LV8731V
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26
• DC Motor Driver Circuit
(DM = High, and the current limit function is in use)
MD2/DC12
MD1/DC11
DM
OE
ST
VREF
GND
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
Figure 21.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
OUT1A
OUT1A
PGND
NC
NC
VM1
VM1
RF1
RF1
OUT1B
OUT1B
OUT2A
OUT2A
RF2
RF2
VM2
VM2
NC
NC
PGND
OUT2B
OUT2B
VG
VM
CP2
CP1
VREG5
ATT2
ATT1
EMO
CEM
EMM
CHOP
MONI
RST/BLK
STEP/DC22
FR/DC21
0.1 F
0.1 F
0.1 F
47 k
47 k
100 pF
200 pF
1.5 V
Logic Input
Clock Input
Channel 2 position
detection monitor
0.22
0.22
10 F
24 V
LV8731V
M
M
Channel 1short−circuit
state detection monitor
The formulae for setting the constants in the examples of
the application circuits above are as follows :
Constant current limit (100%) setting
When VREF = 1.5 V
Ilimit = VREF / 5 / RF resistance
= 1.5 V / 5 / 0.22 Ω = 1.36 A
Chopping frequency setting
Fchop = Ichop / (Cchop × Vtchop × 2)
= 10 μA/ (200 pF × 0.5 V × 2) = 50 kHz
Timer latch time when the output is short−circuited
Tcem = Ccem × Vtcem /Icem
= 100 pF × 1 V / 10 μA = 10 μs
ORDERING INFORMATION
Device Package Shipping†
LV8731V−TLM−H SSOP44K (275 mil)
(Pb−Free / Halogen Free)
2000 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
