S1F78100Y2A Epson Electronics America, Inc., S1F78100Y2A Datasheet - Page 100

• Manufacturer Part Number: S1F78100Y2A
• Description: High Precision Voltage Regulators
• Manufacturer: Epson Electronics America, Inc.

APPLICATION EXAMPLE
2 Times Step-up, 3 Times Step-up and 4 Times Step-up
circuit only. In case of 3 times step-up, the capacitor C
V
C
is obtained from V
4 Times Step-up + Stabilization Circuit
circuit and for providing temperature gradient to V
cuit. In this application example, both outputs from V
operation of 3 times step-up + stabilization circuit is possible by using the 3 times step-up operation mentioned in 8-
(1), and operation of 2 times step-up + stabilization circuit is possible by using the 2 times step-up operation.
Note 1 :
S1F70000 Series
Technical Manual
2
Figure 8-2 shows an application example for stabilizing step-up outputs obtained in 8-(1) through the stabilization
O
Figure 8.1 shows the connection for getting 4 times step-up output of an input voltage by operating the step-up
Figure 8-2 Operation of 4 Times Step-up + Stabilization Circuit (Temperature Gradient CT1 is
is also removed and CAP2+ (Pin No. 13) is short-circuited to V
(Pin No. 15), and 3 times step-up voltage is obtained from V
V
REG
Since input impedance at the RV pin (No. 1) is high, it is necessary to use a shielded wire as a measure
against noise in case of a long connection. It is also effective to make the R
noise influence. (In this case, however, more current comes to be consumed at R
V
(R
REG
=
RV
R
=R
1
R
O
+R
1
1
(CAP2+).
+R
2
·V
2
V
C
)
RV
I
5
Note 2
+
–
Note 1
R
R
V
2
1
I
Figure 8-1 4 times step-up circuit
1
2
3
4
5
6
7
8
RV
V
TC1
TC2
P
V
OSC1
OSC2
REG
OFF
SS
REG
selected.)
EPSON
1
2
3
4
5
6
7
8
output by means of the temperature gradient selection cir-
3
RV
V
TC1
TC2
P
V
OSC1
OSC2
is removed and CAP3+ (Pin No. 14) is short-circuited to
REG
OFF
SS
O
CAP3+
CAP2+
CAP1+
CAP2–
CAP1–
and V
V
O
V
V
DD
(CAP3+). In case of 2 times step-up, the capacitor
RI
O
O
REG
16
15
14
13
12
11
10
CAP3+
CAP2+
CAP2–
CAP1+
CAP1–
(Pin No. 15), and 2 times step-up voltage (10V)
9
V
can be indicated at the same time. Also,
V
V
DD
RI
O
16
15
14
13
12
11
10
9
+
–
+
–
C
C
2
1
+
–
+
–
+
–
RV
C
C
C
2
1
3
value small for reducing
RV
S1F76640 Series
+
–
+
–
.)
C
C
3
4
+
–
4V
C
I
4
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