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MB3887
24
■
APPLICATION EXAMPLE
A
B
Q1
Output voltage (Battery
voltage) is adjustable
D1
I1
Battery
R8
100 kΩ
C10
5600 pF
+
+ +
R9
10 kΩ
R14
1 kΩ
R10
30 kΩ
R11
30 kΩ
R7
22 kΩ
R18
200 kΩ
R19
100 kΩ
R17
100 kΩ
C6
1500 pF
C4
0.022 µF
R3
330 kΩ
R2
47 kΩ
C9
0.1 µF
C7
0.1 µF
C5
0.1 µF
C2
100 µF
C3
100 µF
C1
22 µF
0.033 Ω
R1
22 µH
L1
R4
82 kΩ
R5
330 kΩ
R6
68 kΩ
R15
120 Ω
R16
200 kΩ
Q2
SW
R12
30 kΩ
R13
20 kΩ
C8
10000 pF
A
B
AC Adaptor
IIN
V
O
+
−
−
+
8
10
13
12
9
+
−
−
+
4
2
24
1
3
× 20
× 20
+
+
+
−
5
20
21
19
−
+
+
+
−
11
16
22
17 6 23
14
18
<Current Amp1>
7
VREF
<Current Amp2>
VREF
VREF
VREF
VREF
5.0 V
4.2 V
10
µA
15
<SOFT>
2.5 V
1.5 V
<OUT>
<OSC>
Bias
Voltage
<VH>
<REF> <CTL>
<PWM Comp.>
Drive
VCC
(V
CC − 6 V)
(VCC UVLO)
VCC
VCC
CTL
215 kΩ
35 kΩ
0.91 V
(0.77 V)
VREF
UVLO
4.2 V
bias
−INC2
OUTD
FB2
OUTC2
VREF
−INE2
+INE2
+INE1
FB1
OUTC1
−INE1
−INC1
+INC2
GND
CS
VCC (O)
OUT
VH
RT
−INE3
FB3
+INC1
45 pF
<Error Amp1>
<Error Amp2>
<Error Amp3>
<UVLO>
VCC
VIN = 13.93 V to 25 V
(at 3 cell)
VIN = 17.65 V to 25 V
(at 4 cell)
Note:
Set output voltage so
that voltage applied to
OUTD terminal is 17 V or
less.