Fujitsu MB3887 Manual Do Utilizador
MB3887
4
■
PIN DESCRIPTION
Pin No.
Symbol
I/O
Descriptions
1
−
INC2
I
Current detection amplifier (Current Amp2) input terminal.
2
OUTC2
O
Current detection amplifier (Current Amp2) output terminal.
3
+
INE2
I
Error amplifier (Error Amp2) non-inverted input terminal.
4
−
INE2
I
Error amplifier (Error Amp2) inverted input terminal.
5
FB2
O
Error amplifier (Error Amp2) output terminal.
6
VREF
O
Reference voltage output terminal.
7
FB1
O
Error amplifier (Error Amp1) output terminal.
8
−
INE1
I
Error amplifier (Error Amp1) inverted input terminal
9
+
INE1
I
Error amplifier (Error Amp1) non-inverted input terminal.
10
OUTC1
O
Current detection amplifier (Current Amp1) output terminal.
11
OUTD
O
With IC in standby mode, this terminal is set to “Hi-Z” to prevent loss
of current through output voltage setting resistance.
Set CTL terminal to “H” level to output “L” level.
of current through output voltage setting resistance.
Set CTL terminal to “H” level to output “L” level.
12
−
INC1
I
Current detection amplifier (Current Amp1) input terminal.
13
+
INC1
I
Current detection amplifier (Current Amp1) input terminal.
14
CTL
I
Power supply control terminal.
Setting the CTL terminal at “L” level places the IC in the standby
mode.
Setting the CTL terminal at “L” level places the IC in the standby
mode.
15
FB3
O
Error amplifier (Error Amp3) output terminal.
16
−
INE3
I
Error amplifier (Error Amp3) inverted input terminal.
17
RT
Triangular-wave oscillation frequency setting resistor connection
terminal.
terminal.
18
VCC
Power supply terminal for reference power supply and control circuit.
19
VH
O
Power supply terminal for FET drive circuit (VH
=
VCC
−
6 V) .
20
OUT
O
External FET gate drive terminal.
21
VCC (O)
Output circuit power supply terminal.
22
CS
Soft-start capacitor connection terminal.
23
GND
Ground terminal.
24
+
INC2
I
Current detection amplifier (Current Amp2) input terminal.