M54670P

M54670P MITSUBISHI | Alldatasheet

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2-PHASE STEPPER MOTOR DRIVER M 54670P MITSUBISHI <CONTROL / DRIVER IC> DES CRIPT IO N The M54670P is a semiconductor IC to drive a bipolar stepper motor directly by controlling the coil current with the constant current method. FEAT URES l Wide operating voltage range (10 – 35V) l Wide output current control range (20 – 800mA) l Bipolar and constant current drive l Built in flywheel l Current level can be changed by steps or continuously. l Built in a thermal shutdown circuit APP LICAT IO N Office automation equipment such as printer, FDD, HDD, and FAX FUNCT IO N The M54670P 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 with Ph input pins (pins 3 and 30). The coil current value can be selected among four levels (0 to max.) by selecting the combination of three internal comparators by logic input (pins 14, 15, 18 and 19). It also can be continuously controlled with VR pins (pins 2 and 31). By selecting an I input pin among pins 14, 15, 18 or 19, the operation timing, 2-phase excitation, 1-2-phase excitation or microstep, can be selected. 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. B LOC K D IAGR A M 2 32 3 4 5 12 13 29 28 21 20 30 31 C(B) E(B) E(A) CT C(A) 00 10 01 11 11 01 10 00 GND Comparator input(A) Triangular wave Current sensor(A) Current sensor(B) Comparator input(B) Power supply sensor Triangular wave GND Output current value I0(A) I1(A) setting(B) I0(B) Control circuit Control circuit TSD Power supply sensor VR (A) Comparator reference input(A) VCC Circuit power supply Ph(A) Output current direction switching(A) VMM 1(A) Output power supply(A) O 2(A) Output(A) VMM 2(A) Output power supply(A) VMM 1(B) Output power supply(B) O 1(B) Output(B) O 2(B) Output(B) VMM 2(B) Output power supply(B) VR (B) Comparator input(B) Ph(B) Output current direction switching(B) setting(A) Output current value setting(A) Output current value setting(B) I1(B) Output current value O 1(A) Output(A) Outline 32P4B CT VR (A) Ph(A) VMM 1(A) O1(A) GND E(A) O2(A) VMM 2(A) I0(A) I1(A) C(A) VCC VR (B) Ph(B) VMM 1(B) O1(B) GND E(B) O2(B) VMM 2(B) I0(B) I1(B) C(B) Triangular wave Comparator reference input(A) Output current direction switching(A) Output power supply(A) Output(A) Current sensor(A) Output(A) Output power supply(A) Output current value setting(A) Output current value setting(A) Comparator input(A) Circuit power supply Comparator reference input(B) Output current direction switching(B) Output power supply(B) Output(B) Current sensor(B) Output(B) Output power supply(B) Output current value setting(B) Output current value setting(B) Comparator input(B) M54670P PIN C O N FIG URAT IO N (TO P VIEW )

2-PHASE STEPPER MOTOR DRIVER M 54670P MITSUBISHI <CONTROL / DRIVER IC> ABS O LUT E M AXIM UM RAT ING S (Ta=25°C, unless otherwise noted) Symbol Ratings UnitParameter Conditions VCC Supply voltage Mounted on a board -0.3 – 7 -0.3 – 40 -0.3 – 6 VCC –1.0 1.92 -20 – 75 -55 – 125 V V V V V A W REC O M M ENDE D O PERAT IN G C O NDITIO N S (VCC =5.0V, Ta=25°C, unless otherwise noted) Symbol Parameter Limits Min. Typ. Max. Unit VCC Supply voltage Output supply voltage Output current Logic input rise time Logic input fall time Thermal shutdown temperature * 4.75 5.00 5.25 800 2.0 V V ms EL ECT R ICAL CHARACT ERISTICS (VCC =5.0V, VMM =10V, Ta=25°C, unless otherwise noted) Limits Min. Typ. Max.Symbol Test conditions UnitParameter VIH VIL VCH VCM VCL ICO IOFF Vsat Logic input voltage Comparator threshold Comparator input current Output cutoff current Saturation voltage “H” “L” VCC =5V VR =5V, I0=I1=0 VR =5V, I0=1, I1=0 VR =5V, I0=0, I1=1 I0=I1=1(Ta=25°C) 2.0 430 265 -20 460 285 110 VCC 0.8 480 305 130 100 mV mA mA mA Reference input voltage * : Refer to "PRECAUTIONS FOR USE." 175 2.0 ms mA V mV V VMM VR IO tPLH tPHL TON VMM VI VC VR IO Pd Topr Tstg Output supply voltage Logic circuit input voltage Comparator input voltage Reference input voltage Output current Allowable power dissipation Operatingtemperature Storage temperature mV Voltage at sensing resistor is not included. I0=500mA IIL IIH ICC td fc Logic input current Supply current Turn-off delay PWM oscillator frequency “L” “H” VI=0.4V VI=2.4V VCC =5V Ta=25°C, dV/dt‡50mV/ms VMM =10V, Cf=3900pF 16.5 180 8.0 1.0 400 2.0 mA mA ms kHz — 3.0 4.5 V

