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08. APPLIED CIRCUIT EXAMPLES
(6) Negative-Voltage Conversion + Positive-Voltage Conversion
Combining the triple boosting (Fig.8.1) with the negative voltage conversion (Fig.8.11) generates the
circuit shown in Fig.8.14, and outputs 15V and -8.2V from 5V input.
In this case, the output impedance is higher than that for negative voltage conversion only or positive
voltage conversion only.
V
SS
Fig.8.14 Negative-Voltage Conversion + Positive-Voltage Conversion
Fig.8.15 Diagram of Voltage Relations for Negative-Voltage Conversion + Positive-Voltage
15
10
5
Ta=25°C
I
'=5mA
O
0
0
10
Fig.8.16 Output Voltage - Output Current
22
1
RV
VRI
2
V
V
REG
OUT
3
TC1
CAP3+
4
TC2
CAP2+
5
XP
CAP2−
OFF
6
V
CAP1+
SS
R
OSC
7
OSC1
CAP1−
1MΩ
8
OSC2
V
DD
V
(+5V)
DD
V
(0V)
SS
3 $ V
20
30
40
I
[mA]
O
V
OUT
16
15
C5
+
14
10μF
−
13
C3
C2
+
10μF
＋ －
−
12
10μF
C4
11
+
C1
10μF
−
＋ －
10
10μF
9
V
OUT
3 $ V
DD
DD
' ( − 8.2V)
V
OUT
3 $ V
F
Conversion
0
-5
-10
0
Fig.8.17 Output Voltage - Output Current
S1F76640 Technical Manual (Rev.1.5)
EPSON
V
OUT
C6
+
10μF
−
R
'
R
L
L
Io
Io'
A
A
V
DD
( + 15V)
Ta=25°C
Io=5mA
10
20
30
I
' [mA]
O
40
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