M54670P 2-Phase Stepper Motor Driver REJ03F0045-0100Z Rev.1.0 Sep.19.2003 Description The M54670P is a semiconductor IC to drive a bipolar stepper motor directly by controlling the coil current with the constant current method. Features • • • • • • Wide operating voltage range (10 – 35V) Wide output current control range (20 – 800mA) Bipolar and constant current drive Built in flywheel Current level can be changed by steps or continuously. Built in a thermal shutdown circuit Application Office automation equipment such as printer, FDD, HDD, and FAX Function 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. Rev.1.0, Sep.19.2003, page 1 of 10 M54670P Pin Configuration Triangular wave CT 1 32 VCC Comparator reference input(A) VR(A) 2 Output current direction switching(A) Ph(A) 3 Output power supply(A) VMM1(A) 4 Output(A) Comparator reference input(B) Output current 30 Ph(B) direction switching(B) Output power 29 VMM1(B) supply(B) O1(A) 5 6 27 7 26 8 9 10 Current sensor(A) E(A) 11 Output(A) O2(A) 12 Output power supply(A) VMM2(A) Output current I0(A) value setting(A) Output current I1(A) value setting(A) Comparator C(A) input(A) 28 O1(B) Output(B) M54670P GND 25 GND 24 23 22 E(B) Current sensor(B) 21 O2(B) Output(B) Output power 13 20 VMM2(B) supply(B) 14 19 I0(B) 15 18 I1(B) 16 17 C(B) Outline 32P4B Rev.1.0, Sep.19.2003, page 2 of 10 Circuit power supply 31 VR(B) Output current value setting(B) Output current value setting(B) Comparator input(B) M54670P Ph(A) Output current direction switching(A) VMM1(A) Output power supply(A) O1(A) Output(A) O2(A) Output(A) VMM2(A) Output power supply(A) VMM1(B) Output power supply(B) O1(B) Output(B) O2(B) Output(B) VMM2(B) Output power supply(B) Ph(B) Output current direction switching(B) VR(B) Comparator input(B) 32 3 4 5 12 13 29 28 21 20 30 31 Output current value setting(A) I0(A) 14 Output current value 15 setting(A) I1(A) Control circuit VCC Circuit power supply 2 Control circuit VR(A) Comparator reference input(A) Block Diagram Output current value setting(B) 19 I0(B) 18 Output current value TSD 00 10 01 11 11 01 10 6 23 10 – – GND setting(B) I1(B) 00 Power supply sensor 16 C(A) Comparator input(A) Triangular wave 1 CT Triangular wave Power supply sensor 11 E(A) 22 GND 27 17 E(B) Current sensor(B) C(B) Comparator input(B) Current sensor(A) Absolute Maximum Ratings (Ta = 25°C, unless otherwise noted.) Parameter Symbol Ratings Unit Supply voltage VCC −0.3 to 7 V Output supply voltage Logic input voltage VMM VL −0.3 to 40 −0.3 to 6 V V Comparator input voltage Reference input voltage VC VR Vcc 7 V V Output current Allowable power dissipation IO Pd ±1.0 1.92 A W Operating temperature Storage temperature Topr Tstg −20 to 75 −55 to 125 °C °C Rev.1.0, Sep.19.2003, page 3 of 10 Conditions Mounted on a board M54670P Recommended Operating Condition (Ta = 25°C, VCC = 5.0V, unless otherwise noted.) Limits Parameter Symbol Min. Typ. Max. Unit Supply voltage Output supply voltage VCC VMM 4.75 10 5.00 5.25 35 V V Reference input voltage Output current IR IO 0 20 800 800 V mA Logic input rise time Logic input fall time tPLH tPHL 2.0 2.0 µS µS Thermal shutdown temperature* TON 175 °C Note * : Refer to "PRECAUTIONS FOR USE." Electrical characteristics (Ta = 25°C, VCC = 5.0V, VMM = 10V, unless otherwise