OM9373SF 查看數據表（PDF） - International Rectifier

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产品描述 (功能)

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OM9373SF

FULL-FEATURED POWER MODULE FOR DIRECT DRIVE OF 3-PHASE BRUSHLESS DC MOTOR

International Rectifier 

OM9373

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

OM9373 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 controlled

via duty cycle control.

Fig 3: Implementation of a Current-Mode Controller

CURRENT_COMMAND

+15V

3.24k

1k

OFFSET

35.6k

10uF +

.1uF

1800pF

3.24k

.26uF

2k

FROM MOTOR HALL SENSORS

H3

H2

H1

43k

.1uF

10k

.1uF

4700pF

232

232

1

2 Vcc

3 EA1-

4 EA2+

5 EA1+

6 VREF

EA2-

7

8 EA2_OUT

9 EA1_OUT

10 PWM_IN

OSCILLATOR

11

12 I_SENSE

13 ISH

14 ISL

QUAD_SEL

15

16 TACH_OUT

17 BRAKE

18 OV_COAST

SOFT_START

19

20 GROUND

21 H3_HALL_INPUT

22 H2_HALL_INPUT

23 H1_HALL_INPUT

SPEED_IN

24

25 DIRECTION

26 CSH

CSL

43

V_MOTOR

42

PHASE_A_OUT 41

PHASE_A_OUT

40

SOURCE_A

39

SOURCE_A

38

V_MOTOR

37

PHASE_B_OUT 36

PHASE_B_OUT

35

SOURCE_B

34

SOURCE_B

33

V_MOTOR

32

PHASE_C_OUT 31

PHASE_C_OUT

30

N/C 29

SOURCE_C

28

MOTOR_RETURN 27

MOTOR_RETURN

V_MOTOR

C_BUS

+

C_FILT

MOTOR

H1

H2

H3

HALL SENSORS

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