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| 2-Phase/1-2 Phase Excitation SDK03M 2-Phase Stepper Motor Unipolar Driver ICs sAbsolute Maximum Ratings Parameter Motor supply voltage FET Drain-Source voltage Control supply voltage TTL input voltage Reference voltage Output current Power dissipation Channel temperature Storage temperature Symbol VCC VDSS VS VIN VREF IO PD Tch Tstg Ratings 46 100 46 7 2 1 2.5 (Without Heatsink) +150 -40 to +150 Units V V V V V A W C C sElectrical Characteristics Parameter Control supply current Control supply voltage FET Drain-Source voltage FET ON voltage FET drain leakage current Symbol IS Condition VS VDSS Condition VDS Condition IDSS Condition VSD Condition IIH Condition IIL Condition VIH Condition VIL Condition VIH Condition VIL Condition Tr Condition Tstg Condition Tf Condition 10 100 min Ratings typ 5 VS=44V 24 VS=44V, IDSS=250A 0.85 ID=1A, VS=14V 4 VDSS=100V, VS=44V 1.2 ID=1A 40 VIH=2.4V, VS=44V -0.8 VIL=0.4V, VS=44V 2 ID=1A 0.8 VDSS=100V 2 VDSS=100V 0.8 ID=1A 0.5 VS=24V, ID=0.8A 0.7 VS=24V, ID=0.8A 0.1 VS=24V, ID=0.8A V V max 7.5 44 Units mA V V V mA V DC characteristics FET diode forward voltage A mA TTL input current TTL input voltage (Active High) TTL input voltage (Active Low) AC characteristics Switching time s 36 SDK03M 2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation) SDK03M sInternal Block Diagram 8 9 1 16 6 IN1 5 IN2 7 VS 1, 8, 9, 16pin Description of pins Excitation input Active H Active L Reg. 14 NC Pin 1 Pin 16 Pin 8 Pin 9 OUT1 OUT2 OUT2 OUT1 11 NC + - + - RS 10 RS 15 RS 13 GND 4 GND 12 TD 2 REF 3 sDiagram of Standard External Circuit (Recommended Circuit Constants) Active High VCC (46V max) Excitation signal time chart 2-phase excitation Phase clock IN1 IN2 IN1 Phase B IN2 Phase A 0 H L H L 1 L H H L 2 L H L H 3 H L L H 0 H L H L 1 L H H L r1 : r2 : r3 : r4 : r5 : r6 : C1 : C2 : C3 : C4 : RS : 510 100 (VR) 47k 47k 2.4k 2.4k 470pF 470pF 2200pF 2200pF 1.8 typ + Motor coil Phase A Vb (5V) Motor coil Phase B 1 16 8 9 7 Active High IN1 IN2 6 OUT1 OUT2 IN1 IN2 GND 12 4 15 10 VS r3 r1 r4 2 2 7 1 16 8 9 VS OUT1 OUT2 6 IN1 Phase B IN2 GND 15 10 4 12 5 IN1 IN2 SDK03M 5 SDK03M TD 3 Phase A RS 13 Active High TD 3 REF REF 13 RS 1-2-phase excitation Phase clock IN1 IN2 IN1 Phase B IN2 Phase A 0 H L L L 1 H L H L 2 L L H L 3 L H H L 4 L H L L 5 L H L H 6 L L L H 7 H L L H 0 H L L L 1 H L H L 2 L L H L 3 L H H L (1 to 2W) C3 RS r5 C1 r2 C2 r6 C4 RS Active Low VCC (46V max) + Motor coil Phase A Vb (5V) Motor coil Phase B Excitation signal time chart 2-phase excitation Phase clock 0 1 2 3 0 IN1 L H H L L Phase A IN2 H L L H H IN1 L L H H L Phase B HH L L H IN2 1 H L L H 1 16 8 9 7 Active Low IN1 IN2 6 OUT2 OUT1 IN1 IN2 GND 12 4 15 10 VS r3 r1 r4 2 2 7 1 16 8 9 VS OUT2 OUT1 6 IN1 Phase B IN2 GND 15 10 4 12 5 IN1 IN2 SDK03M 5 SDK03M TD 3 Phase A RS 13 Active Low TD 3 REF REF 13 RS 1-2-phase excitation Phase clock IN1 IN2 IN1 Phase B IN2 