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參數(shù)資料
| 型號(hào)： | L6223A |
| 文件頁(yè)數(shù)： | 18/33頁(yè) |
| 文件大?。?/td> | 1335K |
| 代理商： | L6223A |
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Use of the Programming Mode
A typical application of the L6223Arequires driv-
ing the motor accordingto Fig. 23a and Fig.23b.
Startingfrom t
0
= t
5
and continuinguntil t
1
the mo-
tor is kept in stand-by; at time t
1
begins an accel-
eration period that is completed at time t
3
. The
motor then is driven at a contant speed until t
4
,
when the speed is decelerated and is stopped at
t
5
= t
0
for a newstandbyperiod.
During these events the L6223A can be pro-
grammed several times for different working
modes. The most important parameter is the cur-
rent through the windings of the stepper: at the
time t
0
; t
1
; t
2
; t
3
and t
4
the current can be modi-
fied, for example, as it is shown in Fig. 23b. This
behaviour allows the best motion control and, at
the same time, optimizes efficency of the power
outputblock of the I. C.
But this is not the best in terms of performances
by programming: in fact, betweent
1
and t
5
the de-
vice can be programmed to work in Closed Loop
and to chop at half of the RC oscillator frequency
during the time t
3
to t
4
. In the stand-by condition
the I. C. can be programmed to work in Open
Loop mode where the current can be fixed by the
reduction of the minimum T
ON
time (75% or 50%)
defined by thedischarge time of the RC oscillator.
Of course in this way the current can be modified
by Supply Voltage changes; the same is not pos-
sible in Closed Loop operation where the device,
in order to keep the windings current constant,
modifies the T
ON
time: wide at low V
S
and narrow
at high V
S
. Thisis thereason why when the motor
is driven at a constant speed (t
3
to t
4
) with small
current and high Supply Voltage, it could become
necessary to program the lower chopping fre-
Figure 23:a,b)
Speedprofileand motorcurrent
control changefor the best efficencyof the I.C.
c,d)
Currentcontrol change by using DA/CLEV
input only, during the stand-by period.
a
b
c
d
quency to allow a suitable T
ON
width otherwise
the current of the windings would go out of con-
trol.
The motion profile, shown in Fig. 23a can be ob-
tained when preferred, with only two program
changes actuated while the motor is in stand-by.
The current becomes as shown in Fig. 23c. The
device can be programmed at t
0
= t
5
for I
motor
=
55% (stand-by) and at t
1
for I
motor
= 70%: for both
the actuations,the DA/CLEV is kept high to allow
the program change, while, by keeping it to zero
during t
1
- t
3
and t
4
- t
5
, the current is automat-
ically select as 100% (Fig. 23d). During t
3
- t
4
the
current is reduced according to the percentage
programmedat the time t
1
.
Power dissipation
(Simplified method of calcula-
tion).
Here below the Full Step Operating Mode is con-
sidered; in addition, the following working condi-
tions have been taken up:
1) Constant speed rotation of the driven unipolar
stepperMotor.
Figure22:
Pover output configuration.
L6223A
18/33
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| L6225N | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 Dual Full Bridge RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類(lèi)型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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