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MITSUBISHI
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.
PIN CONFIGURATION (TOP VIEW)
Output 1 FF speed control O1 FSC RSC O2 GND Speed control R input L input Standby input Power supply PSC R L STB VCC 1 2 3 4
FEATURES
q Wide range of operating voltage (VCC = 4.5 - 14V) q Possible direct driving with TTL, PMOS and CMOS outputs q Small outline (10-pin SIP) q Built-in clamp diode q Low output saturation voltage (large voltage across motors) q Large output current drive (IO(max) = 500mA) q Provided with brake functions q Built-in thermal shutdown protection circuit
REW speed control Output 2
M54685L
5 6 7 8 9 10
APPLICATION
Micro-cassette for phone-answering machine, tape deck, radio cassette, and other sound equipment, and VTR and general consumption appliances
Outline 10P5
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.
LOGIC TRUTH TABLE
R L L H H L L H L H STB H H H H L Mode High speed forward rotation (FF) GOVERNOR forward rotation (PLAY) High speed reverse rotation (REW) Brake Standby
BLOCK DIAGRAM
Power supply VCC 10
PSC 6
Output 2 O2 4
Output 1 O1 1
Governor circuit
Control circuit (Thermal protection circuit)
7 R R input
8
9
2 FSC FF speed control
5 GND
3 RSC REW speed control
L STB L input Standby input
MITSUBISHI
M54685L
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR
PIN FUNCTION NAME
Pin No.
1 2 3 4 5 6 7 8 9 10
Pin name O1 FSC RSC O2 GND PSC R L STB VCC
Name 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 = 25C, 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 Conditions Ratings -0.5 - 16 -0.5 - VCC -0.5 - VCC+2.5 500 (Note 1) 200 1.2 -20 - 75 -40 - 125 Unit V V V mA mA W C C
tON 5sec, duty of 10% or less However, Pd must not exceed the maximum rating Ta = 50C, when mounted in glass epoxy board
Note 1: When mode is switched to FF or REW mode, up to 1.0A is allowed as sink current (IOL) with tON 100ms.
RECOMMENDED OPERATING CONDITION (Ta = 25C, unless otherwise noted)
Symbol VCC VIH VIL Parameter Supply voltage "H" input voltage "L" input voltage Min 4.5 2.0 0 Limits Typ 6.0 Max 14 VCC 0.4 Unit V V V
MITSUBISHI
M54685L
Bi-DIRECTIONAL MOTOR DRIVER WITH GOVERNOR
ELECTRICAL CHARACTERISTICS (Ta = 25C, Vcc = 6V, unless otherwise noted)
Symbol IIH IIL VOH VOL Vref IB K Vref / VCC Vref K / VCC K Vref / IO2 Vref K / IO2 K Vref Vref / Ta K / Ta 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) Voltage characteristic (2) Current characteristic (1) Current characteristic (2) Temperature characteristic (1) Temperature characteristic (2) Standby supply current Supply current Parameter Test conditions VIH = 5V VIL = 0V FF, REW mode IO = -150mA PLAY mode IO = -150mA FF, REW mode IO =150mA PLAY mode Ra = 5 Limits Min. Typ. Max. 0.4 0.1 0.22 0 10 0 VCC-1.1 VCC-0.9 VCC-0.7 VCC-1.1 VCC-0.9 VCC-0.7 0.1 0.2 0.4 1.2 2 0.85 1.00 1.15 1.8 1.3 35 40 0.1 0.2 0.02 0.01 0.01 0.01 0 Output OPEN Output OPEN Output OPEN 17 5.0 30 100 35 7.0 60 45 %/V %/V %/mA %/mA %/C %/C A mA Unit mA A V V V mA
IO2 = 40mA VCC = 4.5 - 14V VCC = 4.5 - 14V, IO2 = 40mA IO2 = 50 - 200mA IO2 = 50 - 200mA Ta = -20 - 75C Ta = -20 - 75C IO2 = 40mA VCC = 16V FF, REW mode PLAY mode Brake mode
TYPICAL CHARACTERISTICS
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.
APPLICATION EXAMPLE
VCC=6V Control signal RT(200 ) 47H
Power Dissipation Pd (W)
3.0 t = 10sec 2.78
RS(500 ) M
2.0 1.42 1.0
t = 30sec t=
10F
(20 ) (20 )
10
9
8
7
6
5
4
3
2
1
M54685L
0 0 25 50 75 100
Ambient Temperature Ta (C)
Insert, if necessary.
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 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. 10s.

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