Epson Power Supply IC S1F70000 Technical Manual page 37

S1F76620 Series
100
90
80
70
I =2mA
O
60
50
1 10
focs[kHz]
(13) Step-up power conversion efficiency vs.
Oscillation frequency 2
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
100 1000
(15) Step-up start voltage (1) vs. Load resistance
1–20
I =1mA
O
I =5mA
O
I =10mA
O
Ta=25 C
V =3V
DD
C =C =10 F
1 2
100 1000
Ta=25 C
C =C =10 F
1 2
R =1M
OSC
10000 100000
R [ ]
L
100
90
I =0.5mA
O
80 I
70
I
O
60
50
1 10
focs[kHz]
(14) Step-up power conversion efficiency vs.
Oscillation frequency 3
EPSON
=1mA
O
I =2mA
O
=5mA
Ta=25 C
V =2V
DD
C =C =10 F
1 2
100 1000
S1F70000 Series
Technical Manual