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MITSUBISHI M54646AP 2-PHASE STEPPER MOTOR DRIVER DESCRIPTION The M54646AP is a semiconductor IC to drive bipolar stepper motors by controlling winding current with reference to a designated current level. PIN CONFIGURATION (TOP VIEW) FEATURES q Wide driver voltage range (10 - 40V) q Wide output current control range (20 - 800mA) q Bipolar and constant current control q Built-in flywheel diode q Built-in thermal protection circuit Comparator input (1) C1 Comparator reference VR1 voltage input (1) Output stage VMM1 supply voltage (1) Output terminal (1) MA1 Current sensor (1) 1 2 3 4 28 C2 27 VR2 Comparator input (2) Comparator reference voltage input (2) 26 VMM2 Output stage supply voltage (2) 25 MA2 Output terminal (2) 24 E2 23 22 GND 21 20 19 MB2 Output terminal (2) 18 VMM2 Output stage supply voltage (2) 17 VCC2 Power supply (2) One-shot multi 16 T2 time constant 15 Ph2 Output current direction switch Current sensor (2) E1 5 6 M54646AP APPLICATION Office automation equipment such as printers, FDDs, HDDs and facsimiles GND 7 8 9 FUNCTION M54646AP Integrated Circuit drives two-phase bipolar stepper motors while controlling winding current: It controls winding current direction by inputting phases (pins 14 and 15) and, at the same time, controls winding current amperage with terminals VR (pins 2 and 27 ). Provided with control circuits that output two phases, this IC is sufficient to drive a two-phase bipolar stepper motor. Output terminal (1) MB1 10 Output stage VMM1 supply voltage ((1) Power supply (1) VCC1 One-shot multi T1 time constant Output current Ph1 direction switch 11 12 13 14 Outline 28P4B BLOCK DIAGRAM Output stage supply voltage (2) Output stage supply voltage (1) Comparator reference voltage input (2) Comparator reference voltage input (1) Output current direction switch Direction switch output current Output terminal (2) Output terminal (1) MA1 4 VR2 27 Ph2 15 MA2 25 MB2 19 VMM2 18 VR1 2 Ph1 14 VMM1 3 MB1 10 1 Power supply (1) VCC1 12 1 1 1 1 1 Power supply (2) 17 VCC2 1 1 1 1 TSD Monostable tOFF = 0.69 * RT * CT Current sensor 20 21 22 23 28 16 24 6789 1 Monostable tOFF = 0.69 * RT * CT Current sensor 13 5 GND C2 Comparator input (2) T2 One-shot multi time constant E2 Current GND sensor C1 Comparator input (1) T1 One-shot multi time constant (1) E1 Current sensor (1) MITSUBISHI M54646AP 2-PHASE STEPPER MOTOR DRIVER ABSOLUTE MAXIMUM RATINGS (Ta = 25C unless otherwise noted) Symbol VCC VMM VL VC VR IL IC IO Pd Topr Tstg Parameter Supply voltage Output stage supply voltage Logic input voltage Analog input voltage Reference input voltage Logic input current Analog input current Output current Power dissipation Operating temperature Storage temperature Conditions Ratings -0.3 - 7 -0.3 - 45 -0.3 - 6 -0.3 - VCC -0.3 - 15 -10 -10 1000 1.92 -20 - 85 -55 - 125 Unit V V V V V mA mA mA W C C Measured with IC mounted on board RECOMMENDED OPERATIONAL CONDITIONS (Ta = 25C unless otherwise noted) Symbol VCC VMM IO tPLH tPHL TON Parameter Supply voltage Output stage supply voltage Output current Logic input rise time Logic input fall time Thermal shutdown temperature Min. 4.5 10 20 Limits Typ. 5 Max. 5.5 40 800 2 2 Unit V V mA s s C 165 ELECTRICAL CHARACTERISTICS (VCC = 5V, Ta = 25C unless otherwise noted) Symbol VIH VIL ICH ICO IOFF Vsat tOFF td ICC IIH IIL Parameter "H" "L" Comparator threshold voltage Comparator input current Output cutoff current Logic input voltage Total saturation voltage Cutoff time Turn-off delay Power current Logic input current "H" "L" VCC = 5V VR = 5V Test Conditions Min. 2.0 0 400 -20 Limits Typ. Max. VCC 0.8 450 20 100 3.5 25 30 1.6 35 2.0 25 20 Unit V V mA A A V s s mA A mA 430 Sensing resistance is not included. (IO = 500mA) VMM = 10V, tON 5s dVK/dt 50mV/s VCC = 5V, 1 phase VI = 2.4V VI = 0.4V -0.4 MITSUBISHI M54646AP 2-PHASE STEPPER MOTOR DRIVER SWITCHING CHARACTERISTICS