전자부품 데이터시트 검색엔진 |
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CS3717A 데이터시트(PDF) 5 Page - ON Semiconductor |
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CS3717A 데이터시트(HTML) 5 Page - ON Semiconductor |
5 / 8 page 5 For rotation in the other direction the sequence must be reversed. The torque of each step is constant in full step operation. Half step operation Power is applied alternately to one winding then both according to the sequence: AB →B→ B→→ → →A →A etc. Like full step this can be done at any current level; the torque is not constant but is lower when only one wind- ing is energized. A coil is turned off by setting IN0 and IN1 both high. Quarter step operation It is preferable to realize the quarter step operation at full power otherwise the steps will be of very irregular size. B B AB A A The extra quarter steps are added to the half step sequence by putting one coil on half current according to the sequence. AB → B→B→ B→ B→→ etc. Motor selection As the CS3717A provides constant current drive with a switching operation, care must be taken to select stepper motors with low hysteresis losses to prevent motor over- heating. L-C filter To reduce EMI and chopping losses in the motor, a low pass L-C filter can be inserted across the outputs of the CS3717A as shown in the following diagram. A B 2 A A A 2 A 2 IN0A FULL STEP MOTOR DRIVE 1M = 500mA HALF STEP MOTOR DRIVE 1M = 250mA STAND BY WITH HOLDING TORQUE 1M = 80mA IN1A DIRECTIONA DIRECTIONB IN0B IN1B 500 mA IMA 500 mA IMB - 500 mA - 500 mA 12345678 IN OUT Input and Output Sequences for Half Step and Full Step Operation L ≅ L M 1 10 C ≅ 4 • 10 10 L C OUTA CS3717A OUTB L MOTOR WINDING (LM, RM) Application Information: continued |
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