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： 完全集成的步進電機驅(qū)動器
文件頁數(shù)： 12/27頁
文件大?。?/td> 453K
代理商： L6208PD
L6208
12/27
Figure 11. Output Current Regulation Waveforms
Figure 12 shows the magnitude of the Off Time t
OFF
versus C
OFF
and R
OFF
values. It can be approximately
calculated from the equations:
t
RCFALL
= 0.6 · R
OFF
· C
OFF
t
OFF
= t
RCFALL
+ t
DT
= 0.6 · R
OFF
· C
OFF
+ t
DT
where R
OFF
and C
OFF
are the external component values and t
DT
is the internally generated Dead Time with:
20K
≤
R
OFF
≤
100K
0.47nF
≤
C
OFF
≤
100nF
t
DT
= 1μs (typical value)
Therefore:
t
OFF(MIN)
= 6.6μs
t
OFF(MAX)
= 6ms
These values allow a sufficient range of t
OFF
to implement the drive circuit for most motors.
The capacitor value chosen for C
OFF
also affects the Rise Time t
RCRISE
of the voltage at the pin RCOFF. The
Rise Time t
RCRISE
will only be an issue if the capacitor is not completely charged before the next time the
monostable is triggered. Therefore, the on time t
ON
, which depends by motors and supply parameters, has to
be bigger than t
RCRISE
for allowing a good current regulation by the PWM stage. Furthermore, the on time t
ON
can not be smaller than the minimum on time t
ON(MIN)
.
OFF
B
C
D
D
A
t
ON
t
OFF
t
OFF
B
C
ON
2.5V
0
Fast Decay
Fast Decay
Slow Decay
Slow Decay
1
μ
s t
BLANK
t
RCRISE
1
μ
s t
DT
1
μ
s t
DT
t
RCRISE
t
RCFALL
t
RCFALL
SYNCHRONOUS OR QUASI
SYNCHRONOUS RECTIFICATION
1
μ
s t
BLANK
5V
V
RC
V
SENSE
V
REF
I
OUT
V
REF
R
SENSE
D01IN1334
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