M54640P MITSUBISHI | Alldatasheet
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MITSUBISHI <CONTROL / DRIVER IC> PIN C O N FIG URAT IO N TO P VIEW each comparator, and then each comparator output triggers monomulti and the current is cut for a certain time (t OFF ) 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. B LOC K D IAGR A M DES CRIPT IO N The M54640P is a semiconductor IC to drive a stepper motor by the bipolar method. FEAT URES l Bipolar and constant-current drive l Wide current control rage (20– 800mA) l Wide supply voltage drive range (10 – 40V) l Built in flywheel diodes l Current level can be changed by steps or continuously. l Built in a thermal shutdown circuit APP LICAT IO N Printer, FDD, HDD, Fax FUNCT IO N 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 (R s ) and the voltage is sensed with Schmitt trigger V R V CC 10 2 16 00 01 10 11 M A M B V MM P h I I V KH V KM V KL Comparator reference input Comparator input C T E One-shot-multi time constant Current sensor Current sensor Output Output Cutput current direction switcing Output current value setting GND Monostable t OFF = 0.69 R T C T Output power supply Outline 16P4 Output O ne-shot-multi time constant Output power Power supply O utput current O utput current Current sensor Output O utput power C omparator reference input Comparator input O utput current M B T V MM GND V CC I P h fi fi fi fi E M A V MM V R C Io GND M54640P setting direction switching value setting supply supply
MITSUBISHI <CONTROL / DRIVER IC> REC O M M ENDE D O PERAT IN G C O NDITIO N S (Ta=25°C, unless otherwise noted) ABS O LUT E M AXIM UM RAT ING S (Ta=25°C, unless otherwise noted) Symbol Ratings UnitParameter Conditions VCC VMM VL VC VR IL IC IMM Pd Topr Tstg Supply voltage Output supply voltage Analog input voltage Comparative input voltage Logic input current Analog input current Output supply current Power dissipation Operating temperature Storage temperature Logic input voltage Mounted on a board -0.3 – 7 -0.3 – 45 -0.3 – 6 -0.3 – VCC -0.3 – 15 -10 -10 –1000 1.92 -20 – 75 -55 – 125 V V V V V mA mA mA W 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. Symbol Parameter Limits Min. Typ. Max. Unit VCC VMM IO tPLH tPHL TON Supply voltage Output supply voltage Output current Logic input rise time Logic input fall time Thermal shutdown temperature 4.75 175 5.25 800 V V mA ms ms EL ECT R ICAL CHARACT ERISTICS (VCC =5V, Ta=25°C, unless otherwise noted) Limits Min. Typ. Max. Symbol Test conditions UnitParameter VIH VIL VCH VCM VCL ICO IOFF Vsat tOFF td ICC IIH IIL Logic input voltage Comparator threshold Comparator input current Output cutoff current Saturation voltage Cutoff time Turnoff delay Supply current Logic input current The voltage at the sensing resistor is not included. IO =500mA “H” “L” “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) VMM =10V, tON ‡5ms Ta=25°C, dVK/dt‡50mV/ms VCC =5V VI=2.4V VI=0.4V 2.0 400 240 -20 430 260 1.6 VCC 0.8 450 280 100 100 4.0 2.0 -0.4 V mV mA mA V ms ms mA mA mA
MITSUBISHI <CONTROL / DRIVER IC> SW ITCHING CHARA CT ER ISTICS H L H L H Current level H L L Low Average High APP LICAT IO N DES CRIPT IO N Testcircuit Switchingw aveform s
- PHASE INPUT Phase input decides the output mode.
- 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 this cutoff time, the current volume decreases slightly and falls short of the comparison level. After the cutoff time (tOFF ), the output stage is in ON state again. This operation is repeated.
- Single pulse generator At the comparator output rise edge, the monostable is triggered. The pulse width of the monostable at the external timing R t and C tis as follows. tOFF = 0.69 x R tC t Retrigger during tOFF is neglected.
- Analog control The output current level can be continuously changed by changing the voltage at VR or the feedback voltage to the comparator.
- 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. PHASE H L M A H M B L L H M B T VMM GND VCC Phase E M A VMM VR C 10 R S R C C V C C VCC C T R T GND : 1W : 1kW : 56kW : 820pF : 820pF : 47mF R S R C R T C C C T C V 1/2 tON tOFF tOFF = 0.69RTCT VMA – VMB orVMB – VMA td VCH VCM VCL
MITSUBISHI <CONTROL / DRIVER IC> TIM ING CHART Phase A Phase B I0, 1 = (A) = 0 I0, 1 = (B) = 0 Phase A Phase B I0, 1= (B) Phase A Phase B I0 (B) I1 (B) I0 (A) I1 (A) 2-phase excitation 1-2-phase excitation Microstep (divided into six) I0, 1= (A)
MITSUBISHI <CONTROL / DRIVER IC> TYPICAL CHARACT ERISTICS (A bsolute m axim um ratings) Safety operating temperature Output current Io (A) 1.0 0.8 0.6 0.4 0.2 00 10 20 30 40 45 50 A B C Output VMM (V) Recommended Schottky diodes should be externally connected between output pins and power supply pins. Schottky diodes should be externally instaalled between output pins and power supply pins and between output pins and GND pin. A : B : C : Mounted on a 25cm 2 glass epoxy board which is coated with copper on one side. qc-a= 45°C/W 10cm 2 aluminum heat sink (1t) is used. qc-a= 25°C/W 100cm 2 aluminum heat sink (1t) is used. qc-a= 10°C/W Tj(max)= 150°C A : qj-c= 10°C/W B : C : Ambient (°C) 10.0 8.0 6.0 4.0 2.0 0 25 7550 A B C Allowable power dissipation (W) 100 Thermal derating
MITSUBISHI <CONTROL / DRIVER IC> APP LICAT IO N EXA M PLE PRE CAUT IO N S FO R U SE (1) When the whole output current changes by a large margin (for example, when overheat protection operation causes intermittent flow of output current), the supply voltage may undergo a change. Therefore, selection and wiring of power supply should be conducted cautiously to avoid such a situation that the supply voltage exceeds the absolute maximum ratings. (2) When the supply voltage changes by a large margin, the operation of this IC may become unstable. In this case, the change of supply voltage can be controlled by connecting a capacitor at the point near to IC pin between Vcc pin and G N D pin. (See above application example.) (3) Thermal shutdown function
- The state of thermal shutdown operation may differ according to the way of wiring within a board. Therefore, sufficient board evaluation should be conducted before use. When the board is changed, operation on the replacing board should be evaluated.
- The circuit board on which this IC is mounted is designed to realize low impedance between power supply and output pin. Therefore, it is desirable to take a safe measure such as fixing a fuse to avoid such a situation that the board is damaged by a fire when output pin is internally short-circuited by excessively applied surge voltage by accident. 820pF 1kW 820pF 1kW 820pF 56kW 820pF 56kW 47mF Stepper motor M5 4640P Phase A I0A I1A 24V Phase B I0B I1B 7654321 15 14 13 12 11 10 9 7654321 15 14 13 12 11 10 9 M5 4640P