Epson Power Supply IC S1F70000 Technical Manual page 74

4-time Booster
Only the booster circuit operates, and it boosts the input
voltage (V ) four times in negative direction and outputs
I
it at the V pin. As the regulator is not used, the voltage
O
V
O
V
DD
V
I
Setup conditions of Figure 2.9
• Internal clock : ON (Low Output mode)
• Booster circuit : ON
• Regulator : OFF
Power-off procedure
• Set the P pin to low (V
OFF2
Ripple voltage
• As the output at V pin is unstable, it can contain ripple components as shown in Figure 2.10. The ripple voltage
O
(V ) increases according to the load current, and it can roughly be calculated by equation (4).
RP
S1F70000 Series
Technical Manual
C
O
+
+
C
I
Figure 2.9 Wiring example of 4-time booster
) to turn off all circuits.
I
EPSON
appearing at the V pin may contain ripple components.
O
Figure 2.9 gives a wiring example.
1 V C2P 16
O
2 V C2N 15
RI
3 V C3N 14
REG
C1
4 RV C1N 13
5 V C1P 12
DD
6 FC V 11
I
7 TC1 P 10
OFF1
8 TC2 P 9
OFF2
S1F76540 Series
+
C2
C3
+
+
2–31