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| Bipolar Driver IC SI-7230M s Ratings Absolute maximum rating Type No. SI-7230M Supply voltage (V) VCC1 50 VCC2 7 Peak voltage of pins CA and CB (V) VSP 70 Output current (A) Io 3.2 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 Supply voltage Output current *Comparator threshold voltage Excitation signal input voltage Excitation signal input current (mA) IIL max 1.6 min 19 Oscillation frequency VCC2 input current (mA) ICC2 max 150 (V) VCC1 Type No. SI-7230M min 15 typ max min 30 45 4.5 VCC2 IO (mA/o) IOM typ max min VTHF typ max min max min 5 5.5 200 3000 535 (V) VTHPD VIL(ON) typ max min (V) VIH(OFF) VCC2 VCC2 -0.4 +2 typ max min max min max 0 0.5 (kHz) F typ max 21 25 580 625 1.025 1.125 1.225 0.515 0.555 0.595 * VTHF : Conditions shown in the standard external connection diagram with VCC2 = 5V and RS = 1 VTHPD : Conditions shown in the standard external connection diagram with RX = 1k, VCC2 = 5V and RS = 1 s Block diagram Auxiliary power supply VCC2 Reference voltage Comparator amplifiter Main power supply VCC1 Current controller Variable current resistor Rx Trigger pulse generator circuit Excitation signal amplifier M Excitation signal (4-phase) SI-7230M Counter EMF Canceller Current detection resistor RS + CA, CB s Equivalent circuit diagram AIN 7 CA 2 AOAO 4 5 AIN 8 BIN 15 D10 1 VCC1 D9 R1 VCC2 R9 Tngger pulse generator circoit CB 20 BO BO 18 17 BIN 14 R2 Tr1 Tr2 R10 R11 R7 R37 R38 D2 Tr10 R3 Tr3 Tr11 D3 R39 R40 Tr4 R4 10 R12 D4 Tr12 R8 R49 11 VREF R50 R5 Tr9 D1 R6 R25 R13 Tr13 R21 D5 D6 R29 Tr5 Tr6 R26 R14 Tr14 R30 R22 R48 R18 R34 R44 R19 1C1/2 R46 R15 R42 Tr15 R23 R27 R28 D7 D8 R31 Tr7 Tr8 R32 Tr20 R36 Tr16 R24 R20 R16 R43 R41 9 VrefA R47 - + 1C2/2 R45 Tr17 R33 Tr18 Tr19 R35 G 12 13 VrefB 6 3 RSA G 6 19 RSB G 50 SI-7230M s External dimensions (Unit: mm) SI-7230M 69.00.5 63.00.4 Plastic package 7.00.5 3.5 16.6 35.00.5 Type No. Lot No. 8.0 3.4 8.61 1.8 3 3.8 0.5 1.4 P = 2.54 Pin No. 12....................................20 s Standard external connection diagram VCC2 + 22F 10V AIN AIN BIN BIN + 100F 100V VCC1 Excitation signal input Active Low A A B B 7 8 15 14 VCC2 10 VCC1 1 IO AO 4 AO 5 18 BO IO SI-7230M 11 VREF VrefA 9 VrefB 13 10K RX PD (Power down) 2SC2002 RSA RSB G 6 17 2 BO CA + 10F 100V + 10F 100V 20 CB 1612 3 19 * For details on the characteristics and thermal design, refer to the technical manual. 51 SI-7230M Application Note s Determining the output current IO (motor coil current) The output current, IO is fixed by the following elements: RS : Current detection resistor VCC2 : Supply voltage RX : Variable current resistor To operate a motor at maximum current level, set RX to infinity (open). To compute IO when different values are used for RS and VCC2, use the approximation formula below. The maximum ripple value IOH of the output current waveform can be computed as follows: 1 (0.233*VCC2-0.026) [A] IOH(max) = RS 1 (0.214*VCC2-0.021) [A] IOH(min) = RS The graph of the equations above is shown below. s Power down mode SI-7230M can be operated in power down mode. The circuit is shown below. When transistor Tr is switched on, the reference voltage drops and the output current can be decreased. 9 11 13 SI-7230M Tr RX s Surge absorption capacitor CA and CB and capacitance The upper diagram shown on the next page is the flow of the counter EMF produced by the motor coils when it charges CA and CB and the lower diagram shows the direction of the energy discharged by CA and CB. When phase A shown in the figure is off, the counter EMF (energy built-up by the coil inductance) produced by the motor coils passes through the path shown by the dotted lines and charges CA and CB. When phase A is on, the energy stored by the capacitors are discharged in the direction shown by the dotted lines in the lower left diagram on the next page. The capacitors are discharged until the voltage across their pins equal the supply voltage VCC. The peak voltage VSP across the capacitors is given by the equation: VSP = L *IO + VCC C IOH Waveform of the output current SI-7230M Output current IOH vs. Current detection resistor Rs 3 Output current IOH (A) 2 1 (0.233VCC2 - 0.026) RS IOH(min) = 1 (0.214VCC2 - 0.021) RS IOH(max) = 1 where, L : Motor coil inductance between pins 4 and 5 or pins 18 and 17 C : Capacitance of CA and CB IO : Output current 0 0 1 2 3 4 Current detection resistor Rs () SI-7230M Output current IOH vs. Variable current resistor Rx 3 RS = 0.3 An example waveform of VSP is shown in the middle figure on the next page. A VSP that can be obtained when high voltage is applied can also be produced by using the counter EMF when the coil current rises. Notes in selecting CA and CB. (1) VSP must not exceed the breakdown voltage of the hybrid IC (70V). (2) CA and CB are charged/discharged in the same rate as the phase is switched. Hence, a capacitor with excellent anti-ripple characteristics should be selected. Output current IOH (A) 2 RS = 0.6 1 1 IOH(max) = RS IOH(min) = 1 RS 0 0 1.131 4.9 VCC2 - 0.026 4.843 + RX 1.107 51 VCC2 - 0.021 5.165 + RX 1 2 3 4 Variable current resistor Rx (k) 52 SI-7230M Application Note Charging path of the counter EMF VCC CA or CB IOFF A A + - Example VSP waveform 10V/div VCC VSP L A A VCC = 30V IO = 0.7A/ 1-2 phase excitation 950PPS 1 ms/div Discharge path of the counter EMF VCC CA or CB ION A A + - L A A Torque vs. Response frequency Measurement conditions VCC1 = 35V, VCC2 = 5V IO = 2.5A/ 2-phase excitation Motor : 23LM-CO35 (Manufactured by Minevea) Motor connection A B 5 With external capacitor . CA, B =3.3F/100V . Without external capacitor Pins q-w-@0pin shorted Pull-out torque OUT (kg*cm) 4 3 2 1 A 0 100 500 1K 2K 5K 10K X B X X : Open Response frequency f (pps) 53 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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