MITSUBISHI <CONTROL / DRIVER IC>
M54649L
DUAL Bi-DIRECTIONAL MOTOR DRIVER
DESCRIPTION
The M54649L is a semiconductor integrated circuit that is capable
of directly driving two smallsize bi-directional motors rotating in
both forward and reverse directions.
PIN CONFIGURATION (TOP VIEW)
1
FEATURES
O2
2
● Capable of driving two motors in both forward and reverse
directions
● Equipped with “H” output voltage control pin
● Built-in thermal protection circuit
● Large output current drive (IO(max) = 1.6A)
● Wide range of operating supply voltage (VCC = 4 – 18V)
● Capable of directly driving with CMOS IC output
Output 3
O3
3
Input 1
IN1
4
Input 2
IN2
5
Input 3
IN3
6
Power supply 1
VCC1
7
APPLICATION
Sound equipment such as tape deck and radio cassette, VTR, and
other general consumer appliances
M54649L
GND
Output 2
Input for output control
VR
8
Power supply 2 for output
VCC2
9
Output 1
O1
10
FUNCTION
Outline 10P5
The M54649L consists of input circuit, control circuit, constant
current circuit and output circuit.
Two motors are connected to the IC; both of them are connected to
output pin O1, and one is connected to output O2, and the other is
connected to output O3. The motors are controlled by three input
levels of input pins IN1 to IN3. As shown in the logic truth table, the
control statuses of ‘forward rotation’, ‘reverse rotation’, ‘brake’ and
‘OFF’ are selectable.
The input circuit provides hysteresis functions that prevent
malfunction due to rounding at rising edge and falling edge of input
signals.
Both the current source side and sink side of the output circuit
adopt Darlington circuit configuration of the NPN transistor,
allowing up to ±1.6A output current to flow.
In addition, the IC contains a thermal protection circuit to put all
outputs in the “OPEN” mode for preventing the IC from thermal
braking when failures such as motor lock occurs.
BLOCK DIAGRAM
VCC2 Power supply 2 for output
VR
Input for output control
O1
Output 1
O2
Output 2
O3
Output 3
GND
Input 1 IN1
Input 2 IN2
Input 3 IN3
Control circuit
Constant current
circuit (thermal
shutdown circuit)
VCC1
MITSUBISHI <CONTROL / DRIVER IC>
M54649L
DUAL Bi-DIRECTIONAL MOTOR DRIVER
LOGIC TRUTH TABLE
IN1
Input
IN2
L
L
H
H
L
L
L
L
H
H
H
H
IN3
L
H
L
H
L
H
L
H
O1
Output
O2
O3
L
L
L
H
L
H
L
L
H
OPEN
OPEN
OPEN
OPEN
L
H
L
L
L
Remarks
Brake
Brake
ABSOLUTE MAXIMUM RATINGS (Ta = 25°C, unless otherwise noted)
Symbol
VCC(1)
VCC(2)
VI
VO
IOP
IO
Pd
Topr
Tstg
Parameter
Supply voltage(1)
Supply voltage(2)
Input voltage
Output voltage
Motor rush current
Continuous output current
Power dissipation
Operating temperature
Storage temperature
Conditions
Ratings
-0.5 – +20.0
-0.5 – +22.0
-0.5 – +7.0
-2.0 – VCC+2.5
±1.60
±600
2.78
-20 – 75
-55 – 125
VCC(1) or less
top 50ms ; duty of 1/50
(Note 1)
Power apply time of 10sec or less
Unit
V
V
V
V
A
mA
W
˚C
˚C
Note 1: Pay attention to Pd when the IC operations in the stationary status.
RECOMMENDED OPERATING CONDITION (Ta=25°C, unless otherwise noted)
Symbol
VCC(1)
VCC(2)
IO
VIH
VIL
VR
TON
TON-OFF
Parameter
Conditions
Min.
4.0
0.0
Supply voltage(1)
Supply voltage(2)
Output current
“H”input voltage
“L” input voltage
Control voltage
Thermal shutdown temperature
Hysteresis temperature width
3.5
0.0
0.0
125
Limits
Typ.
12.0
Max.
18.0
22.0
±600
VCC
1.0
18.0
150
50
Unit
V
V
mA
V
V
V
˚C
˚C
ELECTRICAL CHARACTERISTICS (Ta=25°C, unless otherwise noted)
Symbol
Parameter
IO(leak)
VOL
VOH
VO
IR
Output leak current
“ L” output saturation voltage
“H” output saturation voltage
Output offset voltage
8-pin output current
ICC1
Supply current
Test conditions
Output OPEN status VO = 0 or 20V
IOL = 500mA
IOH = -500mA
IO = ±500mA VR = 6.0V
IO = ±500mA VR = 6.0V
VIN1,2,3 = 1.0V
IO = 0mA Output OPEN
Min.
