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| 5-phase Stepper Motor Star Connection Unipolar Driver IC SI-7500A s Ratings Absolute maximum rating Type No. SI-7500A Supply voltage (V) VCC 40 Vb 8 Output current (A) Io 1.2 Junction temperature (C) Tj +125 Operating ambient temperature (C) Top -20 to +80 (Ta = 25C) Storage temperature (C) Tstg -30 to +100 s Characteristics Electrical characteristics Vb input External *Input voltage *Input current zener diode current breakdown voltage (V) (mA/o) (%) (mA) (V) (V) (mA) VCC Vb IO IOPD/IO Ib VZ VIH1 VIH2 VIL IIH1 IIH2 min typ max min typ max min typ max min typ max max min max max max max max max 17 24 30 4.5 5 5.5 200 750 1000 35 50 100 15 VCC x1.5 50 3.9 1.3 0.6 0.21 0.22 Operating supply voltage Output current Power down Ratio Trigger pulse voltage (V) Vtrig min max 4.0 Vb Trigger pulse time (Ta = 25C) Trigger pulse frequency (kHz) Ftrig typ max 20 25 Type No. SI-7500A (s) Ttrig min typ 1.0 2.0 s Block diagram Main power supply VCC Auxiliary power supply Vb Variable current resistor Excitation signal 2-3 phase excitation Reference voltage Comparator amplifier Current controller Excitation signal amplifier Zener diode for canceling counter EMF ZD Rx Trigger pulse generator circuit M Counter EMF Canceller * Input voltage and input current conditions VIH1 : Vb = 5V, Q1 to Q5ON RX = , IIN = 0.2mA VIH2 : Vb = 5V, Q1 to Q5OFF, IIN = 0.22mA IIH1 : Vb = 5V, Q1 to Q5ON, VIN = 3.7V IIH2 : Vb = 5V, Q1 to Q5OFF, VIN = 0.9V SI-7500A Current detection resistor Rs s Equivalent circuit diagram w q @0 Q6 R36 D11 D6 R46 R1 R6 D1 Q11 R11 Q1 R47 R26 R16 R21 R31 R32 R41 MIC1 R37 R7 R42 Q7 R2 Q12 D2 R12 R17 R22 R27 R28 Q2 D12 D7 D13 D8 R3 D3 Q13 R13 Q3 R18 R23 R34 R19 R24 R29 R30 Q8 R38 R8 R43 R39 Q9 R9 R4 Q14 D4 R44 R14 Q4 Q5 D14 D15 R5 D5 Q15 R15 Q10 R40 R10 R45 MIC3 R20 R25 R35 ri t o !2 !5 !3 !6 !9 u D9 D10 !8 e y !0 !1 !4 !7 43 SI-7500A s Diagram of external circuits SI-7500A VCC + 5-phase stepper motor 100 F 50V ZD 1 ZD 20 VCC 2 OUT-1 5 OUT-2 9 OUT-3 13 OUT-4 16 OUT-5 Vb VR 44k 7 VR 300 8 4 7 1k 2SA561 1S1555 Vb IN-1 IN-2 4 8 12 15 19 3.9k SI-7500A 18 Vief. IN-3 IN-4 IN-5 2 6 5 Excitation signal input (Active High) 2-3 phase excitation 555 1 3 GND RS1 RS2 RS3 RS4 RS5 1000pF 1k RX 0.01F 11 3 6 10 14 17 RS1 RS2 RS3 RS4 RS5 RS1 to RS5 : Current detection resistor RX : Variable current resistor Power down signal input (Active high) s External dimensions (Unit: mm) Plastic package s Supply voltage vs. Output current (Typical value, Motor : PH566-B Rs = 1 Vb = 5.0V 69.00.5 63.00.4 7.00.5 3.5 1.2 Rx = Output current Io (A) 1.0 0.8 0.6 2k 1k 510 200 16.6 35.00.5 Type No. Lot No. 8.0 3.4 1.8 3.8 8.61 0.4 0.2 0 100 3 P=2.54 Pin No. 12....................................20 1.4 0.5 0 20 24 30 Supply voltage VCC (V) s Case temperature vs. Output current s Torque characteristics 1.0 (Typical value) VCC=24V Motor : PH566-B 2.5 Output current Io (A) 0.8 Pull-out torque OUT (kg-cm) 2.0 0.6 1.5 0.4 1.0 0.2 0.5 Supply voltage VCC = 24V Vb = 5V Output current Io = 0.8 A/phase (fixed) Counter EMF canceler Zener diode Vz = 49V Motor : PH566B 0 0 25 50 75 100 0 0 0.1 0.2 0.5 1 2 5 10 20 Case temperature Tc (C) Response frequency f (kpps) 44 SI-7500A Application Note s Determining the output current IO (motor coil