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STK672-120-SL-E Scheda tecnica(PDF) 5 Page - ON Semiconductor |
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STK672-120-SL-E Scheda tecnica(HTML) 5 Page - ON Semiconductor |
5 / 11 page STK672-120-SL-E No. A2140-5/11 Precautions • To minimize noise in the 5V system, locate the ground side of capacitor CO2 in the above circuit as close as possibleto pin 1 of the IC. • Insert resistor RO3 (47 to 100Ω) so that the discharge energy from capacitor CO4 is not directly applied to the CMOS-IC in this hybrid device. If the diode D1 has Vf characteristics with Vf less than or equal to 0.6V (when If = 0.1A), this will be smaller than the CMOS IC input pin diode Vf. If this is the case RO3 may be replaced with a short without problem. • Standard or HC type input levels are used for the pin 7, 8, and 9 inputs. • If open-collector type circuits are used for the pin 7, 8, and 9 inputs, these circuit will be in the high-impedance state for high level inputs. As a result, chopping circuit noise may cause the input circuits to operate incorrectly. To prevent incorrect operation due to such noise, capacitors with values between 470 and 1000pF must be connected between pins 7 and 11, 8 and 11, and 9 and 11. (A capacitor with a value between 470 and 1000pF must be connected between pins 6 and 11 as well if an open-collector output IC is used for the RESETB pin (pin 6) input.) • Taking the input bias current (IIB) characteristics into account, the resistor RO1 must not exceed 100kΩ. • The following circuit (for a lowered current of over 0.2A) is recommended if the application needs to temporarily lower the motor current. Here, a value of close to 100k Ω must be used for resistor RO1 to make the transistor output saturation voltage as low as possible. Input Pin Functions (CMOS input levels) Pin Pin No. Function Input conditions when operating CLOCK 9 Reference clock for motor phase current switching Operates on the rising edge of the signal MODE 8 Excitation mode selection Low: 2-phase excitation High: 1-2 phase excitation CWB 7 Motor direction switching Low: CW (forward) High: CCW (reverse) RESETB 6 System reset and A, AB, B, and BB outputs cutoff. Applications must apply a reset signal for at least 20 μs when power is first applied. A reset is applied by a low level (1) A simple reset function is formed from D1, CO4, and RO3 in this application circuit. With the CLOCK input held low, when the 5V supply voltage is brought up a reset is applied if the motor output phases A and BB are driven. If the 5V supply voltage rise time is slow (over 50ms), the motor output phases A and BB may not be driven. Increase the value of the capacitor CO4 and check circuit operation again. (2) See the timing chart for the concrete details on circuit operation. 5V RO1 RO2 R3 5V RO1 RO2 R3 Vref Vref |
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