noted.) Limits Parameter Symbol Min. VIH VIL 2.0 0 VCH VCM 430 265 Comparator input current VCL ICO 90 −20 Output cutoff current Saturation voltage IOFF Vsat PWM oscillator frequency Turnoff delay fc td Supply current Logic input current “H” “L” Logic input voltage “H” “L” Comparator threshold Max. Unit Test conditions Vcc 0.8 V VCC=5V 460 285 480 305 mV VR=5V, I0=I1=0 VR=5V, I0=1,I1=0 110 −2 130 20 µA 0 3.0 100 4.5 µA V 33 1.0 66 2.0 KHz µS VMM=10V, Cf = 3900pF Ta=25°C, dVK/dt ≥ 50mV/µs ICC IIH 8.0 180 25 400 mA µA VCC=5V VI=2.4V IIL 20 50 µA VI=0.4V 16.5 Typ. VR=5V, I0=0, I1=1 I0=I1=1(Ta=25°C) Voltage at sensing resistor is not included. IO=500mA Application Description (1) PHASE INPUT Phase input decides the output mode. Phase O1 O2 H L H L H L Rev.1.0, Sep.19.2003, page 4 of 10 M54670P (2) I0, I1 I0 and I1 fixed based on the comparative voltage VR decide the output current level. I0 I1 Current level H H 0 L H Low H L L L Typ High (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 Cf is externally connected to CT pin in order to fix the PWM oscillator frequency. The frequency fc is calculated as follows. fc = 1 7.77 x 103 x Cf (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.” Rev.1.0, Sep.19.2003, page 5 of 10 M54670P Timing 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) Rev.1.0, Sep.19.2003, page 6 of 10 M54670P Typical Characteristics (Absolute maximum ratings) Safety operating range 1.0 A : Recommended Output current IO (A) 0.8 B : Schottky diodes should be externally connected between output pin and power supply pin. B 0.6 C : Schottky diodes should be externally connected between output pin and power supply pin and between output pin and GND pin. 0.4 A 0.2 0 10 0 C 20 30 50 35 40 Output VMM (V) Thermal derating θj-c = 20°C/W C Allowable power dissipation (W) 4.0 A : Free air (θc-a = 50°C/W) B : With 10cm2 aluminum heat (θc-a = 25°C/W) 3.0 B C : With 100cm2 aluminum heat (θc-a = 10°C/W) 2.0 A Tj(max) = 150°C 1.0 0 0 10 20 30 40 50 Ambient (°C) Rev.1.0, Sep.19.2003, page 7 of 10 60 70 80 M54670P Application Example (Stepping motor driver) VR 1 CT VCC 32 2 VR(A) VR(B) 31 3 Ph(A) Ph(B) 30 4 VMM1(A) VMM1(B) 29 5 O1(A) O1(B) 28 VCC Cf Phase A 6 27 7 26 GND 9 M54670P 8 GND 25 23 E(A) E(B) 22 RS RS RC IN(A) 12 O2(A) O2(B) 21 13 VMM2(A) VMM2(B) 20 14 I0(A) I0(B) 19 15 I1(A) I1(B) 18 RC IN(B) CC CC 16 C(A) C(B) 17 Cf = 3900pF RS = 0.51Ω RC = 1kΩ CC = 820pF Stepper motor (3.7mH / 6Ω / phase) Rev.1.0, Sep.19.2003, page 8 of 10 VMM 40µF/50V 0.01 µF 24 10 11 Phase B M54670P Precautions for use (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. Rev.1.0, Sep.19.2003, page 9 of 10 SEATING PLANE e D b1 b 16 Lead Material Alloy 42/Cu Alloy 1 Weight(g) 2.2 17 JEDEC Code — MMP 32 EIAJ Package Code SDIP32-P-400-1.78 A L Rev.1.0, Sep.19.2003, page 10 of 10 b2 A2 A1 A A1 A2 b b1 b2 c D E e e1 L Symbol Plastic 32pin 400mil SDIP c Dimension in Millimeters Min Nom Max — — 5.08 0.51 — — — 3.8 — 0.35 0.45 0.55 0.9 1.0 1.3 0.63 0.73 1.03 0.22 0.27 0.34 27.8 28.0 28.2 8.75 8.9 9.05 — 1.778 — — 10.16 — 3.0 — — 0˚ — 15˚ e1 32P4B M54670P Package Dimensions E Sales Strategic Planning Div. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Keep safety first in your circuit designs! 1. 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