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OM9369SP Datasheet(PDF) 7 Page - International Rectifier |
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OM9369SP Datasheet(HTML) 7 Page - International Rectifier |
7 / 14 page www.irf.com 7 OM9369 Figure 3 represents the implementation of a typical current-mode controller for torque control. The load current is monitored via the controller’s internal sense resistor. The current sense signal is filtered and fed into the current sense amplifier where the absolute value of ISH-ISL is multiplied by two and biased up by 2.5V. Besides the implementation of the cycle-by- cycle current limit/overcurrent protection feature of the OM9369 discussed in the preceding paragraph, the output of the current sense amplifier is fed into the error amplifier which is configured as a differential amplifier. An error signal representing the difference between the current command input and the value of the amplified current sense signal is produced. Then it is compared to a pulse width modulated ramp and since torque is nearly proportional to the average phase output current, the torque is controlled via duty cycle control. Fig 3: Implementation of a Current-Mode Controller C_BUS + C_FILT 232 232 4700pF .1uF .1uF 10uF + .26uF 43k 1800pF 2k 3.24k 3.24k 1k 35.6k 10k .1uF Vcc 1 VREF 5 OSCILLATOR 10 PWM_IN 9 EA1_OUT 8 EA1+ 4 EA1- 2 SOFT_START 18 I_SENSE 11 ISH 12 ISL 13 QUAD_SEL 14 DIRECTION 24 SPEED_IN 23 EA2_OUT 7 EA2+ 3 EA2- 6 BRAKE 16 TACH_OUT 15 GROUND 19 V_MOTOR 43 PHASE_A_OUT 42 PHASE_A_OUT 41 SOURCE_A 40 SOURCE_A 39 V_MOTOR 38 PHASE_B_OUT 37 PHASE_B_OUT 36 SOURCE_B 35 SOURCE_B 34 V_MOTOR 33 PHASE_C_OUT 32 PHASE_C_OUT 31 30 SOURCE_C 29 MOTOR_RETURN 28 MOTOR_RETURN 27 H1_HALL_INPUT 22 H2_HALL_INPUT 21 H3_HALL_INPUT 20 CSH 25 CSL 26 OV_COAST 17 H3 H2 H1 H3 H2 H1 V_MOTOR +15V CURRENT_COMMAND HALL SENSORS FROM MOTOR HALL SENSORS MOTOR OFFSET SOURCE_C |
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