M54678FP

M54678FP MITSUBISHI | Alldatasheet

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2-PHASE STEPPER MOTOR DRIVER M 54678FP MITSUBISHI <CONTROL / DRIVER IC> PIN C O N FIG URAT IO N (TO P VIEW )DES CRIPT IO N The M54678FP is a semiconductor integrated circuit designed for stepper motor driver used to printer, PPC and facsimile. FEAT URES l Wide supply voltage range (10 – 35V) l Output current is controlled by PWM operation l Few external components (This IC can be operated with 1 capacitor and 2 resistances) l Voltage stabilizer circuit (Regout = 3.5V) l Thermal protection circuit l Flywheel diode APP LICAT IO N Printers, PPC, facsimile FUNCT IO N The M54678FP is a integrated circuit which can drive two phase stepper motor. The output current direction is determined by phase terminal function, and the output current level is controlled by Vref terminals voltage. B LOC K D IAGR A M Outline 36P2R-D Logic Delay Delay Vm Ph1 En1 Delay Logic Delay Ph2 En2 Logic Logic Vref1S1 Fref Vref2 S2 VTM Rs1 Rs2 Out1 Out1B Out2 Out2B VCC VTL VTH Regout Regulator(3.5V) 1.25V 10K 18KFrequency Generator Spike current cancel QR S FF1 Current comp1 Current comp2 GND Source PWM Source PWM P.GND P.GND Spike current cancel QR S FF2 325 316 289 2710 2611 2512 15 22 16 21 17 20 18 19 M54678FP N.C Out2 Out2B Rs2 Vm N.C N.C Ph2 En2 Vref2 Fref P.GND Out1 Out1B Rs1 Vm N.C VCC Ph1 En1 Vref1 Regout GND GND N.C: no connection

2-PHASE STEPPER MOTOR DRIVER M 54678FP MITSUBISHI <CONTROL / DRIVER IC> V ABS O LUT E M AXIM UM RA TING S (Ta = 25°C unless otherwise noted.) Symbol Conditions UnitParameter Vm Output stage supply voltage -0.3 – 37 PIN FUNCT IO N Iout VCC Vlogic Vanalog Pd Kq Tj Topr Ratings V Output current 1phase –1.0 VSupply voltage A -0.3 – VCC VAnalog input voltage W100mm · 100mm, t = 1.6mm glassfiber epoxy resin circuit board 1.5 °C/W Power dissipation 100mm · 100mm, t = 1.6mm glassfiber epoxy resin circuit board 2.0 Thermal derating 62.5 Junction temperature Operating temperature 150 -20 – 75 Rs Pin Ph, En Pin Vref, S Pin Tstg Storage temperature Logic input voltage -40 – 125 Terminal FunctionsSymbol Output stage supply voltage Output terminal Current sensor Power supply Phase input Enable input Sense input Vref input Voltage stabilizer output Power supply for motor working Motor drive output terminal Output current sensing resistor (Rs) connect terminal Control circuit power supply Output current direction switch “L” input fi Motor on “H” input fi Enable Comparator input voltage terminal Comparator reference voltage terminal Constant voltage output (Vout = 3.5V) Vm Regout Vref1, Vref2 S1, S2 En1, En2 Ph1, Ph2 VCC Rs1,Rs2 Out1, Out1B, Out2, Out2B VRs Current sensor voltage -0.3 – 7 -0.3 – VCC V REC O M M ENDE D O PERA TIO NAL CO NDITIO N S Limits Min. Typ. Max.Symbol UnitParameter VVCC Supply voltage Output stage supply voltageVm V Iout tPLH Output current Logic input rise time 5.0 5.5 800 4.5 mA mS mStPHL Logic input fall time PWM on timeTon mS Toff TSDon PWM off time Thermal shutdown temperature 160 mS

