Epson Power Supply IC S1F70000 Technical Manual page 106

Configuration Example of High Magnification Step-up Circuit with Diode
S1F76640, if an external diode is attached, can realize 5 times or more step-up operation and voltage stabilized
output. Since the forward voltage drop V
is recommended to use a diode of small V
which realizes 6 times step-up operation and voltage stabilized output. Make the wire between V
as possible. Figure 8.11 shows the potential relations diagram
By the way, use the voltage applied to the V
V or V
SS O
V or V
SS O
Figure 8.10 Configuration Example of 6 times step-up Circuit with Diode
V
DD
V
SS
Figure 8.11 Potential Relations Diagram of 6 times Step-up Circuit with Diode
S1F70000 Series
Technical Manual
of the diode makes the output impedance of the step-up output higher, it
F
. Figure 8.10 shows a configuration example of a circuit with 2 diodes,
F
pin below the absolute maximum rated voltage.
RI
1
RV V
2
V V
REG
3
TC1 CAP3+
4
TC2 CAP2+
5
P CAP2–
OFF
6
V CAP1+
SS
7
OSC1 CAP1–
8
OSC2 V
DD
V
O
4 · V
I
V
I
EPSON
16
RI
15
O
+
14
C
4
–
13 +
–
C
2
12
+
C
3
11 + –
–
C
1
10
9
2 · V
F
V '
O
6 · V 6 · V –2 · V
1 I F
S1F76640 Series
and V as short
O RI
+
C
5
–
+
C
6
–
2–63