Pin description, Mb3788 – FUJITSU MB3788 User Manual
Page 3
MB3788
3
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PIN DESCRIPTION
Note: The alphabetic characters in parenthesis above indicate the following input pins.
(C): Comparator
(E): Error amplifier
Pin No.
Pin name
I/O
Descriptions
Channel 1
2
OUT1
O
Channel 1 push-pull type output
3
VE1
I
Channel 1 output current setting
4
Ca1
—
Channel 1 output transistor OFF current setting: Output transistor OFF
The current is set by connecting a capacitor between pins Ca1 and Cb1.
5
Cb1
—
6
FB1
O
Channel 1 error amplifier output
7
-IN1(E)
I
Channel 1 error amplifier inversion input
8
+IN1(E)
Channel 1 error amplifier non-inversion input
9
-IN1(C)
I
Channel 1 comparator inversion input
Channel 2
16
-IN2(C)
I
Channel 2 comparator inversion input
17
+IN2(E)
I
Channel 2 error amplifier non-inversion input
18
-IN2(E)
I
Channel 2 error amplifier inversion input
19
FB2
O
Channel 2 error amplifier output
20
Ca2
—
Channel 2 output transistor OFF current setting: Output transistor OFF
The current is set by connecting a capacitor between pins Ca2 and Cb2.
21
Cb2
—
22
VE2
I
Channel 2 output current setting
23
OUT2
O
Channel 2 push-pull type output
Control
circuit
13
CTL1
I
Power and channel 1 control pin
H level: Power and channel 1 operating
L level: Standby
14
CTL2
I
Channel 2 control pin
When CTL1 pin = H level,
H level: Channel 2 operating
L level: Channel 2 OFF
15
SCP
—
Short-circuit protection circuit capacitor connection
Power
circuit
1
V
CC
2
—
Output circuit power pin
10
-IN(PWM)
I
Master oscillating waveform input
11
V
CC1
—
Reference power and control circuit power
12
V
REF
O
Reference voltage output
24
GND
—
Ground