Epson Power Supply IC S1F70000 Technical Manual page 78

Positive Voltage Conversion
The S1F76540 can also boost up a voltage to the posi-
tive potential using external diodes. In such case, how-
ever, the regulator function is unavailable. Figure 2.14
V
DD
V
I
Figure 2.14 Wiring example of positive voltage conversion (3-time boosting)
Setup conditions of Figure 2.14
• Internal clock : ON (Low Output mode)
• Booster circuit : ON
• Regulator : OFF
Figure 2.15 Potential relationship during positive voltage conversion (3-time boosting)
Power-off procedure
• Set the P pin to low (V
OFF2
Two-time boosting
• To boost up a voltage two times, remove capacitor C1 and diode D1 of Figure 2.14, and connect the anode of
diode D2 to the V pin.
DD
S1F70000 Series
Technical Manual
1 V
O
2 V
RI
3 V
REG
4 RV
5 V
DD
6 FC
+
7 TC1
8 TC2
C
I
3V
I
V
DD
V
I
V
I
) to turn off all circuits.
I
EPSON
gives a wiring example for three-time positive boosting,
and Figure 2.15 provides its electrical potential rela-
tionship.
D1 D2
C1 +
C2P 16
+
C2
C2N 15
C3N 14
C1N 13
C1P 12
V 11
I
P 10
OFF1
P 9
OFF2
3 V
F
V
O'
3V – (3 V )
I F
S1F76540 Series
D3
V '
O
+
C
O
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