S1F76540MOC Epson Electronics America, Inc., S1F76540MOC Datasheet - Page 29

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

9. REFERENCE: EXTERNAL CONNECTION EXAMPLES
9.8 High-Magnification Boosting Using a Diode
Using the forward voltage lowering VF in a diode raises the boosting output impedance; therefore, you should
load a diode with the lower VF value.
9.8.1
VO to VRI must be as short as possible. Fig.9.10 shows the electric potential relation diagram.
26
Loading an external diode in S1F76540 enables the “quintuple or more boosting + regulator” connection.
Fig.9.9 shows a “quintuple boosting + regulator” connection example with one diode used. The cable from
V
V
REG
Quintuple Boosting + Regulator
DD
Fig.9.9 Setting conditions
VI
Internal clock :
Booster
Regulator
R1
V
VI
VO
Fig.9.9 Quintuple boosting connection example using one diode
+
Fig.9.10 Quintuple-boosting potential relation using one diode
DD
CREG
CI
+
:
:
R2
ON (Low output mode)
ON
ON (Select CT0 = -0.05%/°C.)
4VI
1
2
3
4
5
6
7
8
5VI
1
VO
VRI
V
RV
V
FC
TC1
TC2
REG
DD
EPSON
VF
POFF1X
POFF2X
C2N
C3N
C1N
C2P
C1P
VI
5VI－VF
S1F76540M0C Series Technical Manual (Rev.1.0)
16
15
14
13
12
11
10
9
VO
C2
C1
+
+
C4
C3
+
D1
CO
+
VO’