參數(shù)資料
型號(hào)： L6223
廠商： 意法半導(dǎo)體
英文描述： DMOS Programmable High Speed Unipolar Stepper Motor Driver(高速單極步進(jìn)電機(jī)驅(qū)動(dòng)器)
中文描述： DMOS的可編程高速單極性步進(jìn)電機(jī)驅(qū)動(dòng)器（高速單極步進(jìn)電機(jī)驅(qū)動(dòng)器）
文件頁數(shù)： 19/33頁
文件大?。?/td> 1078K
代理商： L6223
2) Back EMF (BEMF) equal to 80% of its peak
during the phase change and equal to 50% of its
peak during the choppingperiod.
3) Constant slope of the current during t
ON
, t
OFF
and for power calculation during the phase
change (See t
1
in Fig.27).
4) Currentimbalance supposedto be zero.
5) Current ripple during the chopping neglegible.
As was previously stated, the current chopping is
obtained by means of one PWM Loop that con-
trols the charge time t
ON
of the inductanceof the
windings, A andB for example in fig.22.
This time starts each clock pulse and stops when
Q5 is switched OFF becauseof thecondition:
V
ref
= 2 R
S
I
p
.
A factor 2 is required because the single sensing
resistor R
S
is crossed by the peak current I
p
flow-
ing through each of the two energized windings
(A of MA; B of MB).
This configuration can produce an imbalance be-
tween the two peak currents because at the
phase changethe BEMFof one winding (MA) can
be out of phase with respect to the BEMF of the
other one (MB); in addition, an imbalance may
also occur at the phase change when the Power
Supply Voltage selected is too low and/or when
one motoris drivenwith too large Lm/Rm ratio.
Neverthelessin most of the applications the dissi-
pated power is not increased and there is no sig-
nificant changein torque.
During t
ON
the current Ip, flowing through the
phase A (seg.Fig. 24), is defined by V
ON
V
ON
V
S
- R
tot
Ip - BEMF
where R
tot
= R
S
+ R
m
+ R
DSON tot
in which R
m
is the winding resistance of the
phase A and R
DSON tot
is the sum of the R
DSON
of
Q1 and Q5: R
m
and BEMF are not shown on the
Figure 24.
At the end of t
ON
, the current starts its slow decay
and jumps to I
p
/2 (see Fig. 25) since the total in-
ductance becomes four times L
m
(perfect cou-
pling) that is the inductanceof the phase A alone.
The recirculation time t
OFF
is definedby:
V
OFF
2BEMF+ I
P
(R
m
+ R
DSONQ1
)
since R
DSONQ1
= R
DSONOQ2
.
The current through Q1 is shown in Fig. 26: the
current ripple is on lp and I
P
/2 during t
ON
and t
OFF
respectively.It can be obtained the Duty Cycle:
DC = V
OFF
/ (2V
ON
+ V
OFF
)
since 2V
ON
t
ON
= V
OFF
t
OFF
The slow decay allows a small current ripple as
earlier It is considered equal to zero. The current
through the phases A and B can be seen in Fig.
27 where the InA and InB signals (see Fig. 22)
are shown as well.
These two signals are 90
°
out of phase with each
other and they are 180
°
out of phasewith the cor-
responding inputs of the IC. In A and In B are not
shown in the Figure.
During the time Tp the motor goes through four
steps and the rotation speed V
rot
(step/sec) can
be given by:
V
rot
= 4/T
p
.
By considering what was statedabove, the follow-
ing can be applied:
1) Dissipated power by the 4 sink power DMOS
(Q1to Q4).
PdL
4 R
DSONQ1
I
p
2
T
P
T
1
3
+
T
p
2
+
T
1
1
+
DC
2
2) Dissipated power by Q5 (PdH).
PdH
4R
DSONQ5
I
p
2
DC
+
T
1
T
p
4
3
4DC
wherethe phase change duration is:
T
1
=
L
m
R
tot
log
e
1
2
R
tot
I
p
V
s
1.6 BEMF
+
R
tot
I
P
The chopping produces little power dissipation.
It’s value can be approximatedby:
3) Pdch
8
10
-3
V
s
I
p
The sum of 1) + 2) + 3) gives the dissipated
power of the output stage. To obtain the total
amount of dissipated power it’s necessary to in-
clude the power dissipation produced by the qui-
escent currents I
S
(from the power stage) and I
SS
(fromthe Logicalcircuits):
P
do
= V
S
I
S
+ V
SS
I
SS
,
considering I
S
constatversusV
S
. Finally:
P
tot
= PdL + PdH + Pdch + Pdo
Example
SupplyVoltage
Logic Voltage
Peak current (per phase)I
p
= 0.7A
Motorresistance
Motorinductance
Rotationspeed
Peak of the BEMF
Max ambient temperature T
amb
= 50
°
C
Max junction temperature T
j
= 125
°
C
Fromthe Electrical Characteristics of the L6223
(Typical value):
InternalReferenceVoltage V
ref
= 0.5V
SinkDMOS R
DSON
R
DSON
L = 1.2
SourceDMOSR
DSON
R
DSON
H = 0.7
PowerSupply Current
Logic Supply Current
V
S
= 36V
V
SS
= 5V
R
m
= 9
L
m
=6mH
V
rot
= 500step/sec(const)
BEMF = 1 Vp
atT
amb
=50
°
C
at
Tj= 25
°
C
Worst
Case
I
S
= 4 mA
I
SS
= 20 mA
FromFig. 3 (see pag. 6) the following is obtained:
α
1.65 at Tj = 125
°
C.
TheDMOS ON-Resistancesbecome(worst case):
L6223
19/33
相關(guān)PDF資料
PDF描述
L6226 DMOS DUAL FULL BRIDGE DRIVER
L6226D DMOS DUAL FULL BRIDGE DRIVER
L6226N DMOS DUAL FULL BRIDGE DRIVER
L6226PD DMOS DUAL FULL BRIDGE DRIVER
L6228 DMOS DRIVER FOR BIPOLAR STEPPER MOTOR
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6223A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
L6225 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DMOS DUAL FULL BRIDGE DRIVER
L6225_03 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:DMOS DUAL FULL BRIDGE DRIVER
L6225D 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
L6225DTR 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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