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參數資料
型號: L9942XP1TR
廠商: STMICROELECTRONICS
元件分類: 運動控制電子
英文描述: STEPPER MOTOR CONTROLLER, 2.5 A, PDSO24
封裝: ROHS COMPLIANT, SSOP-24
文件頁數: 5/40頁
文件大小: 639K
代理商: L9942XP1TR
L9942
Device description
Doc ID 11778 Rev 6
2.13
Decay modes
Figure 4.
Decay modes
A
SLOW
DECAY
Internal PWM_CLK
ON
B
Load
Current
Detail A: SWITCH ON AND SLOW DECAY
Step
Limit
HS
Detail B:
MIXED DECAY
T
When limit is reached so fast decay duration time is set by DM1 DM2 register0
TFT
Filter time for the purpose of switch off delay in on mode is set by FT register6
TCC
T FT
DM2 DM1 DM0
MODE
0
register0
Time
slow
DM2 DM1 DM0 MODE CURVE
X
0
1
register0
X
1
0
X
1
MD1
T
MD2
T
mc
T
Cross current protection time is set by SR1 SR0 register0
MD1
Filter time for purpose of delay when decay mode has to change after limit under-run
CC
T
TCC
T
VS
on
VS
on
VS
on
MDx=
mc
T
CC
+ 2T
= T FT
T
MD
TFT
VS
on
VS
on
SLOW DECAY
MD2
or T
Fast decay is caused by
current through internal
diodes during cross current
protection time.
VS
OFF
ON
OFF
FAST
DECAY
MIXED
DECAY
TMDx
Time
CC
T
SLOW DECAY
with delay
Load
Current
Load
Current
Step
Limit
LS
Time
TFT
CC
T
SLOW DECAY
after current
undershoot
mc
T
Load
Current
FAST
DECAY
CC
T
CC
T
>
TB
Blank time of load current comparator
FAST
DECAY
T
BCC
=T
fa
st
de
ca
y
fa
st
d
e
ca
y
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