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參數(shù)資料
| 型號： | L6223A |
| 文件頁數(shù)： | 12/33頁 |
| 文件大?。?/td> | 1335K |
| 代理商： | L6223A |
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SHIFT REGISTER bITS
C4
C3
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Full/Simpl.
Operation
Mode
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
F
Close Loop
Frequency
(kHz)
20
20
20
20
20
20
20
20
20
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
Open Loop
t
(ON)
[%]
100
50
50
50
50
DISABLED
DISABLED
DISABLED
DISABLED
75
75
75
75
100
100
100
100
50
50
50
50
DISABLED
DISABLED
DISABLED
DISABLED
Close Loop
Current
Level [%]
85%
40%
70%
55%
85%
40%
70%
55%
85%
40%
70%
55%
85%
40%
70%
55%
85%
40%
70%
55%
85%
40%
70%
55%
85%
Nr
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
C5
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
C2
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
C1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
C0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
L6223A Operating Configuration vs. 6bitsShift Register Programming
(Continued)
APPLICATION INFORMATION
SingleDevice Application
Figure 10 shows a typical Single Device Applica-
tion. With the shown external RC network, the
higher choppingfrequencyis 20 kHz.
In the figure 11, 12 and 13 are shown the wave-
forms required to drive the motor in Half/Full Step
in FULL MODE OPERATING(FMO) and SIMPLI-
FIED MODE OPERATING (SMO). The sense re-
sistor defines the total motor current. This means
that when two phases are ON, the sense current
is two times the phase current. In this case the
sense resistor value is R
S
= (V
ref
/2I
p
), where V
ref
is the reference voltage and I
P
the phase current.
We have supposed that the phase current is of
the same intensity in the two phases. When only
one phase in ON, the current flowing in the sens-
ing resistor is the phase current: this occurs in
half step driving mode. The Figures 14 and 15
show the envelope of the sensing voltage in full
and half step respectively.
When current imbalance is not considered, this
envelope represents the current level 2I
p
control-
led by the chopping when L6223A is working at
100% of current; in full step this level is constant
while in half step two different levels are present
(Figure 15). Actually, in full step two phases are
always ON, and the choppingcurrent level can be
changed only by the controller. In half step when
two phases are ON and L6223A is working at
nominal current level (2I
p
), but when only one
phase is ON, L6223A selects automatically the
reduced current. This level dependsupon the pro-
gramming bits. In Figure 15 the higher level rep-
resents the chopping at nominal value (two
phases ON), the lower level the chopping at the
reduced current (one phase ON). The negative
peak shown in the figures representsthe fast cur-
rent recirculation at the phase change.
Fig. 15 shows also what happens when the re-
duced current level selected is at 70% of the
nominal value. The motortorque is proportionalto
the vectorial sum of the phase currents: it can be
seen that the unipolar stepper motor control actu-
ated by L6223A in half step is at constant torque
but not at constat current.
L6223A
12/33
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| L6225N | 功能描述:馬達(dá)/運(yùn)動/點(diǎn)火控制器和驅(qū)動器 Dual Full Bridge RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型: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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