VCC1,2 = 20V
VCC1,2 = 12V
VCC1,2 = 12V
VCC1,2 = 12V
VCC1,2 = 12V
VCC1,2 = 12V
Limits
Typ.
10.0
-0.5
0.2
8.0
Max.
±100
1.5
Unit
0.5
1.5
µA
V
V
V
mA
24.0
mA
MITSUBISHI <CONTROL / DRIVER IC>
M54649L
DUAL Bi-DIRECTIONAL MOTOR DRIVER
TYPICAL CHARACTERISTICS
Thermal Derating
(Absolute Maximum Rating)
4.0
•
•
•
•
When the minimum value of thermal protection temperature is 125˚C
When installed in the board; 50 x 50 x 0.8mm
Glass epoxy board Copper foil area : 50%
t means the power applied time and single pulse is adopted.
Power Dissipation (W)
3.0 t = 10sec
2.78
t = 30sec
2.0
1.42
t=
1.0
0
0
25
50
100
75
Ambient Temperature Ta (°C)
APPLICATION EXAMPLE
CM
: Capacitor for noise absorption when the motor rotates.
Use the IC with CM set to 0.1µF or less.
RO
: Resistance for current limitation with the output shortcircuited.
Use the IC with RO set to 2 to 3 (1 Watt class or higher).
R1
R2
: Resistance for setting “H” output voltage.
“H” output voltage VO(H) is given by the following formula:
M54649L
GND O2 O3
1
2
3
IN1 IN2 IN3 VCC1 VR VCC2 O1
4
5
6
7
8
9
10
RO
CR
Control
signal
30µF
VO(H) = VCC1 x
16V
CM
CM
M
M
R2
R1+R2
As the resistance values of R1 and R2 are larger,VO(H) for
the output current of VR is higher than the set value.
12V
R1
10µF
R2
CR
: When another power supply is used for VR voltage,output
voltage may be oscillated. When this is the case, connect
capacitor CR (approx. 0.01µF) to a portion between VR
and VCC2.
MITSUBISHI <CONTROL / DRIVER IC>
M54649L
DUAL Bi-DIRECTIONAL MOTOR DRIVER
CAUTIONS
1. Input Circuit Format
For ON voltage (VIH), apply a voltage of 3.5V to VCC1. For OFF
voltage (VIL), apply a voltage of 0 to 1V.
When the input voltage is approx. 7.8V or more, the impedance
changes to approx. 5 k . Therefore, set the voltage to 7V or less.
VCC1
To internal circuit
Collector current IC (A)
6. ASO Curve
2.0
1.6
Time of continuity : 50msec
1.0
0
0
4
8
12
14
16
20
Voltage between collector and emitter : VCE (V)
5k
NC
VZ
∼
– 7.8V
10k
From internal
circuit
GND
2. Output Voltage Control
The output control circuit by VR pin is as shown in the diagram
below. A voltage almost equal to the voltage at VR pin is output (to
the high-level side).
The maximum output voltage is achieved with VCC2 VCC1 when VR
pin is opened, and the voltage is given by the following formula:
VO = VCC1-Vsat(Tr1)-VBE(Tr2)-VBE(Tr3)
In this status, the output voltage can be controlled by varying VCC1.
VCC1
Tr1
VCC2
Tr2
Tr3
OUT
VR
3. Caution for Braking
As soon as the status of a rotating motor is switched to the brake
status, other motor may be adversely affected. Be careful when
the IC is actually used.
4. Allowable Power Dissipation
The allowable power dissipation of IC (Pd) is calculated by the
following formula, with VCC2 VCC1:
Pd = VCC1xICC1+IO {(VCC2-VOH)+VOL}
Make a design in such a way that the power dissipation cannot
exceed the maximum allowable power dissipation.
5. Thermal Shutdown
To prevent thermal breaking with excessive power applied, this IC
is equipped with a thermal shutdown circuit.
When the temperature of the IC chip reaches 150˚C (125˚C min.),
this function works. When the IC is placed in the all output OPEN
mode, and the temperature goes down to 100˚C (125˚C max.), this
function is released.
Since the thermal protection function of this IC may not work in
abnormal status (oscillation, low supply voltage, output shortcircuit, etc.), check the operation in the IC installation status when
using this function.
7. Others
The capacitance between the power supply and the ground should
be placed at a position close to the IC, if possible. If it is placed far
away from the IC, oscillation may take place.
When the motor back electromotive force is large with the brakes
applied, for example, malfunction may occur in internal parasitic Di.
If flyback current of 1A or more flows, add Schottky Di to the
portion between the output and the GND.
When the IC is used at a high speed for PWM, etc., note that
switching of output results in delay of approx. 10µs.