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參數(shù)資料
| 型號： | 2919 |
| 廠商： | Allegro MicroSystems, Inc. |
| 元件分類： | 基準電壓源/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)： | 4/8頁 |
| 文件大小： | 98K |
| 代理商： | 2919 |
2919
DUAL FULL-BRIDGE
MOTOR DRIVER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
APPLICATIONS INFORMATION
PWM CURRENT CONTROL
The A2919SB/SLB dual bridges are
designed to drive both windings of a bipolar
stepper motor. Output current is sensed and
controlled independently in each bridge by
an external sense resistor (R
S
), internal
comparator, and monostable multivibrator.
When the bridge is turned ON, current
increases in the motor winding and flows
through the external sense resistor until the
sense voltage (V
S
) reaches the level set at
the comparator’s input:
I
TRIP
= V
REF
/10 R
S
The comparator then triggers the
monostable, which turns OFF the source
driver of the bridge. The actual load current
peak will be slightly higher than the trip point
(especially for low-inductance loads) be-
cause of the internal logic and switching
delays. This delay (t
d
) is typically 2
μ
s. After
turn-off, the motor current decays, circulating
through the ground-clamp diode and sink
transistor. The source driver’s OFF time
(and therefore the magnitude of the current
decrease) is determined by the monostable’s
external RC timing components, where
t
= R
T
C
within the range of 20 k
to
100 k
and 100 pF to 1000 pF.
When the source driver is re-enabled,
the winding current (the sense voltage) is
again allowed to rise to the comparator’s
threshold. This cycle repeats itself, maintain-
ing the average motor winding current at the
desired level.
Loads with high distributed capacitances
may cause current spikes capable of tripping
the comparator, resulting in erroneous
current control. An external R
C
C
C
time delay
should be used to delay the action of the
comparator. Depending on load type, many
applications will not require these external
components (SENSE connected to E).
PWM OUTPUT CURRENT WAVE FORM
LOAD CURRENT PATHS
+
–
0
Dwg. WM-003-1A
V
PHASE
I
OUT
t
d
t
off
I
Dwg. EP-006-1
RS
BB
V
BRIDGE ON
SOURCE OFF
ALL OFF
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