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M54640P Dataheets PDF



Part Number M54640P
Manufacturers Mitsubishi
Logo Mitsubishi
Description STEPPER MOTOR DRIVER
Datasheet M54640P DatasheetM54640P Datasheet (PDF)

MITSUBISHI M54640P STEPPER MOTOR DRIVER DESCRIPTION The M54640P is a semiconductor IC to drive a stepper motor by the bipolar method. PIN CONFIGURATION (TOP VIEW) Output MB ← 1 One-shot-multi T→ 2 time constant Output power VMM 3 supply 4 GND 5 Power supply VCC Output current value setting Output current direction switching I1 6 7 16 → E 15 → MA 14 13 GND 12 11 ← VR 10 ← C 9 Io Comparator reference input Comparator input Output current setting Current sensor Output FEAT.

  M54640P   M54640P



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MITSUBISHI M54640P STEPPER MOTOR DRIVER DESCRIPTION The M54640P is a semiconductor IC to drive a stepper motor by the bipolar method. PIN CONFIGURATION (TOP VIEW) Output MB ← 1 One-shot-multi T→ 2 time constant Output power VMM 3 supply 4 GND 5 Power supply VCC Output current value setting Output current direction switching I1 6 7 16 → E 15 → MA 14 13 GND 12 11 ← VR 10 ← C 9 Io Comparator reference input Comparator input Output current setting Current sensor Output FEATURES q Bipolar and constant-current drive q Wide current control rage (20 – 800mA) q Wide supply voltage drive range (10 – 40V) q Built in flywheel diodes q Current level can be changed by steps or continuously. q Built in a thermal shutdown circuit power VMM Output supply M54640P Ph → 8 APPLICATION Printer, FDD, HDD, Fax Outline 16P4 FUNCTION The M54640P drives a stepper motor by the bipolar drive method to change the current direction of a single coil and controls the current direction with PHASE input pin. In order to obtain higher efficiency, the constant current drive system to control the coil current is introduced. The current value can be selected among four levels (0 to max.) by selecting the combination of three internal comparators by logic input. It also can be continuously changed by controlling the reference voltage. Conversion to voltage is conducted by the current value sensing resistor (Rs) and the voltage is sensed with each comparator, and then each comparator output triggers monomulti and the current is cut for a certain time (tOFF) by utilizing the inductance of the coil. Also, diodes needed for choppering and a thermal shutdown circuit as a countermeasure against overvoltage are built in this circuit. BLOCK DIAGRAM Comparator reference input VCC VR 11 6 Schmitt trigger Cutput current Ph 8 direction switcing I1 7 I0 9 >1 >1 1 1 1 Output MA Output MB 3 VMM 14 Output power supply 15 1 Output current value setting 00 VKH 01 10 11 VKM Monostable tOFF = 0.69 • RT CT Current sensor VKL 4 GND 5 12 13 10 C Comparator input 2 16 E Current sensor T One-shot-multi time constant MITSUBISHI M54640P STEPPER MOTOR DRIVER ABSOLUTE MAXIMUM RATINGS (Ta=25°C, unless otherwise noted) Symbol VCC VMM VL VC VR IL IC IMM Pd Topr Tstg Parameter Supply voltage Output supply voltage Logic input voltage Analog input voltage Comparative input voltage Logic input current Analog input current Output supply 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 – 75 -55 – 125 Unit V V V V V mA mA mA W °C °C Mounted on a board Note. Every voltage value is measured when the voltage at GND pin is 0V. The maximum and the minimum of each voltage value are shown in absolute values. Regarding current directions, inflow current is shown in a positive value and outflow current is shown in a negative value. The maximum and the minimum of each current value are shown in absolute values. RECOMMENDED OPERATING CONDITIONS (Ta=25°C, unless otherwise noted) Symbol VCC VMM IO tPLH tPHL TON Parameter Supply voltage Output supply voltage Output current Logic input rise time Logic input fall time Thermal shutdown temperature Min. 4.75 10 20 Limits Typ. 5 Max. 5.25 40 800 2 2 Unit V V mA µs µs °C 175 ELECTRICAL CHARACTERISTICS (VCC=5V, Ta=25°C, unless otherwise noted) Symbol VIH VIL VCH VCM VCL ICO IOFF Vsat tOFF td ICC IIH IIL Parameter Logic input voltage “H” “L” VCC=5V VR=5V, I0=I1=0 VR=5V, I0=1,I1=0 VR=5V, I0=0, I1=1 I0=I1=1(Ta=25°C) The voltage at the sensing resistor is not included. IO=500mA VMM=10V, tON≥5µs Ta=25°C, dVK/dt≥50mV/µs VCC=5V VI=2.4V VI=0.4V 25 30 1.6 Test conditions Min. 2.0 0 400 240 75 -20 Limits Typ. Max. VCC 0.8 450 280 100 20 100 4.0 35 2.0 25 20 -0.4 Unit V Comparator threshold Comparator input current Output cutoff current Saturation voltage Cutoff time Turnoff delay Supply current Logic input current “H” “L” 430 260 90 mV µA µA V µs µs mA µA mA MITSUBISHI M54640P STEPPER MOTOR DRIVER SWITCHING CHARACTERISTICS Test circuit Switching waveforms VMA – VMB or VMB – VMA tOFF = 0.69RTCT 1 CT 1 MB 2 T 3 VMM RT 4 GND 5 6 VCC 7 I1 8 Phase GND 12 VR 11 C 10 I0 9 CC VCH VCM VCL 13 RC td E 16 MA 15 VMM 14 CV RS VCC 1/2 tON tOFF RS :1Ω RC : 1kΩ RT : 56kΩ CC : 820pF CT : 820pF CV : 47µF APPLICATION DESCRIPTION • PHASE INPUT Phase input decides the output mode. PHASE H L • I0, I1 I0 and I1 fixed based on the comparison voltage VR decide the output current level. The current level can be continuously changed by changing the voltage at VR continuously. I0 H L H L I1 H H L L Current level 0 Low Average High MA H L MB L H • Current sensor When the voltage fall at the current sensing resistor and the selected current level becomes of the same level, the comparator triggers the monostable. Then, the output stage is cut off for a certain time (tOFF). During thi.


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