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ML4411 Datasheet(PDF) 7 Page - Micro Linear Corporation |
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ML4411 Datasheet(HTML) 7 Page - Micro Linear Corporation |
7 / 14 page 7 ML4411/ML4411A OUTPUTS INPUT STATE N1 N2 N3 P1 P2 P3 SAMPLING R OR 0 OFF ON OFF ON OFF ON N/A A OFF OFF ON ON OFF OFF PH2 B OFF OFF ON OFF ON OFF PH1 C ON OFF OFF OFF ON OFF PH3 D ON OFF OFF OFF OFF ON PH2 E OFF ON OFF OFF OFF ON PH1 F OFF ON OFF ON OFF OFF PH3 Table 1. Commutation States. R RESET 0A B C D E F A 4.3 V CVCO 2.3 V VCO OUT STATE Figure 5. Commutation Timing and Sequencing. ADJUSTING OPEN LOOP STEP RATE IRAMP should be set so that the VCO’s frequency ramp during “open loop stepping” phase of motor starting is less than the motor’s acceleration rate. In other words, the motor must be able to keep up with the VCO’s ramp rate in open loop stepping mode. The VCO’s input voltage (VPIN 20) ramp rate is given by: dV dt I CC VCO RAMP ≈ + 12 since FK V VCO VCO VCO =× K C VCO MAX VCO () = × − 410 6 then combining the 3 equations IRAMP can be calculated from the desired maximum open loop stepping rate the motor can follow. I dF dt CC C RAMP VCO VCO < ×+ × − () 12 6 410 Step 1a: The IC is held in reset (state R) with ICMD low and DIS PWR low. The Micro Processor monitors the VCO/ TACH OUT pin to determine if a signal is present. If a signal is present, the frequency is determined (by measuring the period). If a signal is not present, proceed to the routine described above for starting a motor which is a rest. Step 2a: Release RESET and DIS PWR. Apply a current to pin 21 and monitor the VCO/TACH OUT pin for VCO frequency. Step 3a: When the VCO frequency approaches 6 X the motor frequency (or where the motor frequency has decelerated to by coasting during the time the VCO frequency was ramping up) the back EMF loop can be closed by pulling pin 18 high and motor current brought up with ICMD or ILIMIT. |
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Descripción similar - ML4411 |
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