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S1F76640 Series
2–58 EPSON S1F70000 Series
Technical Manual
Parallel Connection
It is possible to make the output impedance RO small when several pieces of the circuit shown in Figure 8.1 are
connected. Parallel connection of n circuits reduces R
O to 1/n approximately. One piece of the smoothing capaci-
tor C
4 can be commonly used in the same way. To get stabilized outputs after parallel connection, include 1 pieces
of the circuit shown in Figure 8.2 in the parallel connection of n circuits as shown in Figure 8.3.
Figure 8.3 Parallel Connection
Series Connection
When S1F76640 is connected in series (VDD and VO in the previous stage are connected to GND and VDD in the
next stage respectively), the output voltage can be increased more. But the series connection makes the output
impedance high. Figure 8.4 shows an example of the series connection to get V
O=25V from VDD=5V and to
stabilize it.
Figure 8.4 Series Connection
RV
V
REG
TC1
TC2
P
OFF
V
SS
OSC1
OSC2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
RI
V
O
CAP3+
CAP2+
CAP2–
CAP1+
CAP1–
V
DD
RV
V
REG
TC1
TC2
P
OFF
V
SS
OSC1
OSC2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
RI
V
O
CAP3+
CAP2+
CAP2–
CAP1+
CAP1–
V
DD
C
3
C
2
C
2
C
1
C
1
C
4
C
3
+
–
+
–
+
–
+
–
+
–
+
–
+
–
V
REG
R
RV
(100kΩ=1MΩ)
+
–
+
–
+
–
+ –
+
–
+
–
RV
V
REG
TC1
TC2
P
OFF
V
SS
OSC1
OSC2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
RI
V
O
CAP3+
CAP2+
CAP2–
CAP1+
CAP1–
V
DD
RV
V
REG
TC1
TC2
P
OFF
V
SS
OSC1
OSC2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
RI
V
O
CAP3+
CAP2+
CAP2–
CAP1+
CAP1–
V
DD
C
1
D
1
Load