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MITSUBISHI
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)
GND Output 2 Output 3 Input 1 Input 2 Input 3 Power supply 1 Input for output control Power supply 2 for output Output 1 O2 O3 IN1 IN2 IN3 VCC1 VR VCC2 O1 1 2 3 4
FEATURES
q Capable of driving two motors in both forward and reverse directions q Equipped with "H" output voltage control pin q Built-in thermal protection circuit q Large output current drive (IO(max) = 1.6A) q Wide range of operating supply voltage (VCC = 4 - 18V) q Capable of directly driving with CMOS IC output
M54649L
5 6 7 8 9 10
APPLICATION
Sound equipment such as tape deck and radio cassette, VTR, and other general consumer appliances
FUNCTION
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.
Outline 10P5
BLOCK DIAGRAM
VCC2 Power supply 2 for output
VR O1 O2 O3 GND
Input for output control Output 1 Output 2 Output 3
Input 1 IN1 Input 2 IN2 Input 3 IN3 Control circuit
Constant current circuit (thermal shutdown circuit)
VCC1
MITSUBISHI
M54649L
DUAL Bi-DIRECTIONAL MOTOR DRIVER
LOGIC TRUTH TABLE
IN1 L H H L L H Input IN2 L L L H H H IN3 L H L H L H L H O1 L H L H L L Output O2 L L H OPEN OPEN L O3 L OPEN OPEN L H L Brake Remarks Brake
ABSOLUTE MAXIMUM RATINGS (Ta = 25C, 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 Unit V V V V A mA W C C
VCC(1) or less top 50ms ; duty of 1/50 (Note 1) Power apply time of 10sec or less
Note 1: Pay attention to Pd when the IC operations in the stationary status.
RECOMMENDED OPERATING CONDITION (Ta=25C, unless otherwise noted)
Symbol VCC(1) VCC(2) IO VIH VIL VR TON TON-OFF Parameter Supply voltage(1) Supply voltage(2) Output current "H"input voltage "L" input voltage Control voltage Thermal shutdown temperature Hysteresis temperature width Conditions Min. 4.0 0.0 3.5 0.0 0.0 125 Limits Typ. 12.0 Max. 18.0 22.0 600 VCC 1.0 18.0 Unit V V mA V V V C C
150 50
ELECTRICAL CHARACTERISTICS (Ta=25C, unless otherwise noted)
Symbol IO(leak) VOL VOH VO IR ICC1 Parameter Output leak current " L" output saturation voltage "H" output saturation voltage Output offset voltage 8-pin output current 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 VCC1,2 = 20V VCC1,2 = 12V VCC1,2 = 12V VCC1,2 = 12V VCC1,2 = 12V VCC1,2 = 12V Min. Limits Typ. Max. 100 1.5 0.5 1.5 8.0 24.0 Unit A V V V mA mA
10.0 -0.5 0.2
MITSUBISHI
M54649L
DUAL Bi-DIRECTIONAL MOTOR DRIVER
TYPICAL CHARACTERISTICS
Thermal Derating (Absolute Maximum Rating)
4.0
* * * * When the minimum value of thermal protection temperature is 125C 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 1.0 t=
0
0
25
50
75
100
Ambient Temperature Ta (C)
APPLICATION EXAMPLE
CM RO
: Capacitor for noise absorption when the motor rotates. Use the IC with CM set to 0.1F or less. : Resistance for current limitation with the output shortcircuited. Use the IC with RO set to 2 to 3 (1 Watt class or higher). : Resistance for setting "H" output voltage. "H" output voltage VO(H) is given by the following formula: VO(H) = VCC1 x R2 R1+R2
M54649L
GND O2 O3 1 Control signal CM 2 3 IN1 IN2 IN3 VCC1 VR VCC2 O1 4 5 6 7 8 CR 30F 9 10 RO 16V
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.
R1 R2 12V 10F
CM
M M
CR
: When another power supply is used for VR voltage,output voltage may be oscillated. When this is the case, connect capacitor CR (approx. 0.01F) to a portion between VR and VCC2.
MITSUBISHI
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
6. ASO Curve
Collector current IC (A)
2.0 1.6 1.0 Time of continuity : 50msec
0
To internal circuit 5k NC
0
4
8
12
14
16
20
Voltage between collector and emitter : VCE (V)
7.8V -
VZ
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 Tr2 Tr3 VCC2
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. 10s.
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 150C (125C min.), this function works. When the IC is placed in the all output OPEN mode, and the temperature goes down to 100C (125C 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.

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