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參數(shù)資料
| 型號： | 2927 |
| 廠商： | Allegro MicroSystems, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | DUAL FULL-BRIDGE PWM MOTOR DRIVER |
| 中文描述： | 雙全橋PWM電機驅(qū)動 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大小： | 78K |
| 代理商： | 2927 |
2927
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
CURRENT-CONTROL
TRUTH TABLE
Loads with high distributed capacitances may result in
high turn-ON current peaks. This peak (appearing across
R
S
) will attempt to trip the comparator, resulting in errone-
ous current control or high-frequency oscillations. An
external R
C
C
C
low-pass filter may be needed to delay the
action of the comparator.
LOGIC CONTROL OF OUTPUT CURRENT:
Two logic level inputs (I
0
and I
1
) allow digital selection
of the motor winding current at 100%, 67%, 33%, or 0% of
the maximum level per the table. The 0% output current
condition turns OFF all drivers in the bridge and can be
used as an output enable function. These logic level
inputs greatly enhance the implementation of
μ
P-con-
trolled drive formats.
During half-step operations, the I
0
and I
1
inputs allow
the
μ
P to control the motor at a constant torque between
all positions in an eight-step sequence. This is accom-
plished by digitally selecting 100% drive current when only
one phase is ON and 67% drive current when two phases
are ON.
The logic control inputs can also be used to select a
reduced current level (and reduced power dissipation) for
‘hold’ conditions and/or increased current (and available
torque) for start-up conditions.
GENERAL:
Both bridges have internal flyback diodes (connected
from the outputs to V
BB
) for protection against inductive
transients. External ground-clamp diodes (connected
from the outputs to ground) are required; Schottky
ground-clamp diodes are recommended to minimize on-
chip power dissipation.
To avoid excessive voltage spikes on the LOAD
SUPPLY terminal (V
BB
), a large-value capacitor (
≥
47
μ
F)
should be connected from V
BB
to ground as close as
possible to the device. Under no circumstances should
the voltage at LOAD SUPPLY exceed 50 V. A low-value
(0.1
μ
F) ceramic capacitor at this terminal may be used
for high-frequency noise suppression.
The PHASE input to each bridge determines the
direction motor winding current flows. An internally
generated deadtime (approximately 3
μ
s) prevents
crossover currents that can occur when switching the
PHASE input.
All four drivers in the bridge output can be turned OFF
(V
EN
≥
2.4 V or I
0
= I
1
≥
2.4 V), resulting in a fast current
decay through the internal flyback and external ground-
clamp diodes. The fast current decay is desirable in half-
step and high-speed applications. All logic inputs float
high; the ENABLE input must be tied low if it is not used.
Varying the reference voltage (V
REF
) provides continu-
ous control of the peak load current for micro-stepping
applications, within the specified limits for V
REF
.
Thermal protection circuitry turns OFF all drivers
when the junction temperature reaches approximately
+170
°
C. It is only intended to protect the device from
failures due to excessive junction temperature and should
not imply that output short circuits are permitted. The
output drivers are reenabled when the junction tempera-
ture cools to approximately +160
°
C.
I
0
L
I
1
L
Output Current
V
REF
/10 R
S
= I
TRIP
H
L
V
REF
/15 R
S
=
2/3 I
TRIP
L
H
V
REF
/30 R
S
= 1/3 I
TRIP
H
H
0
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