FUJITSU MB3887 - Manual (Page 24)

MB3887
24
■ APPLICATION EXAMPLE
A B
Q1
Output voltage (Battery voltage) is adjustable
D1
I1
Battery
R8 100 k
Ω
C10
5600 pF
+
+
+
R9
10 k
Ω
R14 1 k
Ω
R10 30 k
Ω
R11 30 k
Ω
R7
22 k
Ω
R18
200 k
Ω
R19
100 k
Ω
R17
100 k
Ω
C6
1500 pF
C4
0.022
µ F
R3
330 k
Ω
R2
47 k
Ω
C9 0.1
µ F
C7 0.1
µ
F
C5
0.1
µ F
C2
100
µ F
C3 100
µ F
C1 22
µ
F
0.033
Ω
R1
22
µ
H
L1
R4 82 k
Ω
R5 330 k
Ω
R6 68 k
Ω
R15
120
Ω
R16
200 k
Ω
Q2
SW
R12
30 k
Ω
R13
20 k
Ω
C8
10000 pF
A
B
AC Adaptor
IIN
V
O
+ −
− +
8
10 13 12
9
+ −
− +
4 2
24
1 3
Ч 20 Ч 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 µ
A
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 k
Ω
35 k
Ω
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.