MITSUBISHI <CONTROL / DRIVER IC> M54677FP 2-PHASE STEPPER MOTOR DRIVER DESCRIPTION PIN CONFIGURATION (TOP VIEW) The M54677FP is a semiconductor IC to drive a bipolar stepper motor directly by controlling the coil current with the constant St1 1 36 St2 C1 2 35 C2 Vref1 3 34 Vref2 VM11 4 33 VM21 MA1 5 32 MA2 E1 6 31 E2 7 30 current method. FEATURES ●Wide output current control range (20 – 1000mA) ●Bipolar and constant current ●Built in a thermal shutdown circuit M54677FP ●Built in flywheel diodes 8 9 APPLICATION GND 10 Office automation equipment such as printer, FDD, HDD, and FAX 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 28 GND 27 11 26 12 25 N.C 13 24 N.C MB1 14 23 MB2 VM12 15 22 VM22 Vcc1 16 21 Vcc2 T1 17 20 T2 Ph1 18 19 Ph2 FUNCTION The M54677FP can drive a stepper motor by the 2-phase bipolar 29 can be driven with a single IC by the 2-phase bipolar method. Outline 36P2R-D N.C: no connection 18 5 VM12 4 MB1 3 MA1 1 VM11 23 22 Ph1 MA2 32 Vref1 VM21 33 St1 Ph2 19 VM22 Vref2 34 MB2 St2 36 14 15 21 16 current -comp current -comp mono-multi + – – – – + 25 – GND + Buffer standby -comp 30 mono-multi + Buffer standby -comp 35 20 31 C2 T2 E2 7 – 12 GND 2 17 6 C1 T1 E1 Vcc1 Vcc2 BLOCK DIAGRAM MITSUBISHI <CONTROL / DRIVER IC> M54677FP 2-PHASE STEPPER MOTOR DRIVER ABSOLUTE MAXIMUM RATINGS (Ta=25˚C, unless otherwise noted) Symbol Vcc VM VL Vc Vref IO Pd Kθ 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 4 15 33 1 36 18 2 3 and and Unit V V V V V mA W 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 21 and 32 and 19 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) ˚C/W ˚C ˚C ˚C RECOMMENDED OPERATING CONDITIONS Symbol Vcc VM Io tPLH tPHL Ton Parameter Min. 4.5 10 Small-signal supply voltage Output supply voltage Output current Logic input rise time Logic input fall time Thermal shutdown temperature Limits Typ. 5.0 500 Max. 5.5 26.5 1000 2 2 160 Unit V V mA µS µS ˚C ELECTRICAL CHARACTERISTICS (Ta=25˚C, 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) Test conditions “H” “L” “H” “L” Vref pin input current (Vref=0V, C=500mV) Voltage at sensing resistor is not included. Io=0.5A 5 Supply current Logic input current (Ph pin) Vcc=5V Vref = 500mV C pin input current (C=0V, Vref=500mV) 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 Logic input current (St pin) Vcc=5V Min. 2.0 0 2.0 0 -4 -20 0 -20 0 “H” “L” “H” “L” Pin 16 current (16Pin=5V) Pin 21 current (21Pin=5V) Vin = 5V Vin = 0V Vin = 5V Vin = 0V Limits Typ. 2 -5 Max. Vcc 0.6 Vcc 0.8 8 1.5 -5 1.3 27 1.6 27 26 1.5 100 1.8 50 2.0 40 39 10 -200 10 -200 Unit V V V V mV µA V µA V µA V µS µS mA mA µA µA µA µA MITSUBISHI <CONTROL / DRIVER IC> M54677FP 2-PHASE STEPPER MOTOR DRIVER APPLICATION DESCRIPTION SWITCHING CHARACTERISTICS Switching waveforms (1) Phase input Phase input decides the output mode. VMA - VMB or VMB - VMA TOFF=0.69 x RT x CT 1 TON TOFF 1/2 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 TIMING CHART 2-phase excitation Phase 1 Phase 2 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. MITSUBISHI <CONTROL / DRIVER IC> M54677FP 2-PHASE STEPPER MOTOR DRIVER TYPICAL CHARACTERISTICS Allowable power dissipation (W) Thermal derating Infinite heat sink 5.0 4.5 4.0 Mounted on a board (*1) 3.0 IC Free air 2.0 1.2 1.0 50 75 100 125 150 25 Ambient temperature Ta (˚C) (*1) : 100mm x 100mm, t=1.6mm Mounted on a board with copper coating (35µm) 0 APPLICATION EXAMPLE STEPPER MOTOR Cc1 24V Rc1 Power GND Rs1 M 1 St1 St2 36 2 C1 C2 35 3 Vref1 Vref2 34 4 VM11 VM21 33 5 MA1 MA2 32 6 E1 E2 31 9 GND 11 M54677FP 8 R1 5V Rt1 Ct1 Rs2 28 GND Setting example 27 26 25 13 N.C Power GND 29 12 R2 24V Rc2 30 7 10 Cc2 N.C 24 14 MB1 MB2 23 15 VM12 VM22 22 16 Vcc1 Vcc2 21 17 T1 T2 20 18 Ph1 Ph2 19 R2 R1 5V Rt2 Ct2 R1 = 4.7KΩ R2 = 330Ω Rs1, Rs2 = 0.5Ω Rc1, Rc2 = 1.0kΩ Cc1, Cc2 = 820pF Rt1, Rt2 = 47kΩ Ct1, Ct2 = 330pF MITSUBISHI <CONTROL / DRIVER IC> 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.