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S1F76620 Series
1–22 EPSON S1F70000 Series
Technical Manual
Series Connection
When S1F76620 is connected in series (V
DD 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 3 shows an example of the series connection to get V
O = 15V from VDD = 5V.
P
OFF
V
I
+
–
+
–
GND
OSC1
OSC2
V
O
CAP1+
CAP1–
V
DD
1
2
3
4
8
7
+
–
+
–
6
5
P
OFF
GND
OSC1
OSC2
V
O
Vo'=3 V
I
Vo=2 V
I
CAP1+
CAP1–
V
DD
1
2
3
4
6
5
8
7
• •
Figure 3 Series Connection
VDD'
V
O=10V
V
O'=15V
V
DD(5V)
GND(0V)
GND'
First stage Next stage
Figure 4 Power Supply Relations in Series Connection (1)
Note
When the input voltage in the next stage is as per the specification (V
DD-GND ≤ 8V) in a series connection, the
output in the first stage (V
O-VDD) can be used as the input in the next stage (VDD-GND). (See Figure 5.)
V
DD
'
V
O
=4V
V
O
'=8V
V
DD
(2V)
GND(0V)
GND'
First stage
Next stage
Figure 5 Power Supply Relations in Series Connection (2)