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參數(shù)資料
| 型號： | 2917 |
| 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)： | 5/8頁 |
| 文件大?。?/td> | 178K |
| 代理商： | 2917 |
2917
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
www.allegromicro.com
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 erroneous 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-controlled 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 accomplished 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
To avoid excessive voltage spikes on the LOAD SUPPLY pin
(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 45 V.
The PHASE input to each bridge determines the direction motor
winding current flows. An internally generated deadtime (approxi-
mately 3
μ
s) prevents crossover currents that can occur when switch-
ing 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
output clamp and flyback 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 continuous 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 +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
re-enabled when the junction temperature cools to +145
°
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
CURRENT-CONTROL
TRUTH TABLE
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PDF描述 |
|---|---|
| 2918 | DUAL FULL-BRIDGE PWM MOTOR DRIVER |
| 2919 | DUAL FULL-BRIDGE PWM MOTOR DRIVER |
| 2920 | 20 MHz BIPOLAR LOGARITHMIC AMPLIFIER |
| 2927 | DUAL FULL-BRIDGE PWM MOTOR DRIVER |
| 292A | Low Cost Single and Multichannel Isolation Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 291-7.5 | 功能描述:碳膜電阻器 - 透孔 7.5ohms 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(shù):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 |
| 291-7.5/AP | 功能描述:碳膜電阻器 - 透孔 USE 291-7.5/AP-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(shù):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 |
| 291-7.5/AP-RC | 功能描述:碳膜電阻器 - 透孔 7.5ohms 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(shù):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 |
| 291-7.5/REEL | 功能描述:碳膜電阻器 - 透孔 USE 291-7.5/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(shù):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 |
| 291-7.5/REEL-RC | 功能描述:碳膜電阻器 - 透孔 7.5ohms 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(shù):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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