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參數(shù)資料
| 型號(hào)： | L6235D |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | DMOS DRIVER FOR THREE-PHASE BRUSHLESS DC MOTOR |
| 中文描述： | DMOS的驅(qū)動(dòng)三相無(wú)刷直流電動(dòng)機(jī) |
| 文件頁(yè)數(shù)： | 10/25頁(yè) |
| 文件大小： | 434K |
| 代理商： | L6235D |
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L6235
10/25
Figure 8. Output Current Regulation Waveforms
Figure 9 shows the magnitude of the Off Time t
OFF
versus C
OFF
and R
OFF
values. It can be approximately cal-
culated 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)
.
t
RCRISE
= 600 · C
OFF
OFF
B
C
D
D
A
t
ON
t
OFF
B
C
ON
2.5V
0
Slow Decay
Slow Decay
1
μ
s t
BLANK
t
RCRISE
t
RCRISE
SYNCHRONOUS RECTIFICATION
1
μ
s t
BLANK
5V
V
RC
V
SENSE
V
REF
I
OUT
V
REF
R
SENSE
D02IN1351
t
OFF
1
μ
s t
DT
1
μ
s t
DT
t
RCFALL
t
RCFALL
t
ON
t
ON
t
ON MIN
t
RCRISE
)
>
>
1.5
μ
s (typ. value)
=
t
DT
–
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