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MITSUBISHI
M54677FP
2-PHASE STEPPER MOTOR DRIVER
DESCRIPTION
The M54677FP is a semiconductor IC to drive a bipolar stepper motor directly by controlling the coil current with the constant current method.
PIN CONFIGURATION (TOP VIEW)
St1 C1 Vref1 1 2 3 4 5 6 7 36 35 34 33 32 31 30 St2 C2 Vref2 VM21 MA2 E2
FEATURES
qWide output current control range (20 - 1000mA) qBipolar and constant current qBuilt in a thermal shutdown circuit qBuilt in flywheel diodes
VM11 MA1 E1
M54677FP
8
29 28 27 26 25 24 23 22 21 20 19 N.C MB2 VM22 Vcc2 T2 Ph2 GND
APPLICATION
Office automation equipment such as printer, FDD, HDD, and FAX
9 GND 10 11
FUNCTION
The M54677FP can drive a stepper motor by the 2-phase bipolar method and also control the coil current. Furthermore, it controls the direction of the coil current by Ph input and the coil current value by Vref pin. Because two control circuits are built in this IC, a stepper motor can be driven with a single IC by the 2-phase bipolar method.
12 N.C 13 MB1 14 VM12 15 Vcc1 16 T1 17 Ph1 18
Outline 36P2R-D N.C: no connection
BLOCK DIAGRAM
VM21
VM22
VM11
36
34
19
33
32
23 22
1
3
18
4
5
MA1
14 15
VM12
Vref2
MA2
MB2
Vref1
MB1
Ph2
St2
Ph1
St1
Vcc2
21
16
current -comp +
-
mono-multi
current -comp +
-
mono-multi
-
-
+
Buffer
+ standby -comp 31 E2 7
Buffer
25
-
standby -comp 30 35 C2 20 T2
- 12
GND
2 C1
17 T1
6 E1
GND
Vcc1
MITSUBISHI
M54677FP
2-PHASE STEPPER MOTOR DRIVER
ABSOLUTE MAXIMUM RATINGS (Ta=25C, unless otherwise noted)
Symbol Vcc VM VL Vc Vref IO Pd K Tj Topr Tstg Parameter Supply voltage Output supply voltage Logic input voltage Analog input voltage Comparative input voltage Output current Allowable loss Thermal derating Junction temperature Operating temperature Storage temperature Conditions Pins Pins Pins Pins Pins
16
and
21
4 15 33 1 36 18 2 3
and 32 and 19
and and
35 34
Mounted on a glass epoxy board (100mm x 100mm, t=1.6mm) Mounted on a glass epoxy board (100mm x 100mm, t=1.6mm)
Ratings -0.3 - 7 -0.3 - 28 -0.3 - 6 -0.3 - Vcc -0.3 - Vcc 1500 2.0 62.5 150 -20 - 75 -40 - 125
Unit V V V V V mA W C/W C C C
RECOMMENDED OPERATING CONDITIONS
Symbol Vcc VM Io tPLH tPHL Ton Parameter Small-signal supply voltage Output supply voltage Output current Logic input rise time Logic input fall time Thermal shutdown temperature Min. 4.5 10 Limits Typ. 5.0 500 Max. 5.5 26.5 1000 2 2 Unit V V mA S S C
160
ELECTRICAL CHARACTERISTICS (Ta=25C, Vcc=5V, VM=24V, unless otherwise noted)
Symbol VIH VIL VIH VIL VCH IC VC Iref Vref IOFF Vsat tOFF td Icc1 Icc2 IIH IIL IIH IIL Parameter Logic input voltage (St pin) Logic input voltage (Ph pin) Comparator input offset voltage Comparator input current Comparator input voltage range Vref input current Vref input voltage range Output cutoff current Saturation voltage Cutoff time Output turnoff delay Supply current Logic input current (St pin) Logic input current (Ph pin) "H" "L" "H" "L" "H" "L" "H" "L" Vcc=5V Vcc=5V Vref = 500mV C pin input current (C=0V, Vref=500mV) Vref pin input current (Vref=0V, C=500mV) Test conditions Min. 2.0 0 2.0 0 -4 -20 0 -20 0 Limits Typ. Max. Vcc 0.6 Vcc 0.8 8 1.5 -5 1.5 100 1.8 50 2.0 40 39 10 10 -200 Unit V V V V mV A V A V A V S S mA mA A A A A
2 -5
Voltage at sensing resistor is not included. Io=0.5A 5 Pin 16 current (16Pin=5V) Pin 21 current (21Pin=5V) Vin = 5V Vin = 0V Vin = 5V Vin = 0V
1.3 27 1.6 27 26
-200
MITSUBISHI
M54677FP
2-PHASE STEPPER MOTOR DRIVER
SWITCHING CHARACTERISTICS Switching waveforms
VMA - VMB or VMB - VMA
APPLICATION DESCRIPTION
(1) Phase input Phase input decides the output mode.
