MITSUBISHI <CONTROL / DRIVER IC>
M54687FP
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR
DESCRIPTION
PIN CONFIGURATION (TOP VIEW)
The M54687FP is a semiconductor integrated circuit that is
capable of directly controlling the rotating direction and rotating
speed of a smallsize bi-directional motor rotating in both forward
and reverse directions.
PSC1
1
16
P-VCC Power supply
R input
R
2
15
O1
Output 1
S input
S
3
14
VR
High speed
control
FEATURES
● Capable of controlling the speed in forward and reverse rotating
directions
● Capable of controlling the speed in high speed mode
● Large output current drive (IO(max) =700mA)
● Built-in clamp diode
● Flat package (16P2N )
GND
M54687FP
Speed control 1
4
5
13
GND
12
L input
L
6
11
NC
Power supply
L-VCC
7
10
O2
Speed control 2 PSC2
8
9
P-VCC Power supply
Output 2
APPLICATION
Micro-cassette for phone-answering machine, AV equipment, and
other general consumption appliances
Outline 16P2N-A
NC: no connection
FUNCTION
The M54687FP is an IC that can control the forward rotation,
reverse rotation and speed of small DC brush motor.
For the basic operation of this IC, output modes are selected, as
shown in the logic truth table, by entering appropriate H/L level into
the R, L and S inputs.
Two resistances are put between the output pin and the PSC pin
and the resistance ratios are appropriately adjusted to perform the
speed control.
In addition to the above, speed control can be done by varying the
voltage at VR pin, in the high speed mode.
LOGIC TRUTH TABLE
R
H
H
L
L
H
L
H
L
Output
Input
L S O1 O2
H H H FG
G
L H H
H H FG H
L H G
H
L
L
H L
L L OFF OFF
L L
H L
Mode
FF
PLAY
REW
REV
BRAKE
STB
Forward rotation high speed governor
Forward rotation governor
Reverse rotation high speed governor
Reverse rotation governor
Brake operation
Standby mode output high imp.
Reserved
G: Governor control output mode
FG: Rotating speed controllable with the voltage at VR pin (However, the
precision is worse than G.)
BLOCK DIAGRAM
Output 1
O1
15
Speed control 1
PSC1
1
Output 2
O2
10
Speed control 2 Power supply
PSC2
VCC
8
Activation circuit
(–)
Control circuit
2
R
R input
6
L
L input
Reference
voltage
(–)
Constant voltage,
Constant current
Reference
voltage
High Speed
control
VR 14
3
S
S input
4 5 12 13
GND
7 9 16
MITSUBISHI <CONTROL / DRIVER IC>
M54687FP
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR
ABSOLUTE MAXIMUM RATINGS ( Ta=25°C, unless otherwise noted )
Symbol
VCC
VI
VO
IOP
IO
Pd
Topr
Tstg
Parameter
Supply voltage
Input voltage
Output voltage
Allowable motor rush current
Continuous output current
Power dissipation
Operating temperature
Storage temperature
Ratings
Conditions
tON 100ms, duty of 1% or less.
However, Pd must not exceed the maximum rating.
When mounted in board
RECOMMENDED OPERATING CONDITION ( Ta=25˚C, unless otherwise noted)
Symbol
VCC
VIH
VIL
VR
∗ IO
Parameter
Supply voltage
“H” input voltage
“L” input voltage
VR control voltage range∗
200mA when FF/REW speed is controlled.
Min.
6.0
2.0
0
0
Limits
Typ.
9.0
Max.
13.0
VCC
0.4
VCC
Unit
V
V
V
V
-0.5 – +14
-0.5 – VCC
-0.5 – VCC+2
±700
±200
1.14
-20 – 75
-40 – 125
Unit
V
V
V
mA
mA
W
˚C
˚C
MITSUBISHI <CONTROL / DRIVER IC>
M54687FP
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR
ELECTRICAL CHARACTERISTICS ( Ta=25°C, unless otherwise noted )
Symbol
Parameter
Test conditions
IO(leak)
Output leak current
VCC = 14V, VO = 14V
Standby mode
II
VOH
Input current
“H” output voltage
VOL
“L” output voltage
VI = 5.0V
IO = -200mA, VR = 5.0V
IO = 200mA, VR = 0V, Vpsc = 2.5V
FF / REW / BRAKE mode
Vref
/ IO
Vref
K
/ IO
K
Vref
/ Ta
Vref
K
/ Ta
K
Vref II
Vref
/ VCC
Vref
Vref
/ IO
Vref
Vref
/ Ta
Vref
IB
IR
FF/REW
PLAY/REV
BRAKE
STAND BY
Reference voltage
Bias current
Current proportional constant
Voltage
characteristics
Current
characteristics
Temperature
characteristics
Reference voltage
K
/ VCC
K
Governor characteristics (I)
PLAY•REV mode
Vref
/ VCC
Vref
Supply
current
Governor characteristics
(II) FF•REW
ICC1
ICC2
ICC3
ICC4
Vref
IB
K
Output open
Output open
Output open
IO = 40mA
Min.
Limits
Typ.
Max.
