Epson – Epson Power Supply S1F70000 User Manual
Page 92
S1F76640 Series
S1F70000 Series
EPSON
2–49
Technical Manual
S1F76640
Series
Measurement Circuit (Described on S1F76640M0A0)
Step-up circuit characteristic measurement circuit
Stabilization circuit characteristic measurement circuit
Note 1 :
All voltage values are based on GND being 0V.
Note 2 :
The value shown here is the step-up circuit conversion efficiency, and (V
O
-V
REG
)I
OUT
is lost when the
stabilization circuit operates. So, it is recommended to operate this so that (V
O
-V
REG
) becomes as small
as possible. When (V
O
-V
REG
)
×
I
O
is large, the IC temperature rises and the characteristics of the
stabilization circuit change.
Note 3 :
See Figures 6-5-14, 6-5-15 and 6-5-16.
Note 4 :
R
SAT
means inclination in Fig. 6-5-17, and V
O
-
∆
(V
O
-V
REG
) indicates the lower limit voltage of the
V
REG
output.
Note 5 :
The calculation formula of C
T
is as follows:
C
T
=
V
REG
(50˚C) – V
REG
(0˚C)
Ч
1
Ч
100 (%/˚C)
50˚C – 0˚C
V
REG
(25˚C)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
A
A
V
I
OPR1
R
OSC
C
2
C
1
C
3
R
L
I
O
V
O
C
4
+
+
+
+
–
–
–
–
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
A
V
A
R
L
V
O
R
1
R
2
V
I
(R
RV
=R
1
+R
2
)
I
O