1
TOFF=0.69 x RT x CT
TON 1/2
TOFF
Ph H L H L
St L L H H
MA H L Z Z
MB L H Z Z
Z: High impedance (2) Vref (Comparative voltage) The current level can be continuously changed by changing Vref voltage continuously.
VE VCH
td
(3) Current sensor When the voltage fall at the current sensing resistor and the selected current level become of the same level, the comparator triggers the monostable. Then the output stage is cut off for a certain time (TOFF). During this cutoff time, the current decreases slightly and falls short of the comparative level. After the cutoff time (TOFF), the output stage is in ON state again. This operation is repeated. (4) Single pulse generator At the comparator output fall edge, the monostable is triggered. The pulse width of the monostable at the external timing CT and RT is as follows. TOFF = 0.69 x CT x RT Retrigger during TOFF is neglected. (5) Analog control The output current level can be continuously changed by changing the voltage at VR or the feedback voltage to the comparator.
TIMING CHART
2-phase excitation
Phase 1
Phase 2
MITSUBISHI
M54677FP
2-PHASE STEPPER MOTOR DRIVER
TYPICAL CHARACTERISTICS
Thermal derating Allowable power dissipation (W)
Infinite heat sink
5.0 4.5 4.0 3.0 2.0 1.2 1.0
Mounted on a board (*1)
IC Free air
50 75 100 125 150 25 Ambient temperature Ta (C) (*1) : 100mm x 100mm, t=1.6mm Mounted on a board with copper coating (35m) 0
APPLICATION EXAMPLE
STEPPER MOTOR M
1 2 Cc1 24V Rc1 Power GND Rs1 3 4 5 6 7
St1 C1 Vref1 VM11 MA1 E1
St2 C2 Vref2 VM21 MA2 E2
36 35 34 33 32 31 30 Rs2 Rc2 Power GND Cc2 24V
M54677FP
8 9 10 11 R2 12 13 R1 14 15 5V Rt1 Ct1 16 17 18 N.C MB1 VM12 Vcc1 T1 Ph1 GND
29 28 GND 27 26 25 N.C MB2 VM22 Vcc2 T2 Ph2 24 23 22 21 20 19 Rt2 Ct2 5V R1 R2 R1 = 4.7K R2 = 330 Rs1, Rs2 = 0.5 Rc1, Rc2 = 1.0k Cc1, Cc2 = 820pF Rt1, Rt2 = 47k Ct1, Ct2 = 330pF Setting example
MITSUBISHI
M54677FP
2-PHASE STEPPER MOTOR DRIVER
PRECAUTIONS FOR USE
(1) Before use, never forget to short-circuit Vcc1 and Vcc2. (2) When the whole output current changes by a large margin (for example, when thermal shutdown operation causes intermittent flow of output current), the supply voltage may undergo a change. Therefore, selection and wiring of power supply should be conducted cautiously to avoid such a situation that the supply voltage exceeds the absolute maximum ratings. (3) When the supply voltage changes by a large margin, the operation of this IC may become unstable. In this case, the change of supply voltage can be controlled by connecting a capacitor between Vcc pin and GND pin. (4) Thermal shutdown function The state of thermal shutdown operation may differ according to the way of wiring within a board. Therefore, sufficient board evaluation should be conducted before use. When the board is changed, operation on the replacing board should be evaluated. The circuit board on which this IC is mounted is designed to realize low impedance between power supply and output pin. Therefore, it is desirable to take a safe measure such as fixing a fuse to avoid such a situation that the board is damaged by a fire when output pin is internally short-circuited by excessive surge voltage applied externally by accident.

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