Typical Applications; Parallel Connection - Epson SCI 7654 Series Technical Manual

SCI7661 Series

TYPICAL APPLICATIONS

Voltage Tripler with Regulator
The following figure shows the circuit required to triple
the input voltage, regulate the result and add a tempera-
ture gradient of –0.4%/ C. Note that the high input im-
pedance of RV requires appropriate noise countermea-
sures.
V = 0 V
DD
1
C1 +
10 F
2
3
5 V
C2 +
10 F
4
5
6
7
V = –5 V
I
+

Parallel Connection

Connecting two or more chips in parallel reduces the
output impedance by 1/n, where n is the number of de-
vices used.
Only the single output smoothing capacitor, C3, is re-
V = 0 V
DD
C1 +
10 F
+
C2
10 F
5 V
V = –5 V
I
2–12
14
R
13 R1 RV
100 k
R
OSC
1 M to
R2
12
1 M
11
10
9
V
REG
8 V = –15 V
O
C3
10 F
1 14
2 13
3 12
4 11
5 10
6 9
7 8
Converting a Voltage Tripler to a Voltage
Doubler
To convert this curcuit to a voltage doubler, remove ca-
pacitor C2 and short circuit CAP2– to V
V = 0 V
DD
C1
10 F
5 V
C2
10 F
+ C4
10 F
V = –5 V
I
= –8 V
R
RV
= V
RV
R
1
quired when any number of devices are connected in
parallel. Also, the voltage regulator in one chip is suffi-
cient to regulate the combined output.
1
C1 +
10 F
2
R
OSC
1 M
3
+
C2
10 F
4
5
6
7
+ C3
10 F
EPSON
1 14
+
2 13
3 12
+
4 11
5 10
6 9
7 8
+
C3
10 F
14
13
R
OSC
1 M
12
11
10
9
8
V = –15 V
O
.
O
R
OSC
1 M
V = –15 V
O
R
RV
100 k
to
1 M
+ C4
10 F
V = –10 V
REG
SCI7000 Series
Technical Manual