current) The main elements that determine the output current are Current detection resistor Rs, Supply voltage Vb, and Variable current resistor RX. (1) Normal mode To operate a motor at maximum current level, set RX to infinity (open). From Fig. A, when the maximum output current ripple is designated as IOH, its value will be, VRSH IOH = ....................................................... [A] RS VRSH can be computed as follows: VRSH = 0.2 Vb + 0.213 (center value) .............. [B] From equations [A] and [B], the output current IOH can be computed as follows: I (0.2 Vb + 0.213) IOH = RS The relationship between IOH and RS is shown in Fig. B. (2) Power down mode When an external resistor RX is connected, VRSH changes as shown in the Fig. B even when RS is retained. Obtain the power down output current IOHPD from Fig. B and equation [A]. VRSH (V) Fig. A IOH Waveform of output current Fig. B 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 Vb + 0.1 VRSH(max) = 4.69 + 1.92 + 0.2 (V) Rx Vb + 0.09 VRSH(min) = 5.25 + 2.06 + 0.15 (V) Rx VRSH Max. (Vb = 5.0V) VRSH Min. (Vb = 5.0V) (Rx : k) 1 2 3 4 External resistor Rx (k) s Thermal design Obtain the internal power dissipation that corresponds to the output current to be required from Fig. C, multiply this by three, and determine the size of the heatsink from the derating curve in Fig. D. The derating curve is based on junction temperature of 125C. However, make some allowance so that Tc is 85C or less and then select the proper heatsink size. Fig. C SI-7500A Internal power dissipation per phase PD vs. Output current IO Fig. D SI-7500A Derating curve 20 (Typical value) Motor : PH566-B Vb = 5V Holding mode 150 x 100 Power dissipation per phase Pdiss/ (W) 6 100 x 100 Heatsink : Aluminum Thickness : 2 mm 4 Power dissipation PD (W) 5 15 50 x 100 10 Without heatsink 3 VCC = 30V 24V 20V 2 5 1 0 0 0.2 0.4 0.6 0.8 1.0 1.2 0 0 20 40 60 80 Output current lo (A) Ambient temperature Ta (C) 45 SI-7200M, SI-7230M, SI-7115B, SI-7300A, SI-7330A, SI-7500A and SI-7502 Handling Precautions (Note: The SI-7502 is applicable for item (2) only.) For details, refer to the relevant product specifications. (1) Tightening torque: The torque to be applied in tightening screws when mounting the IC on a heatsink should be below 49N*m. (2) Solvent: Do not use the following solvents: Substances that Chlorine-based solvents : Trichloroethylene, dissolve the package Trichloroethane, etc. Aromatic hydrogen compounds : Benzene, Toluene, Xylene, etc. Ketone and Acetone group solvents Substances that weaken the package (3) Silicone grease: The silicone grease to be used between the aluminum base plate of the hybrid IC and the heatsink should be any of the following: * G-746 * YG6260 * SC102 SHINETSU CHEMICAL INDUSTRIES CO., LTD. TOSHIBA SILICONE CO., LTD. DOW CORNING TORAY SILICONE CO., LTD. Gasoline, Benzine and Kerosene Please pay sufficient attention in selecting silicone grease since oil in some grease may penetrate the product, which will result in an extremely short product life. Others * Resistance against radiation Resistance against radiation was not considered in the development of these ICs because it is assumed that they will be used in ordinary environment. 54 |
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