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STK673-010-E Arkusz danych(PDF) 5 Page - ON Semiconductor |
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STK673-010-E Arkusz danych(HTML) 5 Page - ON Semiconductor |
5 / 15 page STK673-010-E No.5708-5/15 Set Equation of Output Current IO Peak Value IO peak = Vref ÷ K K = 0.63 (V/A) where Vref ≤ 0.5 × VCC2 Vref = VCC2 × Rox ÷ (R01 + Rox) Rox = (R02 × 4.0kΩ) ÷ (R02 + 4.0kΩ) • R02 is preferably set to be 100Ω in order to minimize the effect of the internal impedance (4.0kΩ ±30%) of STK673-010-E • For noise reduction in 5V system, put the GND side of bypass capacitor (220μF) of VCC1 (shown in a thick line in the above Sample Application Circuit) in the vicinity of pins 27 and 28 of the hybrid IC. • Set the capacitance value of the bypass capacitor C1 such that a ripple current of a capacitance, which varies in accordance with the increase of motor current, lies in an allowable range. • K in the above-mentioned set equation varies within ±5 to ±10% depending on the inductance L and resistance value R of the used motor. Check the peak value setting of IO upon actual setting. Input/Output Terminals Functions of 5V System Terminal name No. Function Conditions upon Functioning 0 = Low, 1 = High Clock 11 Basic clock for switching phase current of motor Input frequency range: DC to 50kHz Minimum pulse width: 10 μs High level duty: 40 to 60% Rising edge in Mode C = 1 Rising and falling edge in Mode C = 0 Mode A 12 Sets excitation mode See table listed below Mode B 13 Sets excitation mode See table listed below Mode C 18 Sets excitation mode See table listed below TU 22 Sets excitation mode Switches 2-3 phase excitation of step current to rectangular current More effective in increasing torque than in lowering vibration of motor See table listed below Hold 14 Temporarily holds the motor in a state 0 CW/CCW 15 Switches the rotational direction of the motor 1 = CW, 0 = CCW Enable 16 Turns OFF all of the driving MOSFET 0 Reset 17 System reset Make sure to input a reset signal of 10 μs or more 0 MOI 20 Monitors the number of revolution of the motor Outputs 1 pulse of a high level signal per one cycle of phase current Vref 10 Sets the peak value of the motor current set at 0.63V per 1A Maximum value 0.5 × VCC2 (4A max) Excitation Mode Table Input condition Mode A Mode B Mode C TU Excitation No. Excitation Mode Number of current steps Number of clock pulse per one cycle of phase current 0 0 1 1 (1) 2-phase 1 6 0 1 1 1 (2) 2-3-phase 3 12 0 1 1 0 (3) 2-3-phase TU 1 12 1 0 1 1 (4) W2-3-phase 6 24 1 1 1 1 (5) 2W2-3-phase 12 48 0 0 0 1 (6) 2-3-phase 3 6 0 0 0 0 (7) 2-3-phase TU 1 6 0 1 0 1 (8) W2-3-phase 6 12 1 0 0 1 (9) 2W2-3-phase 12 24 As shown in the table, TU terminal is only effective for Excitation Nos. (3) and (7). Although the present hybrid IC is not damaged even when TU = 0 is mistakenly input in Excitation, other than Excitation Nos. (3) and (7), motor vibration or motor current may increase. * Timing charts for 3-phase stepping motor driver is illustrated on pages 9 to 13 for exemplary operations of Enable Hold, CW/CCW for Excitation Nos. (1), (2), (3), (4), (5) and (9), and Excitation No. (4). |
Podobny numer części - STK673-010-E |
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Podobny opis - STK673-010-E |
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