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参数资料
| 型号： | 8925 |
| 厂商： | Allegro MicroSystems, Inc. |
| 英文描述： | 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH LINEAR CURRENT CONTROL AND POWER DMOS OUTPUTS |
| 中文描述： | 3相无刷直流电动机控制器/驱动器，线性电流控制和电源DMOS输出 |
| 文件页数： | 4/8页 |
| 文件大小： | 86K |
| 代理商： | 8925 |
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
8925
3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER
WITH LINEAR CURRENT CONTROL
AND POWER DMOS OUTPUTS
Term.
Terminal Name
Function
1
2
3
OUT
B
Power DMOS output.
V
CC
; low-current 12 V supply for the logic.
Low-level logic ground.
LOGIC SUPPLY
LOGIC GROUND
4
6
OUT
C
ENABLE
Power DMOS output.
Active high chip enable.
7
–
17
18
19
POWER GROUND
V
SENSE
COMP.
Power ground and thermal heat sink.
External precision resistor for sense-FET current.
Compensation; error amplifier output.
20
21
REFERENCE
ERROR AMP.
V
REF
; voltage input that sets the power output current.
Input that controls the current in the load.
22
23
LOAD SUPPLY
BRAKE
V
BB
; high-current 12 V supply for the voice-coil motor.
A logic low turns OFF all source drivers and turns ON all sink drivers (shorts the windings to
ground).
High-level input from a Hall sensor.
High-level input from a Hall sensor.
24
26
H
1
H
2
H
3
28
High-level input from a Hall sensor.
Power ground and thermal heat sink.
29
–
39
POWER GROUND
40
FAULT
A logic low at this output indicates a thermal shutdown, under -voltage fault, or an invalid Hall
input combination.
42
43
44
OUT
A
TACH
POLE
Power DMOS output.
Speed reference output; the H
1
Hall input divided by the number of motor poles.
Designates four- or eight-pole motor; Low = 4 pole, High = 8 pole.
FUNCTIONAL DESCRIPTION
Power Outputs
(OUT
A
, OUT
B
, and
OUT
C
).
The power outputs of the A8925CEB
are DMOS transistors with a maximum r
DS(on)
of 0.25
. Intrinsic ground clamp and flyback
diodes clamp transient voltage spikes when
switching inductive loads. Internal charge
pump circuitry is used to drive the gates of
the N-channel source drivers to their required
gate voltages.
Current Control.
Current in the load is
monitored by an internal sense amplifier that
produces an output current that is approxi-
mately one twelve hundredth that of the load
current (see Figure). This current is output to
the V
SENSE
terminal and develops a voltage
V
SEQUENTIAL
LOGIC
CHARGE
PUMP
SENSE
AMPLIFIER
BB
SUB
ERROR
AMPLIFIER
V
SENSE
V
REF
COMP.
C
1
+
+
-
R
1
R
2
Dwg. EP-040
_
R
3
C
2
R
S
OUT
OUT
I .
1200
V
Continued next page...
TERMINAL FUNCTIONS
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| 8925.2 | 功能描述:安全继电器 RMB2U8, 8ch Relay Module110VAC, DPDT, Bussed, N RoHS:否 制造商:Phoenix Contact 触点形式: 线圈电压:24 VDC 触点额定值:230 mA 端接类型:Spring Cage |
| 8925.3 | 功能描述:安全继电器 RMB2X8, 8ch Relay Module220VAC, DPDT, Bussed, N RoHS:否 制造商:Phoenix Contact 触点形式: 线圈电压:24 VDC 触点额定值:230 mA 端接类型:Spring Cage |
| 892513-000 | 制造商:TE Connectivity 功能描述:HEAT SHRNK TBING POLYFN BLU SPL - Cable Rools/Shrink Tubing 制造商:TE Connectivity 功能描述:HEAT SHRINK TUBING 制造商:TE Connectivity 功能描述:Heat Shrink Tubing ST Polyolefin Blue Thin Spool 制造商:TE Connectivity 功能描述:MT2000-2.0-6-SP |
| 892531-000 | 制造商:TE Connectivity 功能描述:55 CABLE - Cable Rools/Shrink Tubing 制造商:TE Connectivity 功能描述:55PC2211-18-9-92CS2502 |
| 89254-02 | 功能描述:键锁开关 FLASH/KEY SWITCHES RoHS:否 制造商:C&K Components 触点形式:1 Form A (SPST-NO) 开关功能:Momentary 触点额定值: 电流额定值:100 mA 电压额定值 AC:250 VAC 端接类型:Through Hole 键类型:Keyswitch 变址: 位置数量:1 外壳材料: |
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