SCI7661C
OA
/M
OA
q
Positive Voltage Conversion
The input voltage can be doubled or tripled toward the positive
side. (In the doubler configuration, capacitor C
2
and diode D
3
are disconnected and the diode D
3
shorted at the both ends.)
In this case, however, the output voltage decrease by V
F
(forward
voltage)
For example V
DD
=0V, V
IN
=–5V and V
F
=0.6V, then V
OUT
=10V–
3×0.6V=8.2 V (if doubled, 5V–2×0.6V=3.8V)
V
IN
=
-5V
5V
D
3
C
3
10µF
+ −
V
DD
=0V
D
1
D
2
C
1
10µF
+ −
C
2
10µF
+ −
1
2
3
4
5
6
7
14
13
12
11
10
9
8
ROSC
1MΩ
V
OUT
=8.2V
Positive Voltage Conversion D1, D2, D3,: Shottky
diodes with small V
F
are recommended.
q
Negative Voltage Conversion + Positive
Voltage Conversion
This circuit produces outputs of –15V and +8.2V from
the –5V input. Note that this configuration causes
higher output impedance than in a single function
(negative or positive voltage converter).
V
DD
=0V
10µF
+
V
OUT2
=13.2V
+
−
+
−
−
10µF
+
−
5V
V
OUT2
=
8.2V
V
IN
=
-5V
10µF
10µF
+
−
1
2
3
4
5
6
7
+
−
14
V
DD
=5V
13
1MΩ
12
V
DD
=0V
11
10
9 V
OUT1
=-15V
8
V
OUT1
=-10V
10µF
Negative Voltage Convertion +Positive Voltage Conversion
q
Changing the Temperature Gradient through Use of External
1
14
13
12
+
−
11
10
9
8
V
reg
10µF
R
1
R
RV
Temperature Sensor (Thermistor)
The SCI7661C/M has a temperature gradient selector circuit in its
regulator. It selects any one of the three gradients: –0.1% /
°C,
–0.4% /
°C
and –0.6% /
°C.
It is necessary that the temperature gradient can be
changed to any other value by connecting a thermistor in series to the
output voltage control resistor R
RV
.
V
DD
2
3
4
5
6
7
R
T
R
P
Example of Change of Temperature Gradient
s
PACKAGE DIMENSIONS
Plastic DIP-14pin
(
0.775
max
)
(
0.748
±0.003
)
14
8
19
±0.1
19.7
max
1
1.5
(
0.059
)
7
(
0.119
min
) (
0.173
–0.003
)
(
0.031
–0.003
)
4.4
±0.1
+0.004
0.8
±0.1
+0.004
(
0.248
±0.003
)
6.3
±0.1
3
min
2.54
(
0.1
)
±0.1
0.46
+0.004
(
0.018
–0.003
)
0°
15°
7.62
(
0.3
)
0.25
–0 .001
+0
)
(
0.01
–0
+0.03
.01
Unit: mm
(inch)
7
EPSON [ EPSON COMPANY ]
