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9. REFERENCE: EXTERNAL CONNECTION EXAMPLES
9.8 High-Magnification Boosting Using a Diode
Loading an external diode in S1F76540 enables the "quintuple or more boosting + regulator" connection. 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
Quintuple Boosting + Regulator
Figure 9.9 shows a "quintuple boosting + regulator" connection example with one diode used. The cable from
VO to VRI must be as short as possible. Figure 9.10 shows the electric potential relation diagram.
V
REG
+
R1
V
DD
VI
Figure 9.9 Quintuple boosting connection example using one diode
Figure 9.9 Setting conditions
Internal clock
Booster
Regulator
V
DD
VI
VO
Figure 9.10 Quintuple-boosting potential relation using one diode
26
1
1
VO
CREG
2
VRI
R2
3
V
REG
4
RV
5
V
DD
+
6
FC
CI
7
TC1
8
TC2
:
ON (Low output mode)
:
ON
:
ON (Select CT0 = -0.05%/°C.)
4VI
5VI
EPSON
C2P
16
C2
C2N
15
C3N
14
C1
C1N
13
+
C1P
12
11
VI
POFF1X
10
POFF2X
9
5VI－VF
VO
VF
S1F76540M0C Series Technical Manual
VO'
D1
C4
+
C3
CO
+
+
(Rev.1.1)
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