Mitsubishi M54685L Datasheet
MITSUBISHI <CONTROL / DRIVER IC>
)
M54685L
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR
DESCRIPTION
The M54685L is a semiconductor integrated circuit that is capable
of directly driving a smallsize bi-directional motor rotating in both
forward and reverse directions.
FEATURES
●Wide range of operating voltage (VCC = 4.5 – 14V)
●Possible direct driving with TTL, PMOS and CMOS outputs
●Small outline (10-pin SIP)
●Built-in clamp diode
●Low output saturation voltage (large voltage across motors)
●Large output current drive (IO(max) = 500mA)
●Provided with brake functions
●Built-in thermal shutdown protection circuit
APPLICATION
Micro-cassette for phone-answering machine, tape deck, radio
cassette, and other sound equipment, and VTR and general
consumption appliances
FUNCTION
The M54685L 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 at right, by applying appropriate TTLlevel input to R, L and STB inputs.
The PLAY mode is a mode where speed is controllable and is used
to control the speed of motor by using two resistances, RT and RS,
as shown in the application example. RT and RS are generally
given by the following formulae:
RT = K•Ra (K: current proportional constant, Ra: Motor armature
resistance)
RS = Ka•N/IB (N: rotating speed, Ka: Motor generation constant, IB:
PSC bias current)
FSC and RSC are pins to connect resistance that restricts the
rotating speed in FF and PLAY.
PIN CONFIGURATION(TOP VIEW
Output 1
FF speed control
REW speed control
Output 2
Speed control
R input
L input
Standby input
Power supply
O
FSC
RSC
O
GND
PSC
STB
V
1
2
R
L
CC
1
2
3
4
5
6
7
8
9
10
Outline 10P5
LOGIC TRUTH TABLE
R
LLH
L
H
H
L
H
L
H
STB
High speed forward rotation (FF)
H
GOVERNOR forward rotation (PLAY)
High speed reverse rotation (REW)
H
H
Brake
Standby
L
M54685L
Mode
BLOCK DIAGRAM
Power supply
10
Governor
circuit
Control circuit
(Thermal protection circuit)
7
R input L input Standby input FF speed control REW speed control
98
Output 2 Output 1
O
2VCC PSC
4
O1
16
52
RSCGNDFSCSTBLR
3
MITSUBISHI <CONTROL / DRIVER IC>
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR
PIN FUNCTION NAME
Pin No.
1
2
3
4
5
6
7
8
9
10
Pin name Name
O1
FSC
RSC
2
O
GND
PSC
R
L
STB
V
CC
Output pin for motor driving
Fast forward rotating speed adjustment pin
Fast reverse rotating speed adjustment pin
Output pin for motor driving
Ground
Governor forward rotation speed control pin
Output mode selection input pin
Output mode selection input pin
Standby input pin (power save function)
Power supply
ABSOLUTE MAXIMUM RATINGS (Ta = 25˚C, unless otherwise noted)
Symbol
CC
V
VI
VO
IOp
O
I
Pd
Topr
Supply voltage
Input voltage
Output voltage
Allowable motor rush current
Continuous output current
Power dissipation
Operating temperature
Parameter
t
ON 5sec, duty of 10% or less
However, Pd must not exceed the maximum rating
T
a = 50˚C, when mounted in glass epoxy board
Tstg Storage temperature
Note 1: When mode is switched to FF or REW mode, up to 1.0A is allowed as sink current (I
Conditions
OL) with tON 100ms.
M54685L
Ratings
-0.5 – 16
CC
-0.5 – V
-0.5 – VCC+2.5
±500 (Note 1)
±200
1.2
-20 – 75
-40 – 125 ˚C
Unit
V
V
V
mA
mA
W
˚C
RECOMMENDED OPERATING CONDITION (Ta = 25˚C, unless otherwise noted)
Symbol
VCC
VIH
VIL
Parameter
Supply voltage
“H” input voltage
“L” input voltage
2.0
0
Limits
6.04.5
MaxTypMin
14
VCC
0.4
Unit
V
V
V
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