AM3933

Motor Driver ICs

http://www.amtek-semi.com

2

Specifications subject to change without notice

- 5 -

This IC detect the rotation of the motor by hall signal, and adjust lock detection ON time (Ton) and

lock detection OFF time (Toff) by the internal counter. These time (Ton, Toff) are showed below.

Fig.3 Lock detect and auto restart motion

Only in Lock detection ON Time (Ton), motor will be rest ordinary motion by switching over of hall

signal.

This IC make the lock protection function off, when the PWM input keeps low level for more than

70ms (typ.)

Fig.4 PWM input signal and lock protect function

Lock protect function does not work if PWM input frequency is slower than 15Hz (typ.)

So, please input faster frequency more than 20Hz

H+

OUT1

OUT2

FG

TON

TOFF

Motor

lock

Detect

lock

Reset ordinary

motion

70ms(typ)

PWM

Lock protect

enable (internal)

enable

disable

enable