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S1F76540 Series
2–26 EPSON S1F70000 Series
Technical Manual
Setup:
• Relationship between V
REG and reference voltage
VREG =
R1 + R2
× (Reference voltage) • • • • Equation (1)
R1
• Current consumption of division resistors
IREG =
| V
REG |
• • • • Equation (2)
R1 + R2
Setup example:
• To output V
REG = –18 V by four-time boosting if VI = –5 V and VO = –20 V
First, determine the total resistance of division resistors R1 and R2. If the current consumption is assumed to be 20
µA, the total resistance can be obtained from equation (2) as follows:
R1 + R2 = 12V ÷ 20 µA = 900 kΩ
If the reference voltage is -1.5 V, the division resistance ratio can be obtained from equation (1) as follows:
(R1 + R2) / R2 = (–18 V) ÷ (–1.5 V) = 12
Therefore, R1 and R2 are:
R1 = 75 kΩ
R2 = 825 kΩ
Figure 2.5 V
REG setup and mounting notes
R1
V
O
V
RI
V
REG
RV
V
DD
FC
TC1
TC2
C2P
C2N
C3N
C1N
C1P
V
I
P
OFF1
P
OFF2
R2
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9