7560-082197-6

17

15

14

12

10

11

ROTOR

3

1

2

4

24

25

26

S1

S2

S3

20

OUT1

OUT3

OUT4

OUT6

FIGURE 6.

FOUR PHASE FULL WAVE MOTOR CONTROLLER

23

BRAKE

TOP

DRIVER

POLARITY

SELECT

S1

S2,S3

OVERCURRENT

SENSE

(+)

(+)

S1

S2,S3

FIGURE 6. Four phase motor control requires only two Hall Sensor inputs spaced 90 electrical

degrees apart. S1 is connected to one sensor and S2 and S3 are tied together and connected to

the other sensor (Refer to Table 1). The BRAKE input (Pin 23) is used to control the Top Driver

Select (Pin 20) and the Top Motor Drivers. When the BRAKE input is applied, the Top Motor driv-

ers are turned off and the Top Driver Polarity Select is forced low turning on the Outputs 1 and 3.

Since Outputs 4 and 6 are also turned on, the motor windings become shorted together.

The information included herein is believed to be

accurate and reliable. However, LSI Computer Systems,

Inc. assumes no responsibilities for inaccuracies, nor for

any infringements of patent rights of others which may

result from its use.