MB3881
(Continued)
Pin No.
4
5
6
CH8
7
8
3
2
64
33
OSC
34
35
28
Symbol
FB8
−IN8
+IN8
−IN8
(C)
+IN8
(C)
DTC8
RB8
OUT8
RT
CT
SYNC
CTL-1
I/O
O
I
I
I
I
I
O
I
I
Error amplifier output pin.
Descriptions
Error amplifier inverted input pin.
Error amplifier non-inverted input pin.
Short detection comparator inverted input pin.
Short detection comparator non-inverted input pin.
Dead time control pin.
Output current setting pin.
Output pin.
Triangular wave frquency setting resistor connection pin.
Triangular wave frquency setting capacitor connection pin
External synchronous signal input pin.
Power supply, CH 1, 3, 4, 8 control circuit.
“H” level : Power supply operating mode
“L”level : Standby mode
CH 2 control circuit.
•CTL-1pin =
“H” level
“H” level : CH2 operating mode
“L” level : CH2 OFF mode
CH5, 6 control circuit.
•CTL-1pin =
“H” level
“H” level : CH5, CH6 operating mode
“L” level : CH5, CH6 OFF mode
CH7 control circuit.
•CTL-1pin =
“H” level
“H” level : CH7 operating mode
“L” level : CH7 OFF mode
Short protection circuit capacitor connection pin.
CH1, 2, 3, 4, 7 soft start circuit capacitor connection pin.
Reference voltage and control circuit power supply pin.
CH1, 2, 3, 4 output circuit power supply pin.
CH5, 6, 7, 8 output circuit power supply pin.
CH1, 2, 3, 4 output circuit power supply pin.
CH5, 6, 7 output circuit power supply pin.
CH1, 2 synchronous rectifier side output circuit power supply pin.
Refernce voltage output pin.
Triangular wave oscillator regulator output pin.
Ground pin.
CH1, 2, 3, 4 output circuit ground pin.
CH5, 6, 7, 8 output circuit ground pin.
29
CTL-2
I
Control
30
CTL-3
I
31
CTL-4
I
O
O
26
32
27
58
59
49
63
Power
52
24
36
25
55
1
CSCP
CS
VCC
VCC (O) -1
VCC (O) -2
VSS (O) -1
VSS (O) -2
VDD (O)
VREF
VB
GND
GND (O) -1
GND (O) -2
4
FUJITSU [ FUJITSU COMPONENT LIMITED. ]
