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參數資料
| 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電機驅動 |
| 文件頁數： | 5/8頁 |
| 文件大?。?/td> | 98K |
| 代理商： | 2919 |
2919
DUAL FULL-BRIDGE
MOTOR DRIVER
LOGIC CONTROL OF OUTPUT CURRENT
Two logic level inputs (l
and I
) allow digital selection
of the motor winding current at 100%, 67%, 41%, 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.
CURRENT-CONTROL TRUTH TABLE
l
0
L
I
1
L
Output Current
V
REF
/10 R
S
= 100% I
TRIP
V
REF
/15 R
S
= 67% I
TRIP
V
REF
/24.4 R
S
= 41% I
TRIP
0
H
L
L
H
H
H
These logic level inputs greatly enhance the implem-
entation of
μ
P-controlled drive formats.
During half-step operations, l
and l
allow the
μ
P to
control the motor at a constant torque between all posi-
tions in an eight-step sequence. This is accomplished by
digitally selecting 100% drive current when only one phase
is ON and 67% drive current when two phases are ON.
Logic highs on both l
0
and l
1
turn OFF all drivers to allow
rapid current decay.
During quarter-step operation, I
and I
allow the
μ
P to
control the motor position in a sixteen-step sequence.
This is accomplished by digitally selecting drive current as
shown in the table (for one quadrant of operation). Logic
highs on both I
0
and I
1
turn OFF all drivers to allow rapid
current decay.
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.
QUARTER-STEPPING CURRENT CONTROL
Phase 1
Current Level
Phase 2
Current Level
100%
0%
100%
41%
67%
67%
41%
100%
0%
100%
GENERAL
The PHASE input to each bridge determines the
direction motor winding current flows. An internally
generated deadtime (approximately 2
μ
s) prevents cross-
over currents that can occur when switching the PHASE
input.
All four drivers in the bridge output can be turned OFF
between steps (l
= l
≥
2.4 V) resulting in a fast current
decay through the internal output clamp and flyback
diodes. The fast current decay is desirable in half-step and
high-speed applications. The PHASE, l
0
, and I
1
inputs
float high.
Varying the reference voltage (V
) provides continu-
ous control of the peak load current for micro-stepping
applications.
Thermal protection circuitry turns OFF all drivers when
the junction temperature reaches +170
°
C. It is only
intended to protect the device from failures due to exces-
sive junction temperature and should not imply that output
short circuits are permitted. The output drivers are re-
enabled when the junction temperature cools to +145
°
C.
The A2919SB/SLB output drivers are optimized for
low output saturation voltages—less than 1.8 V total
(source plus sink) at 500 mA. Under normal operating
conditions, when combined with the excellent thermal
properties of the batwing package design, this allows
continuous operation of both bridges simultaneously at
500 mA.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| 2919 SOCKET | 制造商:JKL Components Corporation 功能描述:T-3 1/4 Wedge Base Socket |
| 291-9.1/AP-RC | 功能描述:碳膜電阻器 - 透孔 9.1ohms 0.05 RoHS:否 制造商:KOA Speer 電阻:100 Ohms 容差:5 % 功率額定值:2 W 電壓額定值: 溫度系數:350 PPM / C 系列: 尺寸:4.2 mm Dia. x 12 mm L 工作溫度范圍:- 55 C to + 200 C 封裝:Reel |
| 291-9.1/REEL | 功能描述:碳膜電阻器 - 透孔 USE 291-9.1/REEL-RC RoHS:否 制造商:KOA Speer 電阻:100 Ohms 容差:5 % 功率額定值:2 W 電壓額定值: 溫度系數:350 PPM / C 系列: 尺寸:4.2 mm Dia. x 12 mm L 工作溫度范圍:- 55 C to + 200 C 封裝:Reel |
| 291-9.1/REEL-RC | 功能描述:碳膜電阻器 - 透孔 9.1ohms 0.05 RoHS:否 制造商:KOA Speer 電阻:100 Ohms 容差:5 % 功率額定值:2 W 電壓額定值: 溫度系數:350 PPM / C 系列: 尺寸:4.2 mm Dia. x 12 mm L 工作溫度范圍:- 55 C to + 200 C 封裝:Reel |
| 291-9.1K | 功能描述:碳膜電阻器 - 透孔 9.1Kohms 5% RoHS:否 制造商:KOA Speer 電阻:100 Ohms 容差:5 % 功率額定值:2 W 電壓額定值: 溫度系數:350 PPM / C 系列: 尺寸:4.2 mm Dia. x 12 mm L 工作溫度范圍:- 55 C to + 200 C 封裝:Reel |
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