Phase A 0 L H H H 1 L H L H 2 H H L H 3 H L L H 4 H L H H 5 H L H L 6 H H H L 7 L H H L 0 L H H H 1 L H L H 2 H H L H 3 H L L H (1 to 2W) r1 : r2 : r3 : r4 : r5 : r6 : C1 : C2 : C3 : C4 : RS : 510 100 (VR) 47k 47k 2.4k 2.4k 470pF 470pF 2200pF 2200pF 1.8 typ C3 RS r5 C1 r2 C2 r6 C4 RS SDK03M 37 2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation) SDK03M sExternal Dimensions (Unit: mm) 0.890.15 0.75 -0.05 +0.15 2.540.25 9 16 6.8max. Part No. Lot No. 1 20.0max. 8 8.00.5 6.30.2 0.3 -0.05 +0.15 19.560.2 0.25 1.00.3 3.00.2 9.80.3 38 SDK03M 1.4 0.2 0~0.1 4.0max. 3.6 0.2 2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation) SDK03M Application Notes sDetermining the Output Current Fig. 1 shows the waveform of the output current (motor coil current). The method of determining the peak value of the output current (IO) based on this waveform is shown below. (Parameters for determining the output current IO) Vb: Reference supply voltage r1,r2: Voltage-divider resistors for the reference supply voltage RS: Current sense resistor (1) Normal rotation mode IO is determined as follows when current flows at the maximum level during motor rotation. (See Fig.2.) Vb r2 ................................................................ (1) IO * r1+r2 RS (2) Power down mode The circuit in Fig.3 (rx and Tr) is added in order to decrease the coil current. IO is then determined as follows. IOPD 1+ 1 r1(r2+rX) r2 * rX * Fig. 1 Waveform of coil current (Phase A excitation ON) IO Phase A 0 Phase A Fig. 2 Normal mode Vb(5V) r1 r6 r5 r2 C3 10 13 15 RS 3 Vb ......................................................... (2) RS Equation (2) can be modified to obtain equation to determine rx. 1 rX= 1 1 Vb -1 - r1 Rs * IOPD r2 Fig. 4 and 5 show the graphs of equations (1) and (2) respectively. Fig. 3 Power down mode Vb(5V) r6 r1 r5 rX Power down signal Tr RS r2 C3 10 13 15 3 Fig. 4 Output current IO vs. Current sense resistor RS 4 Fig. 5 Output current IOPD vs. Variable current sense resistor rx 2.0 2 r2 * Vb r1+r2 RS r1=510 r2=100 rx= Vb=5V IO= Output current IOPD (A) Output current IO (A) 3 1.5 RS =0.5 1 * Vb r1(r2+rX) RS 1+ r2 * rX r1=510 r2=100 Vb=5V IOPD= 1.0 RS =0.8 RS =1 1 0.5 0 0 1 2 3 4 00 200 400 600 800 1000 1200 Current sense resistor RS () Variable current sense resistor rX () (NOTE) Ringing noise is produced in the current sense resistor RS when the MOSFET is switched ON and OFF by chopping. This noise is also generated in feedback signals from RS which may therefore cause the comparator to malfunction. To prevent chopping malfunctions, r5(r6) and C3(C4) are added to act as a noise filter. However, when the values of these constants are increased, the response from RS to the comparator becomes slow. Hence the value of the output current IO is somewhat higher than the calculated value. SDK03M 39 2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation) SDK03M sDetermining the chopper frequency Determining