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MB3878
20
■
■■
■
APPLICATION EXAMPLE 2
+
−
−
+
8
10
13
12
A
B
C
D
9
+
−
+
−
+
−
−
+
4
2
24
1
3
× 25
× 25
+
+
+
−
5
20
21
19
−
+
+
+
−
11
16
22
17 6 23
14
18
<Current Amp.1>
<Error
Amp.1>
7
VREF
<Current Amp.2>
<Error
Amp.2>
VREF
<Error
Amp.3>
VREF
VREF
VREF
5.0 V
4.2 V
1 µA
15
<SOFT>
2.5 V
1.5 V
<OUT>
<UVLO>
<OSC>
Bias
Voltage
<VH>
<REF> <CTL>
<PWM Comp.>
Drive
V
CC
(V
CC
− 5 V)
(VCC UVLO)
VCC
VCC
VCC
CTL
215 kΩ
35 kΩ
0.91 V
(0.77 V)
VREF
UVLO
bias
−INC2
OUTD
FB2
VREF
−INE2
+INE2
+INE1
FB1
OUTC1
−INE1
−INC1
+INC2
GND
CS
VCC (O)
OUT
Q1
Output voltage (Battery voltage) is adjustable
D1
Battery
VH
RT
−INE3
FB3
+INC1
(45 pF)
R8
100 kΩ
C10
5600 pF
+
−
+
−
+
−
R9
10 kΩ
R14
1.3 kΩ
R10
24 kΩ
R11
36 kΩ
R7
22 kΩ
R18
200 kΩ
R17
100 kΩ
C
S
2200 pF
R3
330 kΩ
R
T
47 kΩ
C9
0.1 µF
C7
0.1 µF
C5
0.1 µF
C2
100 µF
C3
100 µF
C1
22 µF
R
S
1
0.033 Ω
R
S
2
0.033 Ω
L1
12 µH
R22
100 kΩ
R21
100 kΩ
R19
100 kΩ
R20
100 kΩ
R15
110 Ω
R16
200 kΩ
Q2
A(1/2)
A(2/2)
SW
VIN VIN
Note : SW ON : Differential Charging MODE
R12
30 kΩ
R13
30 kΩ
C8
10000 pF
A B
C D
System
AC Adaptor
VIN
BATT
OUTC2
R23
100 kΩ
C6
1500 pF
SW OFF : Dead Battery MODE
Range of input voltage
VIN = 13V to 21V(at Load = 3A)