MITSUBISHI <CONTROL / DRIVER IC> M54678FP 2-PHASE STEPPER MOTOR DRIVER DESCRIPTION PIN CONFIGURATION (TOP VIEW) The M54678FP is a semiconductor integrated circuit designed for stepper motor driver used to printer, PPC and facsimile. FEATURES ● Wide supply voltage range (10 – 35V) ● Output current is controlled by PWM operation ● Few external components (This IC can be operated with 1 capacitor and 2 resistances) ● Voltage stabilizer circuit (Regout = 3.5V) ● Thermal protection circuit ● Flywheel diode 1 36 N.C Out1 2 35 Out2 Out1B 3 34 Out2B Rs1 4 33 Rs2 S1 5 32 S2 Vm 6 31 Vm 7 30 8 29 APPLICATION Printers, PPC, facsimile 9 GND FUNCTION 10 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. 11 M54678FP P.GND 28 GND 27 26 12 25 N.C 13 24 N.C VCC 14 23 N.C Ph1 15 22 Ph2 En1 16 21 En2 Vref1 17 20 Vref2 Regout 18 19 Fref Outline 36P2R-D N.C: no connection BLOCK DIAGRAM Out1 Vm Out1B Out2 Out2B Ph1 Ph2 En1 En2 Delay Delay P.GND VCC P.GND Spike current cancel Current comp1 Delay Source PWM Logic Logic Logic Source PWM Logic Delay R Q FF1 S Q R FF2 S Frequency Generator Spike current cancel Regulator(3.5V) 1.25V Current comp2 VTH 10K Regout 18K VTL VTM Rs1 S1 Vref1 Fref Vref2 S2 Rs2 GND MITSUBISHI <CONTROL / DRIVER IC> M54678FP 2-PHASE STEPPER MOTOR DRIVER PIN FUNCTION Symbol Terminal Functions Output stage supply voltage Output terminal Current sensor Power supply Phase input Enable input Sense input Vref input Voltage stabilizer output Vm Out1, Out1B, Out2, Out2B Rs1,Rs2 VCC Ph1, Ph2 En1, En2 S1, S2 Vref1, Vref2 Regout 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 → Motor on “H” input → Enable Comparator input voltage terminal Comparator reference voltage terminal Constant voltage output (Vout = 3.5V) ABSOLUTE MAXIMUM RATINGS (Ta = 25°C unless otherwise noted.) Symbol Parameter Conditions Ratings Unit -0.3 – 37 ±1.0 -0.3 – 7 -0.3 – VCC -0.3 – VCC 1.5 V A V V V V Vm Iout VCC Vlogic Vanalog VRs Output stage supply voltage Output current Supply voltage Logic input voltage Analog input voltage Current sensor voltage Pd Power dissipation 100mm × 100mm, t = 1.6mm glassfiber epoxy resin circuit board 2.0 W Kθ Thermal derating 100mm × 100mm, t = 1.6mm glassfiber epoxy resin circuit board 62.5 °C/W Tj Topr Tstg Junction temperature Operating temperature Storage temperature 150 -20 – 75 -40 – 125 °C °C °C 1phase Ph, En Pin Vref, S Pin Rs Pin RECOMMENDED OPERATIONAL CONDITIONS Symbol VCC Vm Iout tPLH tPHL Ton Toff TSDon Parameter Supply voltage Output stage supply voltage Output current Logic input rise time Logic input fall time PWM on time PWM off time Thermal shutdown temperature Min. 4.5 10 50 — — 5 5 — Limits Typ. 5.0 — — — — — — 160 Max. 5.5 35 800 2 2 50 50 — Unit V V mA µS µS µS µS °C MITSUBISHI <CONTROL / DRIVER IC> M54678FP 2-PHASE STEPPER MOTOR DRIVER ELECTRICAL CHARACTERISTICS (Ta=25°C, VCC=5V, VM=24V unless otherwise noted.) CONTROL CIRCUIT Symbol Parameter ICC1 ICC2 VIH VIL IIH IIL VCH Logic input current (Ph, En terminal) Comparator input offset voltage IC Comparator input current VC Comparator input voltage range Supply current Test condition VCC = 5V, En = H VCC = 5V, En = L Logic input voltage (Ph, En terminal) Iref Vref input current Vref FrefH FrefL Fc Vreg Vref input voltage range Vin = 5V Vin = 0V Vref = 500mV, VCH = Vref-S S terminal input current S = 0V, Vref = 500mV Vref terminal input current Vref = 0V, 2 = 500mVÅj Fref terminal output voltage Fref terminal Fref oscillating frequency Regulator output voltage Fref terminal, C = 390pF Iout = -0.1mA – +1mA Min. 19 34 2.4 0 -5 -20 -5 Limits Typ. 33 58 — — — — +1 Max. 50 87 VCC 0.6 5 5 +7 -20 -5 — µA 0 — 1.5 V -20 — µA 0 2.4 0.4 20 3.4 -5 — — 2.5 0.5 30 3.5 1.5 2.6 0.6 40 3.6 V Min. — -100 — — Limits Typ. 1.8 — 0.5 2.0 Max. 2.6 +100 2.0 3.5 Unit mA V µA mV V kHz V *Fref oscillating frequency is Career frequency of Output PWM control. OUTPUT CIRCUIT (Ta=25°C, VCC=5V, VM=24V unless otherwise noted.) Symbol Vsat Ileak tdon tdoff Parameter Output saturation voltage Output leak current Output turn-on delay Output turn-off delay Test condition Sensing resistor not included. Io = 0.75A Time until output on after Fref 2.5V → 0.5V Time until output off after S < Vref Unit V µA µS µS MITSUBISHI <CONTROL / DRIVER IC> M54678FP 2-PHASE STEPPER MOTOR DRIVER APPLICATION DIRECTIONS (1) Ph input, En input determines output function. Ph* H L H L *: 1 or 2 Z : High impedance En* L L H H Out* H L Z Z Out*B L H Z Z (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. VM (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 two 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 2µS 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 3µS 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 ON OFF Iout VCC MB MA ON Ib = 10mA (Typ.) OFF RS Iout = IRS - Ib *If Vcc, Tj and manufacturing dispersion are considered, dispersion of Ib will vary maximum ±5mA (minimum = 5mA, maximum = 15mA) MITSUBISHI <CONTROL / DRIVER IC> M54678FP 2-PHASE STEPPER MOTOR DRIVER THERMAL DERATING With infinite heat sink 5.0 Mounted on circuit board (*1) Power Dissipation Pdp (W) 4.5 4.0 Without heat sink 3.0 2.0 1.2 1.0 0 50 25 75 100 125 150 Ambient Temperature Ta (°C) (*1): Mounted on 100mm × 100mm, t = 1.6µm (copper foil = 35µm) circuit board APPLICATION CIRCUIT STEPPER MOTOR M Rrs1 Vm 1 P.GND 2 Out1 3 Out1B 4 Rs1 5 S1 6 Vm1 N.C 36 Out2 35 Out2B 34 Rs2 33 S2 32 Vm2 31 30 8 29 9 10 GND 11 M54678FP 7 An example of the setting Rrs1, Rrs2 = 0.5 – 1.0Ω Cfref = 390pF 28 GND 27 26 12 Vcc Rrs2 25 13 N.C N.C 24 14 Vcc N.C 23 input 15 Ph1 Ph2 22 input input 16 En1 input 17 Vref1 18 Regout 3.5V En2 21 Vref2 20 Fref 19 Cfref