SWITCHING WAVEFORM VMA - VMB or VMB - VMA tOFF=0.69 * RT * CT 1 APPLICATION DIRECTIONS (1) Phase input Phase input determines output mode: PHASE H L MA H L MB L H 1/2 tON tOFF (2) VR (reference voltage) Stepless current level variation is available by continuously changing VR. (3) Current sensor Compares voltage converted from amperage by current sensing resistor to designated reference voltage level. When they are the same, comparator triggers Mono-stable, and shuts off output transistor during time frame tOFF. During this period, current level decreases to slightly below reference level. When period has passed, output transistor is reactivated. This series of operations is repeated. (4) Single-pulse generator Mono-stable is triggered at comparator output phase rise edge. Mono-stable output pulse width is determined by input to timing terminals RT and CT, as follows: tOFF = 0.69 x RT x CT If new trigger occurs during tOFF, it is ignored. (5) Analog control Stepless output current level variation is available by continuously changing voltage VR or feedback voltage to comparator. td VE VCH TIMING CHART Two-phase excitation Phase 1 Phase 2 MITSUBISHI M54646AP 2-PHASE STEPPER MOTOR DRIVER AREA OF SAFE OPERATION 1.0 OUTPUT CURRENT Io (A) 0.8 B 0.6 A: Recommended operational range B: External Schottky diode to be connected between output terminal and power terminal as well as between output terminal and GND. V 0.4 A 0.2 B This regulation is for temporary electric power use. For continuous use, be sure power dissipation does not go beyond package's operational range. 0 0 10 20 30 40 45 50 DRIVER VOLTAGE VMM (V) THERMAL DERATING 10.0 POWER DISSIPATION (W) 8.0 6.0 C 4.0 B 2.0 A j-c = 8C/W A: Mounted on 25cm2 glassfiber epoxy resin circuit board with one side copper-foiled c-a = 42C/W B: With aluminum heat sink (1t) 10cm2 c-a = 25C/W C: With aluminum heat sink (1t) 100cm2 c-a = 10C/W Tj(max) = 150C 0 0 25 50 75 100 AMBIENT TEMPERATURE (C) MITSUBISHI M54646AP 2-PHASE STEPPER MOTOR DRIVER APPLICATION EXAMPLE CC1 1 2 3 RC1 4 5 6 MA1 E1 MA2 E2 25 C1 VR1 VMM1 C2 VR2 VMM2 28 27 CC2 24V 26 RC2 47F 24 23 M54646AP RS1 7 GND 8 9 10 11 12 MB1 VMM1 VCC1 T1 Ph1 22 GND 21 20 MB2 VMM2 VCC2 T2 Ph2 19 18 17 RS2 5V CT2 CT1 13 RT1 14 Phase1 15 Phase2 16 RT2 Stepper motor RS1, RS2 = 1 RC1, RC2 = 1k CC1, CC2 = 820F RT1, RT2 = 56k CT1, CT2 = 820F MITSUBISHI M54646AP 2-PHASE STEPPER MOTOR DRIVER CAUTION (1) Be sure to short-circuit VCC1 and VCC2 before use. (2) When IC total output current changes greatly, e.g. when output current flows intermittently due to thermal protection operation, supply voltage may fluctuate. Provide power supply and wiring such that even in such a case amperage will not exceed absolute maximum rating. (3) Excessive power voltage fluctuations may cause unstable IC operation. To regulate such fluctuations, connect capacitor between terminals VCC and GND as close to IC terminal as possible. (Refer to application example.) (4) Thermal protection function * Thermal protection characteristics may differ depending on wiring layout. Be sure to test IC on circuit board before use. After circuit board is replaced, test IC again. * Circuit boards on which this IC mounted are designed such that impedance between power supply and output terminal will be kept low; therefore, IC output terminal may be shortcircuited internally if excessive surge voltage is applied accidentally from outside. To prevent circuit board from burning in such a case, take safety measures such as installation of a fuse. (5) Flywheel diode This IC has built in flywheel diode to provide a return current route to motor. To prevent overheating and malfunction in operational areas where great current and voltage are applied, install a Schottky diode externally. For details, refer to "Area of Safe Operation" and "Application Example." . |
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