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SLA7080MPR 数据表(PDF) 7 Page - Sanken electric |
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SLA7080MPR 数据表(HTML) 7 Page - Sanken electric |
7 / 18 page 7 SANKEN ELECTRIC CO., LTD. 28610.23, Rev. 1 Unipolar 2-Phase Stepping Motor Driver ICs SLA7080M Series occurs when the short blanking time is selected, the problem may be eased by the selection of the longer blanking time. A comparison of these trade-offs is provided in the following table (comparisons assume that operating conditions other than the SLA7080M, such as motors, motor power supply voltage, REF input voltages and so forth, as well as circuit constants, are identical in each case). Parameter Better Performance Internal Blanking Set Time Short or Long Minimize PWM On-time (minimum) Short Maximize Ringing Noise Suppression Long Minimize Coil Current Short Synchronous Control The SLA7080M series has a chopping synchronous function to prevent noise which may occasionally be generated during the motor Hold state. This function can be operated by setting the SYNC pin to logic high, which generates a timing signal to synchronize the chopping of the A and B phases. (This function operates identically to that of the SLA7070M.) This function should be used only during self-excitation PWM control. The use of synchronous control during normal stepping motor rotation is not recommended because it produces less motor torque or may cause motor vibration because the control current does not stabilize. Protection Circuit A built-in protection circuit detects against motor coil opens and shorts. Operation of the protection circuit disables all of the out- puts, and sets the FLAG pin. To leave protection mode and return to normal operation, cycle the logic power supply, VDD. Protection is activated by sensing voltage on the internal sensing resistors, RS. Overcurrent that flows without passing the sense resistors cannot be detected. Therefore, this does not detect an overcurrent condition resulting from the OUT pins or SENSE pins shorting to GND. Protection against motor coil opens is available only during PWM operation. Therefore, it does not work during constant volt- age driving, when the motor is rotating at high speed. Motor Coil Short Circuit Protection (Load Short Circuit) This function operates by detecting voltage VRS on the internal sense resistors in the same manner as the current control function. The threshold voltage, VOCP, is set to 0.7 V typical. When VRS ITRIP 5 μs/div I TRIP 500 ns/div 20 μs/div Figure 3. PWM waveform exhibiting seeking behavior Figure 2. Ringing on PWM waveform while driving a motor. The circled area in panel A is expanded in time and shown in panel B. (A) (B) |
类似零件编号 - SLA7080MPR |
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类似说明 - SLA7080MPR |
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