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SLA7032 데이터시트(PDF) 4 Page - Sanken electric |
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SLA7032 데이터시트(HTML) 4 Page - Sanken electric |
4 / 8 page 31 SLA7032M/SLA7033M SLA7032M/SLA7033M 2-Phase Stepper Motor Unipolar Driver IC (2-Phase/1-2 Phase Excitation) sOutline SLA7032M (SLA7033M) is a stepper motor driver IC developed to reduce the number of external parts required by the conven- tional SLA7024M (SLA7026M). This IC successfully eliminates the need for some external parts without sacrificing the features of SLA7024M (SLA7026M). The basic function pins are com- patible with those of SLA7024M (SLA7026M). sNotes on Replacing SLA7024M (SLA7026M) SLA7032M (SLA7033M) is pin-compatible with SLA7024M (SLA7026M). When using the IC on an existing board, the fol- lowing preparations are necessary: (1) Remove the resistors and capacitors attached for setting the chopping OFF time. (r3, r4, C1, and C2 in the catalog) (2) Remove the resistors and capacitors attached for preventing noise in the detection voltage VRS from causing malfunction- ing and short the sections from which the resistors were re- moved using jumper wires. (r5, r6, C3, and C4 in the catalog) (3) Normally, keep pins 2 and 13 grounded because their func- tions have changed to synchronous and asynchronous switching (SYNC terminals). For details, see "Circuit for Pre- venting Abnormal Noise When the Motor Is Not Running (Syn- chronous circuit)." (Low: asynchronous, High: synchronous) sCircuit for Preventing Abnormal Noise When the Motor Is Not Running (Synchronous Circuit) A motor may generate abnormal noise when it is not running. This phenomenon is attributable to asynchronous chopping between phases A and B. To prevent the phenomenon, SLA7032M (SLA7033M) contains a synchronous chopping circuit. Do not leave Synchronous circuit operating waveform SYNC_A SYNC voltage : Low SYNC voltage : High → Chopping asynchronous → Chopping synchronous TTL, etc. SYNC_B SLA7032M SLA7033M Sync/async switching signal To comparator (high impedance) REF_A R1 R2 3 5V REF_B VREF VREF waveform VREF 0 14 SLA7032M SLA7033M FET A/A gate drive signal 40 Ω (typ.) 40 Ω (typ.) FET B/B gate drive signal ONE SHOT (tw=2 S) µ ONE SHOT (tw=2 S) µ VREF VRS Phase A 0 VREF VRS Synchronous circuit ON Synchronous circuit OFF Phase B 0 Application Notes the SYNC terminals open because they are for CMOS input. Connect TTL or similar to the SYNC terminals and switch the SYNC terminal level high or low. When the motor is not running, set the TTL signal high (SYNC terminal voltage: 4 V or more) to make chopping synchronous. When the motor is running, set the TTL signal low (SYNC terminal voltage: 0.8 V or less) to make chopping asynchronous. If chop- ping is set to synchronous at when the motor is running, the motor torque deteriorates before the coil current reaches the set value. If no abnormal noise occurs when the motor is not running, ground the SYNC terminals (TTL not necessary). The built-in synchronous chopping circuit superimposes a trigger signal on the REF terminal for synchronization between the two phases. The figure below shows the internal circuit of the REF terminal. Since the ∆VREF varies depending on the values of R1 and R2, determine these values for when the motor is not run- ning within the range where the two phases are synchronized. |
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