Epson – Epson Power Supply S1F70000 User Manual
Page 39
S1F76620 Series
1–22
EPSON
S1F70000 Series
Technical Manual
Series Connection
When S1F76620 is connected in series (V
DD
and V
O
in the previous stage are connected to GND and V
DD
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 V
DD
= 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
V
DD
'
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
-V
DD
) can be used as the input in the next stage (V
DD
-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)