LS7561 datasheet(7/8 Pages) LSI

7 / 8 page

V M

OUT1

OUT3

OUT4

OUT6

V R

FIGURE 7. FOUR PHASE HALFWAVE MOTOR CONTROLLER

ENABLE

TOP DRIVER

POLARITY

SELECT

BRAKE

(+)

(-)

OVERCURRENT

SENSE

BRAKE

SELECT

BRAKE

TACH OUT

OUT

V R

(-)

(+)

ERROR

AMP

100K

SPEED

CONTROL

PWM RATE

CONTROL

FIGURE 8. PWM BRAKING

0.1µF

V R

BRAKE

TYPICAL

VALUES

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.

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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