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參數(shù)資料
| 型號： | L6208PD |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | FULLY INTEGRATED STEPPER MOTOR DRIVER |
| 中文描述： | 完全集成的步進(jìn)電機(jī)驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 13/27頁 |
| 文件大?。?/td> | 453K |
| 代理商： | L6208PD |
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13/27
L6208
t
RCRISE
= 600 · C
OFF
Figure 13 shows the lower limit for the on time t
ON
for having a good PWM current regulation capacity. It has to
be said that t
ON
is always bigger than t
ON(MIN)
because the device imposes this condition, but it can be smaller
than t
RCRISE
- t
DT
. In this last case the device continues to work but the off time t
OFF
is not more constant.
So, small C
OFF
value gives more flexibility for the applications (allows smaller on time and, therefore, higher
switching frequency), but, the smaller is the value for C
OFF
, the more influential will be the noises on the circuit
performance.
Figure 12. t
OFF
versus C
OFF
and R
OFF
Figure 13. Area where t
ON
can vary maintaining the PWM regulation.
t
ON
t
ON
t
ON MIN
t
RCRISE
)
>
1.5
μ
s (typ. value)
=
t
DT
–
>
0.1
1
10
100
1
10
100
1.10
3
1.10
4
Coff [nF]
t
μ
s
R
off
= 100k
R
off
= 47k
R
off
= 20k
0.1
1
10
100
1
10
100
Coff [nF]
t
μ
s
1.5
μ
s (typ. value)
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