M54646AP 2-Phase Stepper Motor Driver REJ03F0044-0100Z Rev.1.0 Sep.19.2003 Description The M54646AP is a semiconductor IC to drive bipolar stepper motors by controlling winding current with reference to a designated current level. Features • • • • • Wide driver voltage range (10 – 40V) Wide output current control range (20 – 800mA) Bipolar and constant current control Built-in flywheel diode Built-in thermal protection circuit Application Office automation equipment such as printers, FDDs, HDDs and facsimiles 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. Pin Configuration Comparator input (1) C1 → Comparator reference VR1 → voltage input (1) Output stage VMM1 supply voltage (1) Output terminal (1) MA1 ← Current sensor (1) 1 28 ← C2 2 27 ← VR2 4 24 → E2 E1 ← 5 8 9 MB1 ← 10 Output stage VMM1 supply voltage (1) Power supply (1) VCC1 One-shot multi ← T1 → time constant Output current Ph1 → direction switch M54646AP 7 GND Output terminal (1) Comparator reference voltage input (2) 26 VMM2 Output stage supply voltage (2) 25 → MA2 Output terminal (2) 3 6 22 GND 21 20 19 → MB2 Output terminal (2) VMM2 Output stage supply voltage (2) VCC2 Power supply (2) 18 12 17 13 16 ← → T2 One-shot multi time constant 15 ← Ph2 Output current direction switch Outline 28P4B Rev.1.0, Sep.19.2003, page 1 of 8 Current sensor (2) 23 11 14 Comparator input (2) M54646AP Direction switch output current Output stage supply voltage (1) MA2 MB2 VMM2 VR1 Ph1 VMM1 MA1 MB1 15 25 19 18 2 14 3 4 10 Output terminal (2) 1 1 1 Output terminal (1) Comparator reference voltage input (1) Ph2 27 Output current direction switch VR2 Comparator reference voltage input (2) Output stage supply voltage (2) Block Diagram 1 1 1 Power supply (1) VCC1 12 Power supply (2) 17 VCC2 1 1 1 1 TSD Monostable Monostable tOFF = 0.69 • RT • CT Current sensor 20 21 22 23 28 GND C2 Comparator input (2) tOFF = 0.69 • RT • CT Current sensor 16 24 6 7 8 9 T2 One-shot multi time constant E2 Current GND sensor Symbol Ratings 1 13 C1 Comparator input (1) T1 One-shot multi time constant (1) 5 E1 Current sensor (1) Absolute Maximum Ratings (Ta = 25°C, unless otherwise noted.) Parameter Unit Supply voltage VCC −0.3 to 7 V Output stage supply voltage Logic input voltage VMM VL −0.3 to 45 −0.3 to 6 V V Analog input voltage Reference input voltage VC VR −0.3 to Vcc −0.3 to 15 V V Logic input current Analog input current IL IC −10 −10 mA mA Output current Power dissipation IO Pd ±1000 1.92 mA W Operating temperature Storage temperature Topr Tstg −20 to 85 −55 to 125 °C °C Rev.1.0, Sep.19.2003, page 2 of 8 Conditions M54646AP Recommended Operating Condition (Ta = 25°C, unless otherwise noted.) Limits Parameter Symbol Min. Typ. Max. Unit Supply voltage Output supply voltage VCC VMM 4.5 10 5 5.5 40 V V Output current Logic input rise time IO tPLH 20 800 2 mA µS Logic input fall time Thermal shutdown temperature tPHL TON 2 µS °C 165 Electrical characteristics (Ta = 25°C, VCC = 5.0V, unless otherwise noted.) Limits Parameter Logic input voltage Min. Typ. Max. Unit Test conditions 430 VIH 2.0 Vcc V VCC=5V “L” Comparator threshold voltage VIL VCH 0 400 0.8 450 mV VR=5V Comparator input current Output cutoff current ICO IOFF −20 20 100 µA µA Total saturation voltage Vsat 3.5 V Cutoff time tOFF 30 35 µS Sensing resistance is not included. (IO=500mA) VMM=10V, tON ≥ 5µs Turnoff delay Power current td ICC 1.6 2.0 25 µS mA dVK/dt ≥ 50mV/µs VCC=5V, 1phase 20 µA mA VI=2.4V VI=0.4V Logic input current “H” Symbol “H” “L” IIH IIL Rev.1.0, Sep.19.2003, page 3 of 8 25 −0.4 M54646AP Switching Characteristics Switching Waveform VMA – VMB or VMB – VMA tOFF=0.69 • RT • CT 1 1/2 tOFF tON td VE VCH Timing Chart Two-phase excitation Phase 1 Phase 2 Application Directions (1) Phase Input Phase input determines output mode: Phase H MA H MB L L L H (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 × RT × CT Rev.1.0, Sep.19.2003, page 4 of 8 M54646AP 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. AREA OF SAFE OPERATION OUTPUT CURRENT Io (A) 1.0 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. 0.8 B 0.6 ✽ 0.4 This regulation is for temporary electric power use. For continuous use, be sure power dissipation does not go beyond package’s operational range. B A 0.2 0 0 10 20 30 40 45 50 DRIVER VOLTAGE VMM (V) THERMAL DERATING POWER DISSIPATION (W) 10.0 θj-c = 8°C/W A: Mounted on 25cm2 glassfiber epoxy resin circuit board with one side copper-foiled θc-a = 42°C/W B: With aluminum heat sink (1t) 10cm2 θc-a = 25°C/W C: With aluminum heat sink (1t) 100cm 2 θc-a = 10°C/W Tj(max) = 150°C 8.0 6.0 C 4.0 B A 2.0 0 0 25 50 75 AMBIENT TEMPERATURE (°C) Rev.1.0, Sep.19.2003, page 5 of 8 100 M54646AP Application Example CC1 CC2 1 C1 C2 28 2 VR1 VR2 27 3 VMM1 VMM2 26 4 MA1 MA2 25 24V RC1 RC2 47µF 5 E1 E2 6 23 GND 8 M54646AP 7 RS1 24 22 RS2 GND 21 9 20 10 MB1 11 MB2 19 VMM1 VMM2 18 12 VCC1 VCC2 17 13 T1 T2 16 14 Ph1 Ph2 15 5V CT1 CT2 RT1 Phase1 Phase2 Stepper motor Rev.1.0, Sep.19.2003, page 6 of 8 RT2 RS1, RS2 = 1Ω RC1, RC2 = 1kΩ CC1, CC2 = 820ρF RT1, RT2 = 56kΩ CT1, CT2 = 820ρF M54646AP CAUTIONS (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 short- circuited 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.” Rev.1.0, Sep.19.2003, page 7 of 8 e D b1 b 14 1 Lead Material Cu Alloy 15 Weight(g) 2.2 28 JEDEC Code — SEATING PLANE EIAJ Package Code SDIP28-P-400-1.78 A L E A2 Rev.1.0, Sep.19.2003, page 8 of 8 A1 A A1 A2 b b1 c D E e e1 L Symbol Plastic 28pin 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 0.22 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 28P4B M54646AP Package Dimensions Sales Strategic Planning Div. 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