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TC7660COATR Datasheet(PDF) 6 Page - Microchip Technology

No. de pieza TC7660COATR
Descripción Electrónicos  5V To 짹10V Voltage Converter
Download  18 Pages
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Fabricante Electrónico  MICROCHIP [Microchip Technology]
Página de inicio  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC7660COATR Datasheet(HTML) 6 Page - Microchip Technology

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TCM680
DS21486C-page 6
© 2005 Microchip Technology Inc.
4.0
DETAILED DESCRIPTION
4.1
VOUT
- Charge Storage - Phase 1
The positive side of capacitors C1 and C2 are con-
nected to +5V at the start of this phase. C1
+ is then
switched to ground and the charge in C1
is transferred
to C2
. Since C
2
+ is connected to +5V, the voltage
potential across capacitor C2 is now 10V.
FIGURE 4-1:
Charge Pump - Phase 1.
4.2
VOUT
- Transfer - Phase 2
Phase two of the clock connects the negative terminal
of C2 to the VOUT
- storage capacitor C
3 and the positive
terminal of C2 to ground, transferring the generated
-10V to C3. Simultaneously, the positive side of capac-
itor C1 is switched to +5V and the negative side is
connected to ground.
FIGURE 4-2:
Charge Pump - Phase 2.
4.3
VOUT
+ Charge Storage - Phase 3
The third phase of the clock is identical to the first
phase – the charge stored in C1 produces -5V in the
negative terminal of C1, which is applied to the negative
side of capacitor C2. Since C2
+ is at +5V, the voltage
potential across C2 is 10V.
FIGURE 4-3:
Charge Pump - Phase 3.
4.4
VOUT
+ Transfer - Phase 4
The fourth phase of the clock connects the negative
terminal of C2 to ground and transfers the generated
10V across C2 to C4, the VOUT
+ storage capacitor.
Simultaneously, the positive side of capacitor C1 is
switched to +5V and the negative side is connected to
ground, and the cycle begins again.
FIGURE 4-4:
Charge Pump - Phase 4.
VOUT
-
VOUT
+
-5V
SW4
SW1
SW2
SW3
C4
+
+
+
+
VIN = +5V
C2
C3
C1
VOUT
-
VOUT
+
-5V
SW4
SW1
SW2
SW3
C4
+
+
+
+
+5V
C2
C3
C1
-10V
VOUT
-
VOUT
+
-5V
SW4
SW1
SW2
SW3
C4
+
+
+
+
VIN = +5V
C2
C3
C1
-10V
VOUT
-
VOUT
+
-5V
SW4
SW1
SW2
SW3
C4
+
+
+
+
+5V
C2
C3
C1


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