S1F78100Y2A Epson Electronics America, Inc., S1F78100Y2A Datasheet - Page 103

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

S1F76640 Series
Negative Voltage Conversion
Figure 8.6. (In case of 3 times step-up, remove the capacitor C
D
the output voltage drops by the forward voltage V
shown in Figure 8.6 for example, V
step-up, V
= –3.8V.)
Negative Voltage Conversion + Positive Voltage Conversion
combined, the circuit shown in Figure 8.7 can be formed and 20V and –12.6V can be obtained from the input 5V.
However, the output impedance is higher than in case of connection of either one only (the negative voltage conver-
sion or the positive voltage conversion).
2–60
4
S1F76640 can boost input voltage to negative power on the negative potential side by using the circuit shown in
When the 3 times step-up operation shown in Figure 8.1 and the positive voltage conversion in Figure 8.6 are
. In case of 2 times step-up, remove the capacitor C
O
Figure 8.6 Negative Voltage Conversion (Example of 3 times step-up circuit)
is calculated to –10V–3 0.6V = –8.2V, and in case of 2 times step-up, V
Figure 8.7 Negative Voltage Conversion + Positive Voltage Conversion
O
1
2
3
4
5
6
7
8
is calculated as follows: V
1
2
3
4
5
6
7
8
RV
V
TC1
TC2
P
V
OSC1
OSC2
RV
V
TC1
TC2
P
V
OSC1
OSC2
REG
OFF
SS
REG
OFF
SS
F
of the diode. When GND is 0V, V
CAP3+
CAP2+
CAP1+
CAP2–
CAP1–
EPSON
CAP3+
CAP2+
CAP1+
CAP2–
CAP1–
2
and the diode D
V
V
V
V
DD
V
RI
V
O
DD
RI
O
16
15
14
13
12
11
10
9
16
15
14
13
12
11
10
3
9
and the diode D
+
+
O
= –15V–4
–
–
C
C
2
1
3
+
–
+
–
and short-circuit the both ends of D
+
–
D
D
+
+ –
D
3
2
1
–
4
0.6V = –12.6V(In case of 3 times
–
+
and short-circuit the both ends of
C
O
0
is calculated to –5V–2 0.6V
DD
+
–
V
V
V
is 5V and VF is 0.6V as
O
O
O
'
'
'
Technical Manual
S1F70000 Series
3
.) But