0
100
µA
1.0
–
mA
V
0
0.4
VCC-1.2 VCC-0.9
Unit
–
0.22
0.5
V
–
–
–
–
0.95
0.7
18
5.0
5.0
35
0
1.0
1.2
20
8.0
8.0
48
10.0
1.05
1.7
22
mA
mA
mA
µA
V
mA
–
Vref
VCC = 6.0 – 13V
0.1
%/V
K
VCC = 6.0 – 13V
IO = 40mA
0.2
%/V
Vref
IO = 50 – 200mA
0.02
%/mA
K
IO = 50 – 200mA
0.01
%/mA
Vref
Ta = -20 – 75˚C
0.01
%/˚C
K
Ta = -20 – 75˚C
0.01
%/˚C
VR = 0.3V
2.0
V
Voltage
characteristics
VR = 0.3V
VCC = 6.0 – 13V
3.0
%/V
Current
characteristics
VR = 0.3V
IO = 50 – 200mA
0.2
%/mA
Temperature
characteristics
VR = 0.3V
Ta = -20 – 75˚C
0.1
%/˚C
Bias current
VR input current
VR = 0.3V
VR = 0V
0.7
0
1.3
-5.0
1.8
-20
mA
µA
MITSUBISHI <CONTROL / DRIVER IC>
M54687FP
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR
APPLICATION EXAMPLE
• When the normal speed is set to 2000rpm, and the high speed
is set to 3500rpm
2k
RS
∗
VCC = 9.0V
0.1µF
RT 300
RT
∗
VCC = 5.0V
∗
/ / 5.6 k
∗
10µF
M
PSC1
20k
O2
O1
PSC2
VCC
∗
VR
∗
Control circuit
R
P-G
L
Control signal
S
L-G
∗ Install at a position close to the IC, if possible.
, Generation constant Ka = 2.57
3000
is used for temperature compensation to take measures against hunting at low temperature.
Motor: Armature resistance R a = 14
RT: The resistance of 300
(–)
Reference
voltage
Activation circuit
(–)
Constant voltage,
Constant current
Reference
voltage
1k
MITSUBISHI <CONTROL / DRIVER IC>
M54687FP
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR
Speed Control Method
(1) Speed Control Method I (See the application circuit drawing.)
(3) Speed Control Method III (to increase the precision of forward
rotation and reverse rotation)
For PLAY/REV
Rotation number can be expressed by the following formula:
N= 1 {IB • RT+Vref (1+ RT )+la( RT -Ra)} • • • • • • (1)
Ka
RT+RS
K
Where:
Motor generation constant: Ka, Motor armature resistance: Ra,
Rotation number: N
K: Current proportional constant, IB: PSC pin bias current,
Ia:motor current
RT, RS: External resistance
In addition, to set the rotation number with RS, external
resistance RT is generally set as follows:
RT K x Ra
For FF/REW
Note that the rotation number is basically controlled with the
same expression as formula (1) but different reference voltage
Vref and different bias current IB are to be used.
However, Vref = 5VR+0.5
(2) Speed Control Method II (to increase the motor rotation number)
RS
RT
O1
R
L
RT1
RT2
RS2
M
PSC1
O1
R
L
O2
S
PSC2
VR
VCC
L-G
P-G
Control signal
RT
M
PSC1
RS1
O2
S
PSC2
VR
VCC
L-G
P-G
Control signal
In the external circuit above, the voltage across motors is almost
determined by the ratio of ‘RS+RT’ to ‘RT’ and, therefore, a value
set for the voltage across motors is not so large.
As method (1) of speed control I, the rotation number can be
controlled.
However, the following relations must be satisfied:
RT RT+RS
RS+RT RT
The above two applications cannot make fine adjustments in
forward rotation and reverse rotation (because the external
resistance is shared with the forward rotation and reverse rotation).
Fine adjustments can be made for each of forward rotation and
reverse rotation if the external circuit is set as shown in the drawing
above.
This external circuit is also available to change the speed of
forward and reverse rotation.
The control method adopts the same formula as formula (1).
However, the following relations must be satisfied:
RT+RS RS1 or RS2
RT RT1 or RT2
MITSUBISHI <CONTROL / DRIVER IC>
M54687FP
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR
(1) Oscillation may take place with the setting of RT>K•Ra. Set
R K • Ra.
(2) Add a capacitor of 0.1µF to the portion between PSCs to
reduce brush noise of the motor.
(3) Add a capacitor of 10µF to the portion between VCC and GND
to reduce brush noise and back electromotive noise of the
motor.
(4) At a low temperature, RT>K•Ra is set due to temperature
characteristics of resistance Ra of the motor. When oscillation
takes place, use resistance with a temperature coefficient for
RT.
(5) When the supply voltage is low, note that saturation of the
output transistor of the IC may prevent the rotating speed for
control. Taking into account motor noise etc., set constants in
the following range.
2.0V
VCC - (EC+Ia • Ra)
RT
= VCC - {RT • IB + Vref(1+ RT )+
K
RS
•
Ia}
When the 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.
TYPICAL CHARACTERISTICS
Thermal Derating (Absolute Maximum Rating)
2.0
Power Dissipation Pd (W)
CAUTIONS
1.5
When mounted in board
1.0
0.5
0
0
25
50
75
Operating Temperature Ta (˚C)
100