BA9700A / BA9700AF / BA9700AFV
Regulator ICs
Q
1
2SB1009
R
9
GND
8
47k
10
3
2
SW
1
C
7
1000p
R
8
10k
RB100A
V
OUT
D
1
V
IN
C
6
470µ
330
R
7
L
1
220µH
C
4,
C
5
470µ
×2
11
2.57V
30k
Voltage
Regulator
V
ref
Triangle
Oscillator
GND
13
1.29V
30k
ERROR AMP
9
330
R
6
R
1
33k
14
R
3
6.8k
6
+
−
R
2
7.5k
0.047µ
C
2
C
1
12
680p
4
PWM COMPARATOR
5
7
C
3
1µ
1
L1: RCH-875 220K (Sumida Electronics)
R
4
22k
R
5
39k
Fig.3 Inverting converter
L
1
V
IN
R
11
GND
8
47k
10
3
2
Q
1
2.57V
30k
13
R
1
39k
14
R
2
4.7k
12
C
2
0.047µ
C
1
680p
4
30k
ERROR AMP
+
−
R
3
7.5k
PWM COMPARATOR
5
6
R
6
470
V
ref
1.29V
9
R
7
470
Voltage
Regulator
Triangle
Oscillator
2SB1009
R
8
68
SW
1
C
8
1000p
R
10
10k
C
7
100µ
R
9
470
22µH
RB100A
D
1
12V
V
OUT
C
5,
C
6
470µ
×2
11
Q
2
2SD1380
GND
7
C
4
1µ
1
L1: RCH-875 221K (Sumida Electronics)
R
4
20k
R
5
39k
Fig.4 Step-up converter
ROHM [ ROHM ]