TOFF SDK03M is self-excited choppers. The chopping OFF time TOFF is fixed by r3/C1 and r4/C2 connected to terminal Td. TOFF can be calculated using the following formula: 2 Vb 2 Vb Fig. 6 Chopper frequency vs. Motor coil resistance 60 15 Chopping frequency f (kHz) 1.0 50 ON time TON ( s) TOFF-r3 * C1r (1- n =-r4 * C2 r (1- n ) 40 30 VC C 20 =2 4V The circuit constants and the TOFF value shown below are recommended. TOFF = 12s at r3=47k, C1=500pF, Vb=5V 25 V 20 10 0 VCC =36 30 35 40 r3 = r4 = 47k 500pF C1 C2 TOFF =12s RS =1 Lm =1~3ms Rm 0 2 46 8 10 12 14 16 Motor coil resistance Rm () sChopper frequency vs. Supply voltage sChopper frequency vs. Output current 50 50 40 40 f (kHz) 20 Motor : 23LM-C202 IO = 0.8A at VCC=24V RS=1 f (kHz) 30 30 20 Motor : 23LM-C202 VCC=24V RS=1 10 10 0 0 10 20 30 40 50 0 0 0.2 0.4 0.6 0.8 VCC (V) IO (A) 40 SDK03M 2-Phase Stepper Motor Unipolar Driver ICs (2-Phase/1-2 Phase Excitation) SDK03M sThermal Design An outline of the method for computing heat dissipation is shown below. (1) Obtain the value of PH that corresponds to the motor coil current IO from Fig. 7 "Heat dissipation per phase PH vs. Output current IO." Fig. 7 Heat dissipation per phase PH vs. Output current IO 1.2 (2) The power dissipation Pdiss is obtained using the following formula. 2-phase excitation: Pdiss PH+0.0075xVS (W) 3 PH+0.0075xVS (W) 1-2 phase excitation: Pdiss 4 (3) Obtain the temperature rise that corresponds to the calculated value of Pdiss from Fig. 8 "Temperature rise." Fig. 8 Temperature rise 150 Heat dissipation per phase PH (W) 1 0.8 VC 0.6 24 V Motor : 23LM-C202 Holding mode V T j 36 V Tj-a (C) TC-a C =4 4V 100 Glass epoxy board (mounted on level surface) (95x69x1.2mm) Natural cooling 15 0.4 T C 50 0.2 0 0 0.2 0.4 0.6 0.8 1.0 0 0 Output current IO (A) 1 2 Total power (W) 3 Thermal characteristics 50 Case temperature rise TC-a (C) 40 TC ( 9 pin) 30 Natural cooling Glass epoxy board (mounted on level surface) (95x69x1.2mm) Motor : PH265-01B Motor current IO=0.8A Ta=25C VCC=24V, VS=24V 2-phase excitation 20 10 0 200 500 1K Response frequency (pps) sSupply Voltage VCC vs. Supply Current ICC 500 sTorque Characteristics 2.0 Supply current ICC (mA) 400 Pull-out torque (kg-cm) 1.5 300 Motor : 23LM-C202 1-phase excitation Holding mode IO : Output current IO=1A 1.0 200 Motor : PX244-02 Output current IO =0.6A Motor supply voltage VCC =24V 2-phase excitation 100 0.5 0.4A 0.2A 0 10 20 30 40 50 0 100 500 1K 5K 0 Supply voltage VCC (V) Response frequency (pps) sNote The excitation input signals of the SDK03M can be used as either Active High or Active Low. Note, However, that the corresponding output (OUT) changes depending on the input (IN). Active High Input IN1 (pin6) IN2 (pin5) Corresponding output OUT1 (pin1, 16) OUT2 (pin8, 9) Active Low Input IN1 (pin6) IN2 (pin5) Corresponding output OUT1 (pin8, 9) OUT2 (pin1, 16) SDK03M 41 |
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