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LS7362 Datasheet(PDF) 5 Page - LSI Computer Systems |
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LS7362 Datasheet(HTML) 5 Page - LSI Computer Systems |
5 / 6 page Vss - + 13 V TRIP EXT. OSCILLATOR R6 R2 C1 S1 R1 15 Vss C3 Vss R3 R4 R5 D1 C2 Vss R8 LS7362 FROM MOTOR POSITION SENSOR 14 C4 R7 FIGURE 5 CLOSED-LOOP SPEED CONTROLLER A closed loop system can be configured by differentiating one of the motor position sense inputs and integrating only the negative pulses to form a DC voltage that is applied to the inverting input of an op-amp. The non-inverting input voltage is adjusted with a potentiometer until the resultant voltage at V TRIP causes the motor to run at desired speed. The R2-C1 differentiator, the R3-D1 negative pulse trans- mitter and the R4-C2 integrator form a frequency to voltage converter. An increase in motor speed above the desired speed causes V TRIP to increase which lowers the duty cy- cle modulation of the oscillator and the resultant motor speed. A decrease in speed lowers V TRIP and raises the duty cycle modulation and the resultant motor speed. For proper operation, both R5 and R6 should be greater than R4, and R4 in turn should be greater than both R2 and R3. Also the R4-C2 time constant should be greater than the R2-C1 time constant. C3 may be added across R6 for additional V TRIP smoothing. BRAKE MOTOR SUPPLY Vss O6 8 5 COMMON BRAKE INPUT 7 O4 6 9 O5 LS7362 FIGURE 3. SINGLE-ENDED DRIVER CIRCUIT This configuration requires only one base current limiting resistor connected from the COMMON pin to Vss. FORWARD REVERSE IN914 2.2K Inputs form SG1731 or UC1637 F/R LS7362 ENABLE 19 10 FIGURE 4. PRECISION CONTROL BRUSHLESS DC MOTOR DRIVE For controlled acceleration and deceleration of motors in the forward or reverse directions, a motor control pulse width modulator circuit such as the SG1731 or UC1637 can be interfaced with the LS7362. The logical OR gate made up of the resistor-diode net- work permits the LS7362 to be enabled when either the forward or reverse input is high. By applying the forward input directly to Pin 19, the motor can only operate in the forward direction when the forward input is high and only in the reverse direction when the reverse input is high. Motor direction is determined by relative pulse widths of the forward and reverse inputs while acceleration or deceleration is determined by variations of these widths. The information included herein is believed to be accurate and reliable. However, LSI Computer Systems, Inc. assumes no responsibilities for inaccuracies, nor for any infringements of patent rights of others which may result from its use. 7362-101992-5 |
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