LS7560 데이터 시트보기 (PDF) - LSI Corporation

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LS7560

BRUSHLESS DC MOTOR CONTROLLER

LSI Corporation  

19

VR

O U T 1 17

2 ENABLE

15

OUT3

VM

20 TOP DRIVER

POLARITY

SELECT

14

OUT4

23

12

BRAKE OUT6

(+) 10

OVERCURRENT

SENSE

(-) 11

FIGURE 7. FOUR PHASE HALFWAVE MOTOR CONTROLLER

FIGURE 7. This four phase half wave motor controller uses the same BRAKE circuit as in Figure 4 and switches

the Top Driver Select from a high to a low as in Figure 6.

VR

BRAKE

* TYPICAL

VALUES

BRAKE

22 BRAKE

SELECT

TACH OUT 5

23

BRAKE

7

(-)

8

ERROR OUT

AMP

6

(+)

100K

BRAKE

*R2

BRAKE

*R1

1M

*C1

0.1µF

BRAKE

BRAKE

VR

BRAKE

BRAKE

BRAKE

BRAKE

VR

FIGURE 8. PWM BRAKING

SPEED

CONTROL

PWM RATE

CONTROL

FIGURE 8. Using an analog switch (such as the CD4066) PWM braking can be employed when the brake is

applied. At that time, the error amplifier is configured as a voltage follower and its input is switched from the

speed adjustment control to the PWM rate control. By adjusting the PWM rate control, the average motor

current during braking can be controlled.

7560-040198-7

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