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| Unipolar Driver ICs SI-7115B s Characteristics Parameter Applied voltage Type No. Vsurge(V) Absolute maximum rating Output current Io(A/o) Junction temperature Tj(C) Electrical characteristics Operating Storage Supply Output Input ambient temperature voltage current current temperature Vcc(V) Io(A) Iin(mA) Top(C) Tstg(C) min typ max min max min max Oscillation frequency Output f (kHz) current min max (A/o) 0.2 SI-7115B 40 1.7 125 -20 to +80 -30 to +100 20 24 30 0.2 1.5 5.0 19 24 0.5 1.0 1.5 (Ta = 25C) Phase switching signal input ON OFF Input Input Input voltage current voltage (V)min (mA)min (V)max 2.7 3.1 3.6 4.5 1.0 1.2 1.4 2.0 0.8 s Block diagram VCC Reference voltage Rx Oscillator circuit Comparator amplifier Current controller M Counter EMF canceller Output current fine adjustment resistor Excitation signal (4-phase) Current detection resistor Excitation signal amplifier SI-7115B s Equivalent circuit diagram 18 Q1 6 9 7 10 8 Q3 RS1 11 1 + - + - s External connection diagram Q2 D5 D1 D2 D6 17 14 16 13 15 Q4 Q5 Q6 RS2 12 VCC D4 D3 18 Excitation signal input Active High A B A B 8 13 10 15 1 + - Rx b a 2 4 5 3 11 12 17 6 Stepper motor F 2.2 10V SI-7115B 7 9 14 16 A A B B 4 Oscillator circuit 5 2 3 33 SI-7115B s External dimensions Plastic package Dimensions of SI-7115B pins 71.70.5 60.30.4 11.51 39.60.5 0.4 4.0 4 Type No. Lot No. 9.00.6 (Unit: mm) 3.4 8.0 Aluminum plate 11.51 0.5 P=2.54 43.2 123 18 Application Note s Determining the output current Io (motor coil current) The output current Io can be set to any value by connecting an external resistor RX across pin 3 and all of pins 2, 4 and 5. Fig. A, B and C show the relationship between the external resistor and the output current, the supply voltage and the output current, and the output current and the temperature, respectively. Output current IO Output current IO 0.31 to 0.39 (A/o) 0.95 to 1.05 (A/o) RX 200 () 1.4 (k) Condition VCC = 24V, Ta = 25C 2-phase excitation Holding mode Motor: 23PM-C109 Fig. A SI-7115B External resistor vs. Output current 1.5 Output current IO (A/ ) 1.0 0.5 VCC 24(V) Rt 3.6() Motor : 23PM-C109 0 0 3 4 External resistor Rx (k) Fig. B SI-711B Supply voltage vs. Output current Fig. C SI-7511B Output current vs. Temperature 1.5 Motor : 103G-775-1240 VCC = 24V 1.5 Motor : 23PM-C109 Rx 3.9k Output current IO (A/ ) 2k Output current IO (A/ ) RX = 1.4k 1.0 1.0 1k RX = 560 600 0.5 300 0.5 100 0 0 20 22 24 26 28 30 0 0 20 40 60 80 100 Supply voltage VCC (V) Case (aluminium base plate) temperature Tc (C) 34 SI-7115B Application Note s Power down mode The SI-7115B can be operated in power down mode. The circuit is shown below. As shown in the figure, Power down circuit when the power down tran2 sistor is switched on, (Ry 4 is power down resistor) RY RX/RY becomes a current 5 fixing resistance and the RX SI-7115B current during power down mode can be obtained by 3 substituting this resistance to RX in the previous Fig. Power down Transistor TR A. s Thermal design In SI-7115B, the avalanche diode of the phase-switching transistor is operated in breakdown condition and the energy built up in the inductance of the motor coil is dissipated as heat of the transistor. Hence, when the motor rotates, the internal heat dissipation increases compared with when the motor is stopped. Therefore, the internal heat dissipation of 7115B can be computed from the data taken with actual load through the following procedures. (1) Vary the rotation speed of the motor within the actual operating range in a circuit under actual load conditions and measure the supply current ICC and the corresponding output current IO1 and IO2. Method for measuring current (circuit under actual load conditions) VCC A 15 Excitation signals A B A B 8 13 10 15 1 has e ex cita tion s Example of Frequency vs. Torque characteristics The following two graphs show the relationship between frequency (pps) and pull-out torque (kg - cm) of SI-7115B when used with two types of motor. ICC IO1 A A IO2 Stepper motor 17 6 SI-7115B 2.0 Torque characteristics 2-p SI-7115B 7 9 14 16 12 A A B B 1-2 phase excitation Pull-out torque (kg-cm) F 2.2 10V + - Rx a 2 4 5 3 11 b 1.0 Motor 103G-775-1240 VCC=24V IO = 1.0A/ 0 50 100 500 1000 5000 (2) Obtain the internal power dissipation Pdiss (4-phase) of 7115B through the following formula. Pdiss = VCC*ICC - (IO12 + IO22)*RL The figure below shows the relationship between frequency (PPS) and ICC, Pdiss, and case temperature TC. SI-7115B Frequency vs. Supply current, Internal power dissipation and Case temperature (Example) Frequency (PPS) SI-7115B 5.0 Torque characteristics 2-phase excitation Pull-out torque (kg-cm) 4.0 2p 1s ha 2 20 100 ICC ICC Supply current A Pdiss = VCC * ICC VCC 2 + IO22) -RL (IO1 TC Temperature of heatsink adjacent to SI-7115B A SI 7115B I01 M A I02 Motor : 23 PM-C109 no load VCC = 24V IO = 1.0A/ 2-phase excitation Heatsink 100 x 100 x 2A Ta = 25C ABAB TC (C) ICC (A) PD (W) 3.0 TC Pdiss ee ita xc tio n 2.0 Supply current Internal heat dissipation 1.0 Motor KP6M2-001 VCC=24V IO = 1.0A/ Case temperature 1 10 50 max ICC 0 50 100 500 1000 5000 0 0 0 0 500 1000 1500 Frequency (PPS) Frequency (PPS) 35 SI-7115B Application Note SI-7115B Derating curve 28 (3) Obtain the heatsink area corresponding to the ambient temperature Ta from the derating curve. (4) Verify that the temperature of the aluminum base plate of 7115B or adjacent heatsinks is below 85C (equivalent to max. ambient temperature) when operating under actual load conditions. Internal power dissipation PD (W) (2-phase) 24 SI-7115B Aluminum heatsink Using silicone grease Unit : mm 10 20 0x 20 0x 2( 3.4 10 16 0x C 15 ) /W 0x 2 (3 10 12 .75 0x 1 C /W 00 x2 ) (4. 7C /W ) 8 4 No he atsink 0 0 20 40 60 80 Ambient temperature Ta (C) 36 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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