 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| MITSUBISHI M54671SP 2-PHASE STEPPER MOTOR DRIVER DESCRIPTION The M54671SP 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) Standby input(1) Comparator input(1) St1 1 C1 2 32 St2 31 C2 30 VR2 Standby input(2) Comparator input(2) FEATURES q Wide output current control range (20 - 1200mA) q Bipolar and constant current q Built in a thermal shutdown circuit Comparator VR1 3 reference input(1) Bootstrap power Vbs1 4 supply(1) Output power VMM1 5 supply(1) Output(1) Current sensor(1) MA1 6 E1 7 Comparator reference input(2) Bootstrap power 29 Vbs2 supply(2) Output power 28 VMM2 supply(2) 27 MA2 26 E2 25 24 23 22 MB2 Output(2) Current sensor(2) M54671SP APPLICATION Office automation equipment such as printer, FDD, HDD, and FAX GND 8 9 10 GND FUNCTION The M54671SP 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 16 and 17) and the coil current value with VR pins (pins 3 and 30). Because two control circuits are built in this IC, a stepping motor can be driven with a single IC by the 2-phase bipolar method. Output(1) MB1 11 Output(2) Output power Output power supply(1) VMM1 12 Bootstrap power Vbs1 13 supply(1) Power supply(1) Vcc1 14 One-shot-multi time constant(1) Output current direction switching(1) T1 15 Ph1 16 21 VMM2 supply(2) 20 Vbs2 Bootstrap power supply(2) 19 Vcc2 Power supply(2) 18 T2 17 Ph2 One-shot-multi time constant(2) Output current direction switching(2) Outline 32P4B BLOCK DIAGRAM VR2 Comparator reference input(2) VR1 Comparator reference input(1) Vbs2 Bootstrap power supply(2) Vbs1 Bootstrap power supply(1) Vbs2 Bootstrap power supply(2) VMM2 Output power supply(2) 32 VCC2 Power supply(2) 30 17 29 28 27 22 21 20 1 3 16 4 5 6 11 VMM1 Output power supply(1) 12 MB2 Output(2) MB1 Output(1) Vbs1 Bootstrap power supply(1) 13 VCC1 Power supply(1) VMM2 Output power supply(2) MA2 Output(2) VMM1 Output power supply(1) Ph2 Output current direction switching(2) St2 Standby input(2) St1 Standby input(1) Ph1 Output current direction switching(1) 19 MA1 Output(1) 14 Voltage sensor Monostable Voltage sensor Monostable Standby circuit comparator Standby circuit comparator 25 24 23 GND 31 C2 Comparator input(2) 26 E2 Current sensor(2) One-shot-multi time constant(2) 18 T2 8 9 10 GND 2 C1 Comparator input(1) 7 E1 Current sensor(1) One-shot-multi time constant(1) 15 T1 MITSUBISHI M54671SP 2-PHASE STEPPER MOTOR DRIVER ABSOLUTE MAXIMUM RATINGS (Ta=25C, unless otherwise noted) Symbol VCC VMM Vbs VL VC VR IL IC IMM Pd Topr Tstg Parameter Supply voltage Output supply voltage Bootstrap supply voltage Logic input voltage Analog input voltage Comparative input voltage Logic input current Analog input current Output supply current Allowable loss Operating temperature Storage temperature Conditions Ratings -0.3 - 7 -0.3 - 24 -0.3 - 27 -0.3 - 6 -0.3 - VCC -0.3 - 15 -10 -10 1500 1.70 -20 - 75 -55 - 125 Unit V V V V V V mA mA mA W C C RECOMMENDED OPERATING CONDITIONS (Ta=25C, unless otherwise noted) Symbol VCC VMM Vbs IO tPLH tPHL TON Parameter Supply voltage Output supply voltage Bootstrap supply voltage Output current Logic input rise time Logic input fall time Thermal shutdown Min. Limits Typ. Max. 5.5 20 24 1200 2 2 Unit V V V mA s s C 4.5 5 10 12 Vbs VMM+1V 800 20 160 ELECTRICAL CHARACTERISTICS (Ta=25C, unless otherwise noted) Symbol VIH VIL VCH ICO IOFF Vsat tOFF td ICC IIH IIL Parameter Logic input voltage Comparator threshold Comparator input current Output cutoff current Saturation voltage Cutoff time Turn-off delay Supply current Logic input current "H" "L" "H" "L" VCC=5V VR=5V Test conditions Min. 2.0 0 420 -20 Limits Typ. Max. VCC 0.8 480 20 100 1.5 15 2.0 25 100 Unit V V mV A A V s s mA A mA 450 Voltage at sensing resistor is not included. Vbs=12.7V, VMM=12V, IO=800mA VMM=12V, tON 5s dVK/dt 50mV/s VCC=5V, 1phase VI=2.4V VI=0.4V 5 1.0 10 1.6 -0.4 MITSUBISHI M54671SP 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. PHASE H L MA H L MB L H 1 TOFF = 0.69 x RT x CT (2) VR (Comparative voltage) 1/2 TON TOFF The current level can be continuously changed by changing the voltage at VR continuously. (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 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 rise 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. VE VCH td TIMING CHART (5) Analog control The output current level can be continuously changed by 2-phase excitation changing the voltage at VR or the feedback voltage to the comparator. Phase 1 Phase 2 TYPICAL CHARACTERISTICS Thermal j-c = 25C/W Allowable power dissipation (W) 3 2.5W 2 10cm2 aluminum heat sink (c-a = 25C/W) 1.7W 1 Free air (c-a = 48.5C/W) 0 10 20 30 40 50 60 70 80 Ambient Temperature Ta (C) MITSUBISHI M54671SP 2-PHASE STEPPER MOTOR DRIVER APPLICATION EXAMPLE (Stepping motor driver) VBS 13V VMM 12V 47 F 1 CC1 2 3 RC1 4 5 6 7 8 RS1 9 10 11 12 13 14 CT1 15 16 RT1 Phase 1 Phase 2 T1 Ph1 T2 Ph2 18 17 RT2 MB1 VMM1 Vbs1 VCC1 MB2 VMM2 Vbs2 VCC2 GND Vbs1 VMM1 MA1 E1 Vbs2 VMM2 MA2 E2 29 28 27 26 25 RS2 GND 24 23 22 21 20 19 CT2 VCC 5V C1 VR1 C2 VR2 31 30 RC2 St1 St2 32 CC2 Stepper motor (3.7mH / 6 / phase) M54671SP RS1, RC1, CC1, RT1, CT1, RS2 = 0.5 RC2 = 1k CC2 = 820pF RT2 = 47k CT2 = 330pF MITSUBISHI M54671SP 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 excessively applied surge voltage by accident. (5) Flywheel Flywheel diode is not built in this IC. Before use, connect a flywheel diode between each output (MA1, MB1, MA2, and MB2) and output power supply (VMM). (Refer to APPLICATION EXAMPLE.) |
Price & Availability of M54671SP
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |