Epson S1F70000 User Manual

S1F70000 Series

2–57

Technical Manual

   Figure 8.1 shows the connection for getting 4 times step-up output of an input voltage by operating the step-up
circuit only.   In case of 3 times step-up, the capacitor C

3

 is removed and CAP3+ (Pin No. 14) is short-circuited to

V

O

 (Pin No. 15), and 3 times step-up voltage is obtained from V

O

(CAP3+).   In case of 2 times step-up, the capacitor

C

2

 is also removed and CAP2+ (Pin No. 13) is short-circuited to V

O

 (Pin No. 15), and 2 times step-up voltage (10V)

is obtained from V

O

 (CAP2+).

   Figure 8-2 shows an application example for stabilizing step-up outputs obtained in 8-(1) through the stabilization
circuit and for providing temperature gradient to V

REG

 output by means of the temperature gradient selection cir-

cuit.   In this application example, both outputs from V

O

 and V

REG

 can be indicated at the same time.   Also,

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 :

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

RV

 value small for reducing

noise influence. (In this case, however, more current comes to be consumed at R

RV

.)

C

1

V

I

C

2

C

3

C

4

4V

I

+
–

+
–

+
–

+
–

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

2

C

5

+
–

C

1

+
–

C

3

+
–

C

4

V

I

R

1

R

1

R

1

+R

2

R

2

+
–

+
–

Note 1

V

REG

=             ·V

RV

V

REG

(R

RV

=R

1

+R

2

)

Note 2