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OM9369 Datasheet(PDF) 6 Page - International Rectifier |
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OM9369 Datasheet(HTML) 6 Page - International Rectifier |
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6 / 14 page  OM9369 6 www.irf.com Modes of Operation Figures 2 and 3, shown on the following pages, provides schematic representations of typical voltage- mode and current -mode applications for the OM9369 controller/driver. Figure 2 represents the implemenation of a typical voltage-mode controller for velocity control. A voltage or speed command is applied to the noninverting input of the error amplifier which is configured as voltage follower. The ouput of the error amplifier is compared to a pulse width modulated ramp, and since motor speed is nearly proportional to the average phase output voltage, the average speed is controlled via duty cycle control. If a speed feedback loop is required, the tachometer output can be connected to the inverting input of the error amplifier via a loop compensation network. Fig 2: Implementation of a Voltage -Mode Controller Figure 2 also shows the implementation of the cycle-by-cycle current limit/overcurrent protection feature of the OM9369. 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. The output of the current sensor amplifier is compared to a fixed reference, thus providing cycle- by-cycle current limiting and/or overcurrent protection as necessary. The typical peak current threshold (ISL-ISH) is 0.2V; the typical over current threshold (ISH-ISL) is 0.3V. C_FILT 232 232 4700pF .1uF 3.24k 1.50k 1k .1uF C_BUS + 10uF + .1uF 10k 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 COMMAND +15V HALL SENSORS FROM MOTOR HALL SENSORS MOTOR SOURCE_C |
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