10
can also be used to split a higher supply in half, as shown in
Figure 11. The combined load will be evenly shared be-
tween 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, +15V can be converted (via +7.5V and –7.5V) to a
nominal – 15V, though with rather high series resistance
(~250
Ω).
Figure 10. Positive Voltage Conversion
Figure 11. Splitting a Supply in Half



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