Datasheet M54685L Datasheet (Mitsubishi)

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

MITSUBISHI <CONTROL / DRIVER IC>

/

/

/

/

/

/

Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR

ELECTRICAL CHARACTERISTICS (Ta = 25˚C, Vcc = 6V, unless otherwise noted)

Symbol Test conditions

I

IH

IL

I
VOH

V

OL

Vref
IB

K

Vref

Vref

K

K

Vref

Vref

K

K

Vref

Vref

K

K

ICC(S)

ICC

“H” input current
“L” input current

“H” output voltage

“L” output voltage
Reference voltage

Bias current
Current proportional constant

Voltage characteristic (1)

VCC

VCC

Voltage characteristic (2)

IO2

Current characteristic (1)

IO2

Current characteristic (2)

Ta

Temperature characteristic (1)

Ta

Temperature characteristic (2)
Standby supply current

Supply current

Parameter

VIH = 5V

VIL = 0V
FF, REW mode I
PLAY mode I
FF, REW mode I
PLAY mode R

O2 = 40mA

I

O = -150mA

O = -150mA

O =150mA

a = 5

VCC = 4.5 – 14V
VCC = 4.5 – 14V,

I

O2 = 40mA

IO2 = 50 – 200mA

O2 = 50 – 200mA

I

a = -20 – 75˚C

T
Ta = -20 – 75˚C

O2 = 40mA

I

V

CC = 16V

FF, REW mode Output OPEN
PLAY mode Output OPEN
Brake mode Output OPEN

M54685L

Limits

Min. Typ. Max.

0.1

0.22

V

CC-1.1

V

CC-1.1

0.85

0

0.1

35

0

CC-0.9

V
VCC-0.9

0.2

1.2

1.00

1.3
40

0.1

0.2

0.02

0.01

0.01

0.01
0

17

5.0
30

V

VCC-0.7

0.4
10

CC-0.7

0.4

2

1.15

1.8
45

100

35

7.0
60

Unit

mA

µA

V

V
V

mA

%/V

%/V

%/mA

%/mA

%/˚C

%/˚C

µA

mA

TYPICAL CHARACTERISTICS

APPLICATION EXAMPLE

Thermal Derating

• When installed in the board; 50 x 50 x 0.8tmm
Glass epoxy board Copper foil area: 50%

• t means the power applied time and single pulse
is adopted.

3.0

t = 10sec

2.78

t = 30sec

2.0

t =

1.42

1.0

Power Dissipation Pd (W)

0

0 25 50 75 100

Ambient Temperature T

a (˚C)

47µH

10µF

CAUTIONS

• 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.

• When the motor back electromotive force is large with the brakes

VCC=6V

∗

Control signal

R

T(200 )

S(500 )

R

(20 )

(20 )

10

987654321

M

M54685L

Insert, if necessary.

∗

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.