S1F78100Y2A Epson Electronics America, Inc., S1F78100Y2A Datasheet - Page 40

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

Negative Voltage Conversion
S1F76620 can boost input voltage to twice on the positive potential side by using the circuit shown in Figure 6. But
the output voltage drops by the forward voltage V
shown in Figure 6 for example, V
Negative Voltage Conversion + Positive Voltage Conversion
When the 3 times step-up operation shown in Figure 1 and the positive voltage conversion in Figure 6 are combined,
the circuit shown in Figure 7 can be formed and 10V and –3.8V 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 conversion or the
positive voltage conversion).
S1F70000 Series
Technical Manual
Figure 7 Negative Voltage Conversion + Positive Voltage Conversion
1
2
3
4
P
GND
OSC1
OSC2
OFF
O
Figure 6 Negative Voltage Conversion
is calculated as follows: V
CAP1+
CAP1–
V
V
DD
O
1
2
3
4
P
GND
OSC1
OSC2
8
7
6
5
OFF
F
+
–
V
of the diode. When GND is 0V, V
EPSON
O1
+
–
CAP1+
CAP1–
V
V
DD
O
O
= –5V + 2
8
7
6
5
V
O2
+ –
+ –
0.6V = –3.8V.
V
V
DD
Potential Relations Diagram
SS
V
I
V
DD
O
'
2 V
is 5V and V
S1F76620 Series
I
–V
V
I
+2 V
O2
F
is 0.6V as
•
F
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