AT5519
Preliminary Product Information
Dual Full-Bridge Stepper Motor Driver
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: service@aimtron.com.tw
6
Typical Application Information
PWM Current-Control Circuitry
Channel 1 Terminal Number Shown
PWM Current Control
The AT5519 output current is sensed and controlled independently in each bridge by an external sense
resistor (RS), Internal comparator, and monostable multivibrator. When the bridge is turned on, current
increases in the motor winding and it is sensed by the external sense resistor until the sense voltage
(VCOMPIN) reaches the level set at the comparator input:
The comparator then triggers the monostable which turns off the source driver of the bridge. The actual
load current peak will be slightly higher than the trip point because of the internal logic and switching
delays. The delay (td) is typically 2µs. The source driver’s off time is determined by the monostable’s
external RT and CT timing components.
S
REF
TRIP
R
V
I
×
=
10
T
T
off
C
R
t
×
=
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