MB3827 Datasheet, PDF (6/41 Pages) Fujitsu Component Limited. – 6-ch DC/DC Converter IC With Synchronous Rectification for voltage step-up and step-down

MB3827
s BLOCK DIAGRAM
• General view
FB1 45
−IN1 44
DTC1-1 43
DTC1-3 42
Error
− ^Amp.1
+
+
1.26 V
SCP
− ^Comp.1
+
+
1.0 V
DTC1-4 41
FB2 38
−IN2 39
DTC2 40
RB1
+
−
SEL
Comp.
1.26 V
Error
− ^Amp.2
+
+
1.26 V
SCP
− ^Comp.2
+
+
1.0 V
VB1-1 PWM
(0.50 V) Comp.1-1
+
+
VB1-2 ^−
(0.55 V) PWM
Comp.1-2
+
−
PWM
Comp.1-3
−
−
+
VB1-4 PWM
(0.02 V) Comp.1-4
+
+
−
PWM
Comp.2-1
+
+
VB2 ^−
(0.04 V) PWM
Comp.2-2
+
−
CH1
Drive
1-1
Drive
1-2
Drive
1-3
Drive
1-4
CH2
Drive
2-1
Drive
2-2
FB3 37
−IN3 36
DTC3 35
FB4 20
−IN4 21
DTC4 22
Error
− ^Amp.3
+
+
1.26 V
SCP
− ^Comp.3
+
+
1.0 V
Error
− ^Amp.4
+
+
1.26 V
SCP
− ^Comp.4
+
+
1.0 V
FB5 19
−IN5 18
-IN(C)5 17
DTC5 16
−IN(A)6 10
OUT(A)6 11
FB6 13
−IN6 12
−IN(C)6 14
DTC6 15
Error
− ^Amp.5
+
+
1.26 V
SCP
− ^Comp.5
+
+
1.26 V
INV
Amp.6
−
+
Error
− ^Amp.6
+
+
1.26 V
SCP
− ^Comp.6
+
+
1.26 V
PWM
Comp.3
+
+
−
CH3
Drive
3
PWM
Comp.4
+
+
−
CH4
Drive
4
PWM
Comp.5
+
+
−
CH5
Drive
5
CH6
PWM
Comp.6
+
+
−
Drive
6
53 VCC(O)1, 2
52 OUT1-1
54 VSS(O)1, 2
50 OUT1-2
47 RB1
49 OUT1-3
51 VG(O)1
48 OUT1-4
46 GND(O)1
A
55 OUT2-1
57 OUT2-2
58 VCC(O)3, 4
60 OUT3
59 VSS(O)3, 4, 5, 6
61 OUT4
56 GND(O)2, 3, 4
64 VCC(O)5, 6, 7
62 OUT5
B
63 OUT6
FB7 5
−IN7-1 6
+IN7 8
−IN7-2 7
Error
− ^Amp.7
+
10 kΩ
Voffset
1.6 V
DTC7 9
−IN7(C)8 23
CTL1-4 CS CTL
CTL5 28
CTL6 29
Logic
Buff
Buff ×0.8
CS1-6 30
VB : 2 V
48.5 kΩ
PWM
− ^Comp.7
0.77 V −
+
30.1 kΩ
SCP
Comp.7
+
−
VSCP
0.9 V
SCP
− ^Comp.8
+
1.26 V
CH7
Drive
7
Power
+ Comp.
−
0.6 V
−1.8 V
−1.1 V
−1.8 V
−1.1 V
−0.8 V
−0.3 V
UVLO
1 OUT7
2 RB7
3 GND(O)5, 6, 7
C
4 XENB1-6
26 VCC
OSC
2V
32 33 34
VB RT CT
SCP
31
CSCP
Power
Ref ON/OFF
CTL
2.5 V
24
25
VREF GND
27 CTL1-4, 7
6