2-PHASE STEPPER MOTOR DRIVER M 54678FP MITSUBISHI <CONTROL / DRIVER IC> EL ECT R ICAL CHARACT ERISTICS (Ta=25°C, VCC =5V, VM =24V unless otherwise noted.) CONTROL CIRCUIT Limits Min. Typ. Max.Symbol Test condition UnitParameter ICC 1 Supply current VCC = 5V, En = H ICC 2 VIL IIL VCH IC VC Iref Fc Logic input voltage (Ph, En terminal) Comparator input offset voltage Comparator input current Comparator input voltage range Vref input current Fref oscillating frequency Vref input voltage range VCC = 5V, En = L Vin = 0V Vref = 500mV, VCH = Vref-S S terminal input current S = 0V, Vref = 500mV Vref terminal input current Vref = 0V, 2 = 500mVÅj VIH Vref FrefH Vreg Fref terminal output voltage Fref terminal Fref terminal, C = 390pF Iout = -0.1mA – +1mA 2.4 -20 -20 VCC 0.6 1.5 0 — 1.5 mA V mA mV mA V mA V kHz V IIH Logic input current (Ph, En terminal) FrefL Regulator output voltage Vin = 5V -5 — 5 2.4 2.5 2.6 0.4 0.5 0.6 20 30 40 3.4 3.5 3.6 -20 -5 — V *Fref oscillating frequency is Career frequency of Output PWM control. OUTPUT CIRCUIT (Ta=25°C, VCC =5V, VM=24V unless otherwise noted.) Limits Min. Typ. Max.Symbol Test condition UnitParameter Vsat Sensing resistor not included. Io = 0.75A Ileak tdoff tdon -100 1.8 0.5 2.0 2.6 +100 2.0 3.5 V mA Output saturation voltage Time until output on after Fref 2.5V fi 0.5V Time until output off after S < Vref Output leak current Output turn-on delay Output turn-off delay mS mS

2-PHASE STEPPER MOTOR DRIVER M 54678FP MITSUBISHI <CONTROL / DRIVER IC> APP LICAT IO N DIRECT IO N S (1) Ph input, En input determines output function. (2) Vref (reference voltage) Output current level is controlled by Vref voltage. (3) Current comparator Under VRS (current sensing resistor voltage) > Vref (reference voltage) condition, the current comparator switches, fip-flop is reset and output circuit is set to off. (4) Oscillating circuit Frequency of PWM operation synchronize with Fref terminal frequency. If you change frequency of PWM operation, please change capacitor value of Fref terminal. This IC is designed oscillating frequency to be 30kHz when capacitor = 390pF is connected to Fref terminal. Oscillating frequency is inversely proportional to capacitor value. When capacitor value become half, Oscillating frequency will be tw o times. (5) Spike current cancellation circuit This IC includes Spike cancellation circuit to prevent the failure function of current comparator by influence of this spike current. Thus, current comparator don’t function during approximately 2mS from the moment of output transistor is set to on. (6) Phase delay circuit This IC includes Phase delay circuit to prevent output through current at Ph switching time. Four output transistors of H bridge don’t function during approximately 3mS at Ph switching time. (7) Rs terminal and S terminal Difference of current sensing that caused by wiring resistance of board (wiring resistance between RS terminal and current sensing resistor) can be prevented by connecting S terminal (plus input of current comparator) to current sensing resistor as close as possible. (8) Voltage stabilizer circuit This IC includes voltage stabilizer circuit. (3.5volts output). Vref reference voltage can be generated by resistance potential dividing from constant voltage output terminal (Regout). Current capability of constant voltage output terminal is I source = +1mA, I sink = -0.1mA Ph* H L L H En* L L H H Out* H L Z Z Out*B L H Z Z *: 1 or 2 Z : High impedance (9) Setting of output current Since output circuit of this IC consists of NPN type transistor, current flow through the motor coil (Iout) becomes approximately 20mA (typical value) smaller than current flow through the current sensing resistor (IRS) by influence of the base current (Ib) of transistor. Thus, please consider this current when you set up output current. OFF ON OFF ON RS Iout MBMA VM VCC Ib = 10mA (Typ.) Iout = IRS - Ib *If Vcc, Tj and manufacturing dispersion are considered, dispersion of Ib will vary maximum –5mA (minimum = 5mA, maximum = 15mA)

2-PHASE STEPPER MOTOR DRIVER M 54678FP MITSUBISHI <CONTROL / DRIVER IC> TH ERM A L D ERAT IN G 0 25 50 75 100 125 150 1.0 2.0 3.0 4.0 5.0 1.2 4.5 Power Dissipation Pdp (W) (*1): Mounted on 100mm · 100mm, t = 1.6mm (copper foil = 35mm ) circuit board Ambient Temperature Ta (°C) With infinite heat sink Without heat sink Mounted on circuit board (*1) APP LICAT IO N CIRCUI T Rrs1, Rrs2= 0.5 – 1.0W Cfref = 390pF STEPPER MOTOR An example of the setting 18 19 M54678FP N.C Ph1 En1 Regout Vref1 Vcc Rs1 Out1B Out1 P.GND N.C N.C Ph2 En2 Fref Vref2 Vm2 Rs2 Out2 Out2B Vm1 N.C GND GND M Rrs2 Vcc Rrs1 Cfref input input input input Vm 3.5V