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參數(shù)資料
| 型號： | L6223A |
| 文件頁數(shù)： | 17/33頁 |
| 文件大?。?/td> | 1335K |
| 代理商： | L6223A |
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The behaviour of the oscillator at each phase
change allows the L6223A to drive high speed
unipolarstepper motors.
This is the main functionaldifference between the
L6223Aand the L6223 (see fig. 21b).
In the latter, the phase change starts only when
the clockpulse sets the F-F (Fig. 22) that is when
the capacitor voltage reaches the discharge
threshold.
As a result, a variable delay between the leading
edge of the input signal and the beginningof the
current decay to zero can be expected.
Because of that, driving high speedy stepper mo-
tors is produced a noisy beating between chop-
ping frequencyand phasechange rate.
In the L6223A as soon as the phase change is
driven by the inputs, the oscillator voltage Jumps
to its top level, a new discharge period is gener-
ated and the chopping transistor is switched ON
(Q5 in fig. 22). The
advantages are a motor
phase change synchronous to the driving signal
and no beating for whatever rotation speed. By
setting pin 14 at a voltage equal or less than Vrs
= 0.9V, when the IC is normally supplied and the
oscillator is running, the 6 bit shift register is
quickly reset and the power outputs are disabled:
a delay of 700nsecmax must be expected.
The use of this behaviour to reset the device at
the turn-on is not allowed; however the reset is
automatically provided by the Logic Supply Volt-
age crossing the threshold of 3.5V (typ.) both at
the turn-ONand at the turn-OFF.
Protection
The protection zeners on the outputs protect the
IC from overvoltage during chopping and phase
change. Actually, at the phase change, the out-
puts rise to a voltage equal to V
O
= 2V
S
+ V
m
,
where V
S
is the power supply and V
m
the product
of the motor resistance Rm with the peak phase
current Ip. Vs is doubled because in the unipolar
motor we have two coupled phases connected in
series(phase A and A, B and B) for each of the
two windings of the motor (MA, MB see Fig. 22).
The leakage inductance,seen from the outputs of
the L6223A, can generate an overvoltage higher
than V
O
. To protect the IC, the zeners must be
able to sustain a power of 400W for 1 microsec
and must be able to conduct at a voltage V
z
higher than V
0
= 2V
s(max)
+ V
m
. It’s important that
during the transition, at the max operating ambi-
ent temperature, the zener conductionis guaran-
teed for a voltage lower than 125V (see Absolute
Max Ratings). The ST-BZWO4-85 satisfies this
requirement. The diode connected to the com-
mon protects thisinput from theundergounds due
to the leakage inductances and/or the imbalanc-
ing between the phase currents.
Figure21a:
Relationshipbetweencapacitordischarge
of theoscillator,windowandsensingvoltage
Figure 21b:
Oscillator behaviourof the L6223 and
of the L6223A(simplified waveforms).
L6223A
17/33
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| L6225N | 功能描述:馬達/運動/點火控制器和驅(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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