M54646AP

M54646AP MITSUBISHI | Alldatasheet

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2-PHASE STEPPER MOTOR DRIVER M 54646A P MITSUBISHI <CONTROL / DRIVER IC> PIN C O N FIG URAT IO N TO P VIEW B LOC K D IAGR A M Outline 28P4B DES CRIPT IO N The M54646AP i s a semiconductor IC to drive bipolar stepper motors by controlling winding current with reference to a designated current level. FEAT URES l Wide driver voltage range (10 – 40V) l Wide output current control range (20 – 800mA) l Bipolar and constant current control l Built-in flywheel diode l Built-in thermal protection circuit APP LICAT IO N Office automation equipment such as printers, FDDs, HDDs and facsimiles FUNCT IO N 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 V R (pins and ). Provided with control circuits that output two phases, this IC is sufficient to drive a two-phase bipolar stepper motor. 20 21 22 23 GND Comparator reference voltage input (2) M M V MM Output terminal (2) Output stage supply voltage (2) 6789 GND M M Output terminal (1) TSD Comparator input C One-shot multi time constant T t O FF = 0.69 • R T

• C T Current sensor E Current sensor C Comparator input Mono- stab l e t O FF = 0.69 • R T
• C T Current sensor One-shot multi time constant T E Current sensor (1) Mono- stable Power supply (2) V CC2 Power supply (1) V CC1 Output current direction switch V P Comparator reference voltage input (1) Direction switch output current V P V MM Output stage supply voltage (1) 181527 41 0 2 325 M54646AP C V V MM M E M V MM V CC1 T Ph1 GND fi fi fi fi fi fi fi fi M V MM V CC2 T Ph2 GND C V V MM M E Comparator input (1) Comparator reference v o lt age inp u t Output stage supply voltage (1) Output terminal (1) Current sensor (1) Output terminal (1) Output current direction switch One-shot multi time constant Power supply (1) Output stage supply voltag e (1) Output terminal (2) Output current direction switch One-shot multi time constant Power supply (2) Output stage supply voltage (2) Comparator input (2) Comparator reference voltage input (2) Output stage supply voltage (2) Output terminal (2) Current sensor (2)

2-PHASE STEPPER MOTOR DRIVER M 54646A P MITSUBISHI <CONTROL / DRIVER IC> V ABS O LUT E M AXIM UM RA TING S (Ta = 25°C unless otherwise noted) Symbol Conditions UnitParameter VCC Supply voltage -0.3 – 7 VMM VL VR IL Pd Topr Tstg Ratings VOutput stage supply voltage -0.3 – 45 VLogic input voltage VReference input voltage -0.3 – 15 mALogic input current -10 WPower dissipation 1.92 °COperating temperature °CStorage temperature -0.3 – 6 -20 – 85 -55 – 125 VC IC mAAnalog input current -10 IO mAOutput current Measured with IC mounted on board –1000 Analog input voltage -0.3 – VCC V REC O M M ENDE D O PERA TIO NAL CO NDITIO N S (Ta = 25°C unless otherwise noted) V Limits Min. Typ. Max.Symbol UnitParameter VCC Supply voltage 5 5.54.5 VVMM Output stage supply voltage 4010 mAIO Output current 80020 mstPLH Logic input rise time 2 mstPHL Logic input fall time 2 °CTON Thermal shutdown temperature 165 EL ECT R ICAL CHARACT ERISTICS (VCC = 5V, Ta = 25°C unless otherwise noted) Limits Min. Typ. Max.Symbol Test Conditions UnitParameter VIH Logic input voltage Comparator threshold voltage VCC 450 100 3.5 2.0 430 1.6 2.0 -20 400 -0.4 Output cutoff current VCC = 5V“H” “L”VIL ICH ICO IOFF Comparator input current VR = 5V Total saturation voltage Cutoff time Turn-off delay Power current Logic input current Vsat tOFF td ICC IIH IIL Sensing resistance is not included. (IO = 500mA) VMM = 10V, tON ‡ 5ms dVK/dt ‡ 50mV/ms VCC = 5V, 1 phase VI= 2.4V VI= 0.4V “H” “L” 0.80 V mA mA mA V ms ms V mA mA mA

2-PHASE STEPPER MOTOR DRIVER M 54646A P MITSUBISHI <CONTROL / DRIVER IC> SW ITCHING CHAR ACT ER ISTIC S SW ITCHING WAV EFO R M APP LICAT IO N DIRECT IO N S (1) Phase input Phase input determines output mode: (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 · R T · C T 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. PHASE H L M A H L M B L H TIM ING CHART 1/2 tON tOFF tOFF =0.69 • RT • CT VMA – VMB orVMB – VMA td VCH VE Two-phase excitation Phase 1 Phase 2

2-PHASE STEPPER MOTOR DRIVER M 54646A P MITSUBISHI <CONTROL / DRIVER IC> 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. ] This regulation is for temporary electric power use. For continuous use, be sure power dissipation does not go beyond package’s operational range. qj-c = 8°C/W A: Mounted on 25cm glassfiber epoxy resin circuit board with one side copper-foiled qc-a = 42°C/W B: With aluminum heat sink (1t) 10cm qc-a= 25°C/W C: With aluminum heat sink (1t) 100cm qc-a= 10°C/W Tj(max)= 150°C AREA OF SAFE OPERATION OUTPUT CURRENT Io (A) 1.0 0.8 0.6 0.4 0 102 03 0 40 45 50 A B DRIVER VOLTAGE V MM (V) B 0.2 THERMAL DERATING POWER DISSIPATION (W) 10.0 8.0 6.0 4.0 0 25 50 75 100 A B AMBIENT TEMPERATURE ( °C) C 2.0

2-PHASE STEPPER MOTOR DRIVER M 54646A P MITSUBISHI <CONTROL / DRIVER IC> APP LICAT IO N EXA M PLE C 1 VR1 VMM 1 M A1 GND VMM 1 VCC1 Ph1 C 2 28 VR2 27 VMM 2 26 M A2 25 GND VMM 2 18 17VCC2 16T2 15Ph2 C T1 M B1 M B2 M54646AP R S1, RS2 = 1W R C1 , RC2 = 1kW C C1 , CC2 = 820rF R T1, RT2 = 56kW C T1, CT2 = 820rF Stepper motor R T1 Phase1 R S1 C C1 R C1 E1 E2 C T2 R T2 Phase2 R S2 C C2 R C2 24V 47mF

2-PHASE STEPPER MOTOR DRIVER M 54646A P MITSUBISHI <CONTROL / DRIVER IC> CAUT IO N (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.”