S1F76540MOC Epson Electronics America, Inc., S1F76540MOC Datasheet - Page 10

• Manufacturer Part Number: S1F76540MOC
• Description: Charge Pump Type Dc/dc Converter
• Manufacturer: Epson Electronics America, Inc.

5.4 Voltage Stabilizer
can be changed to any value based on the ratio between external split resistances R1 and R2 as shown in the
expression (see Section 5.1). In this case, the sum of these split resistances should be as small as possible to
limit influence of external noises; however, the current consumed for the split resistances will increase as shown
in the expression (see Section 5.2). Therefore, the sum of split resistance values should be approximately 100Ω
to 1MΩ.
described in Section 5.3.
[Setting method]
quadruple boosting.
split resistances is 20µA, the following will be obtained from expression (5.2).
(5.1).
S1F76540M0C Series Technical Manual (Rev.1.0)
The voltage stabilizer stabilizes the voltage input to the VRI pin and outputs any voltage. The output voltage
The temperature coefficient of the stabilizing potential will become equal to that of the reference voltage
[Setting example]
The following shows a setting example for outputting V
Determine the total resistor value of split resistances R1 and R2. If the allowable consumption current of the
If the reference voltage is -1.5V, the following ratio of the split resistances will be obtained from expression
Relational expression between V
Consumption current for split resistances
R1+R2 = 18V ÷ 20µA = 900kΩ
(R1+R2) ÷ R1 = (-18V) ÷ (-1.5V) = 12
V
I
REG
REG
=
=
Fig.5.3 V
R1+R2
|V
R1+R2
R1
REG
|
REG
REG
× (Reference voltage) ･････Expression (5.1)
and reference voltage
R2
R1
setting method and assembly consideration
1
1
2
3
4
5
6
7
8
VO
VRI
V
RV
V
FC
TC1
TC2
EPSON
REG
DD
REG
POFF1X
POFF2X
･････Expression (5.2)
= -18V when VI = -5V and VO = -20V at
C2N
C3N
C1N
C2P
C1P
VI
5. FUNCTIONAL DESCRIPTION
1
1
1
1
1
1
1
9
7