2-PHASE STEPPER MOTOR DRIVER M 54670P MITSUBISHI <CONTROL / DRIVER IC> H L H L H Current level H L L Low Typ High (2) I0, I1 I0 and I1 fixed based on the comparative voltage VR decide the output current level. PHASE H L L H H L (3) VR (Comparative voltage) The current level can be continuously changed by changing the voltage at VR continuously. (4) Current sensor When the voltage fall at the current sensing resistor and the selected current level become of the same level, the output state is cut off for a certain time by inverting the comparator. During this cutoff time, the current volume decreases slightly due to the L component of the motor and falls short of the comparative level. During the time fixed based on the PWM frequency, the output stage goes in ON state and then in OFF state and this ON/OFF operation is repeated. (5) PWM oscillator A capacitor C fis externally connected to C T pin in order to fix the PWM oscillator frequency. The frequency fc is calculated as follows. (6) Analog control The output current level can be continuously changed by changing the voltage at VR or the feedback voltage to the comparator. (7) Thermal shutdown function This IC has a function to protect itself against thermal damage which is caused when the chip temperature rises abnormally. Regarding this function, refer to “PRECAUTIONS FOR USE.” fc = 7.77 x103 xC f TIM ING CHART 2-phase excitation Phase 1 Phase 2 I0, 1(A) = 0 I0, 1(B) = 0 1-2-phase excitation Phase 1 Phase 2 I0, 1(A) I0, 1(B) Microstep Phase 1 Phase 2 I0(A) I1(A) I0(B) I1(B) APP LICAT IO N DES CRIPT IO N (1) PHASE INPUT Phase input decides the output mode.

2-PHASE STEPPER MOTOR DRIVER M 54670P MITSUBISHI <CONTROL / DRIVER IC> TYPICAL CHARACT ERISTICS (ABSOLUTE MAXIMUM RATINGS) 1.0 0.6 Output current IO (A) 10 50 Output V MM (V) 20 30 40 0.2 0.4 0.8 A : B : C : Recommended Schottky diodes should be externally connected between output pin and power supply pin. Schottky diodes should be externally connected between output pin and power supply pin and between output pin and GND pin. Safety operating range 2.0 Allowable power dissipation (W) Ambient ( 1.0 3.0 A : Free air q c-a = 50 C/W) B : With 10cm aluminum heat q c-a = 25 C/W) C : With 100cm aluminum heat q c-a = 10 C/W) Thermal derating 10 20 30 40 50 60 70 4.0 A B C q j-c = 20 ° C/W T j(max) = 150 C B AC

2-PHASE STEPPER MOTOR DRIVER M 54670P MITSUBISHI <CONTROL / DRIVER IC> APP LICAT IO N EXA M PLE (Stepping motor driver) C T V R (A) P h (A) V MM 1(A) O 1(A) GND O 2(A) V MM 2(A) I0(A) I1(A) C(A) V CC V R (B) P h (B) V MM 1(B) O 1(B) GND O 2(B) V MM 2(B) I0(B) I1(B) C(B) C C R C R S R C Phase A Phase B V MM V CC V R IN(B) m F/50V C C IN(A) E(A) E(B) R S C f M54670P 0.01 m F C f = 3900pF R S = 0.51 W R C = 1k W C C = 820pF Stepper motor (3.7mH / 6 W / phase)

2-PHASE STEPPER MOTOR DRIVER M 54670P MITSUBISHI <CONTROL / DRIVER IC> PRE CAUT IO N S FO R U SE (1)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. (2)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. (3)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 excessively applied surge voltage by accident.