|
MB3875_03 Datasheet, PDF (4/26 Pages) Fujitsu Component Limited. – DC/DC Converter IC for Charging | |||
|
◁ |
MB3875/3877
s BLOCK DIAGRAM
âINE1
11
OUTC1
10
+INC1
<Current Amp.1>
13
+
âINC1
12
à 25
â
+INE1
8
FB1
9
âINE2 6
OUTC2 4
+INC2
<Current Amp.2>
24
+
âINC2
1
à 25
â
+INE2
7
<Error
Amp.1>
VREF
â
+
<Error
Amp.2>
VREF
â
+
FB2
3
<PWM
Comp.>
+++â
<OUT>
Drive
VCC (O)
21
OUT
20
VCC
Bias voltage
block
VH
19
<VH>
(VCC â 5 V)
IN3
2
âINE3
16
R1
â
R2
50 kâ¦
FB3
15
<SOFT>
VREF
1 µA
CS
22
<Error
Amp.3>
VREF
â
+
+
VREF
(4.2 V)
<UVLO>
VCC
(VCC UVLO) 215 kâ¦
35 kâ¦
0.91 V
(0.77 V)
VREF
ULVO
2.5 V
1.5 V
<OSC>
(45 pF)
VCC
bias
<REF> <CTL>
17
5
23
RT VREF
GND
â :MB3875 100 kâ¦
MB3877 150 kâ¦
VCC
18
CTL
14
4
|
▷ |