Datasheet

LT1970
23
1970fc
APPLICATIONS INFORMATION
Figure 14. Simple Bidirectional DC Motor Speed Controller Without a Tachometer
VC
SRC
COM
V
EE
VC
SNK
V
–
FILTER
V
+
FAULT/STALL
R3
2k
12V
EN
V
CC
ISNK
ISRC
SENSE
–
SENSE
+
TSD
OUT
+IN
LT1970
–12V
12V
–12V
12V
12V
–12V
–IN
R
S
1Ω
12V DC
MOTOR
1970 F14
C1
4.7µF
R15
100Ω
C2
0.01µF
SHDN
R14
10k
OV TO 5V
TORQUE/STALL
CURRENT CONTROL
R2
20k
R1
10k
R4
100k
R5
120k
R7
10k
R6
49.9k
R12
10k
R13
10k
R8
20k
R9
20k
R10
82.5k
C3
0.1µF
D1
1N4148
D2
1N4148
–12V
R11
9.09k
–
+
–
+
–
+
1/2 LT1638
1/2 LT1638
LT1782
5V
0V
MOTOR SPEED
CONTROL
REV
FWD
STOP