MITSUBISHI <CONTROL / DRIVER IC>
M54641L/FP
Bi-DIRECTIONAL MOTOR DRIVER WITH BRAKE FUNCTION
DESCRIPTION
The M54641 is a semiconductor integrated circuit that is capable of
directly driving a smallsize bi-directional motor rotating in both
forward and reverse directions.
PIN CONFIGURATION (TOP VIEW)
Power supply V
CC
Output 2
O
2
IN
1
GND
Output voltage
control
Input 2
Output 1
V
Z
IN
2
O
1
1
2
3
FEATURES
q
Wide range of operating voltage (V
CC
= 4 – 10V,V
CC
’
(max)
= 20V)
q
Low output saturation voltage in stationary motor circuit (large
voltage across motors)
q
Built-in clamp diode
q
Provided with output voltage control pin (V
Z
)
q
Built-in thermal shutdown circuit (T
j(shut)
= 120˚C standard)
Input 1
M54641L
4
5
6
7
8
APPLICATION
Sound equipment such as tape deck and radio cassette, and VTR
Output power V
CC
’
supply
Outline 8P5
FUNCTION
The M54641 is an IC for driving a smallsize bi-directional motor
that rotates in both forward and reverse directions. Giving signal to
inputs IN
1
and IN
2
outputs the signal of the same phase to output
pins O
1
and O
2
. That is, giving high-level signal to input IN
1
and
low-level signal to input IN
2
sets output O
1
to high-level and output
O
2
to low-level. Connection of a motor between output pins O
1
and
O
2
uses O
1
as an output current source and O
2
as an output
current sink to rotate the motor. In addition, giving the reverse
signal to inputs IN
1
and IN
2
sets O
1
and O
2
to low-level and high-
level, respectively, resulting in rotating the motor reversely.
However, when both IN
1
and IN
2
are set to “H”, both O
1
and O
2
are
set to low-level, resulting in sudden stop of motor rotation. (Brake
mode)
If the Zener diode of certain voltage, for example, is added to the
V
Z
pin, the output “H” voltage does not rise over the Zener voltage
and the motor rotates at constant speed.
If the V
Z
pin is connected to the output power supply V
CC’
pin, the
rotating speed of the motor can be varied by varying the V
CC’
voltage.
The motor rush current and the current with the motor put in
stationary status are as follows: I
op(max)
= 800mA and I
O(max)
=
150mA.
Output voltage
control
Input 2
Output 1
V
Z
IN
2
O
1
1
2
3
4
5
6
7
8
9
10
GND
IN
1
O
2
Input 1
Output 2
M54641FP
Output power V
CC
’
supply
NC
V
CC
Power supply
NC
Outline 10P2-C
NC: no connection
LOGIC TRUTH TABLE
Input
IN
1
L
H
L
H
IN
2
L
L
H
H
O
1
“OFF”
state
Output
O
2
“OFF”
state
Remarks
No operation of IC
ex
Forward rotation
Reverse rotation
Brake
H
L
L
L
H
L
BLOCK DIAGRAM
Power supply
V
CC
Output power supply
V
CC
’
Constant voltage
source
V
Z
Output voltage control
Input 1 IN
1
Input
circuit
Control
circuit
Output
circuit
O
2
Output 2
Input 2 IN
2
Input
circuit
Output
circuit
O
1
Output 1
GND
MITSUBISHI [ MITSUBISHI ELECTRIC SEMICONDUCTOR ]
