20
LTC1045
1045fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
LINEAR TECHNOLOGY CORPORATION 1988
TYPICAL APPLICATION
U
Power MOSFET Driver Low Power Consumption Stepper Motor Driver
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LT1016 Ultrafast Precision Comparator 10ns Propagation Delay
LT1039 Triple RS232 Driver/Receiver with Shutdown ±12V Supply, No Supply Current in Shutdown
LTC1440/LTC1441/LTC1442 Ultralow Power, Single/Dual Comparator with Reference 2.8µA Supply Current
OUT1
OUT2
OUT3
OUT4
OUT5
OUT6
IN1
IN2
IN3
IN4
IN5
IN6
V
TRIP2
V
TRIP1
V
–
19
18
17
16
15
14
2
3
4
5
6
7
8
9
1045 TA17
LTC1045
13
12
11
20
10
1
+V
M
DIS
I
SET
V
OL
V
OH
V
+
1k
0.1µF
≈ 1.4V
≈ 0.2V
4-PHASE BIFILAR
STEPPER MOTOR
TTL STEPPER
MOTOR PHASE
SIGNALS
∅1
∅1
∅2
∅2
R
H
STEP
CLOCK
C
5V
**
**
**
** ** **
MOTOR GND
t
ON
A
t
HOLD
A
B
B
FULL STEP DRIVER (5V ≤ V
M
≤ 15V)
t
ON
≈ 3R
P
C
RpC = L/R L IS WINDING INDUCTANCE
R = R
WINDING
+ R
DS(ON)
P + R
DS(ON)
N
I
HOLD
≈ V
M
/R
H
*VARISTOR GE V24ZA50
**FOR V
M
≥ 10V ADD 470Ω IN SERIES
WITH LTC1045 OUTPUTS
R
P
20k
51k
BUZ171
BUZ71A
BUZ71A
BUZ71A BUZ71A
+
–
+
–
+
–
+
–
+
–
+
–
LT/LCG 1101 REV C 1.5K • PRINTED IN USA
