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| 型号： | A4960KJPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 16/35页 |
| 文件大小： | 0K |
| 描述： | IC BLDC CTLR BRUSHLESS 32LQFP |
| 标准包装： | 1 |
| 系列： | * |
| 应用： | * |
| 输出数： | * |
| 电流 - 输出： | * |
| 电压 - 负载： | * |
| 电源电压： | * |
| 工作温度： | * |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-LQFP 裸露焊盘 |
| 供应商设备封装： | 32-LQFP（7x7） |
| 包装： | 标准包装 |
| 其它名称： | 620-1452-6 |
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A4960
Automotive, Sensorless BLDC Controller
will remain low until the first BEMF zero crossing is detected.
TACHO will then go high at each BEMF zero crossing and will
go low at each commutation point. Sensorless operation is also
indicated by a zero in LOS (Diagnostic bit 9), and by a high level
when the Sensorless Operation Indicator option is selected on the
DIAG pin output.
If sensorless operation cannot be achieved by the end of the
acceleration ramp, then the sequencer will reset and retry if RSC
(Run bit 3) is set to 1. This will continue until stopped by pulling
PWM or RESETN low, or by control via the serial interface. If
RSC is set to 0, then the retry will not take place, and the outputs
will remain off and the LOS bit will be set.
Motor control
The running state, direction, and speed of the motor are con-
trolled by a combination of commands through the serial inter-
face and by signals on specific terminals (see Applications
Information section). The serial interface provides three control
bits: RUN, DIR, and BRK (Run bits 2:0).
When RUN is set to 1, the A4960 is allowed to run the motor or
to commence the start-up sequence. When RUN is set to 0 all
gate drive outputs go low, no commutation takes place, and the
motor is allowed to coast. Setting RUN to 0 overrides all other
control inputs.
The DIR bit determines the direction of rotation. Forward is
defined as the state sequence shown in table 1, DIR (Run bit 1)
set to 0, incrementing in steps of one from 1 to 6, then repeating
from 1. Reverse (DIR set to 1) is decrementing in steps of one
from 6 to 1, then repeating from 6.
The BRK bit can be set to apply an electrodynamic brake which
will decelerate a rotating motor. It also can provide some holding
torque for a stationary motor. When RUN and BRK are both set
to 1, all low-side MOSFETs will be turned on and all high-side
MOSFETs turned off, effectively applying a short between the
motor windings. This allows the reverse voltage generated by
the rotation of the motor (motor BEMF) to set up a current in the
motor phase windings that will produce a braking torque. This
braking torque will always oppose the direction of rotation of the
motor. The strength of the braking or holding torque will depend
on the motor parameters. No commutation takes place during
braking and no current control is available. Care must be taken to
ensure that the braking current does not exceed the capability of
the low-side MOSFETs.
When RUN is set to 1, automatically LOS (Diagnostic bit 9)
is set to 1 and the Sensorless Operation Indicator option on the
DIAG pin output, if selected, is set low until sensorless operation
is achieved. When RUN is set to 0, or BRK is set to 1, the LOS
bit and the Sensorless Operation Indicator are inactive (LOS set
to 0 and DIAG set high).
When the motor is running, the motor speed can be varied by
applying a variable duty cycle input to the PWM terminal. The
motor speed will be proportional to the duty cycle of this signal
but will also vary with the mechanical load and the supply volt-
age. Precise speed control requires an external control loop which
can use the PWM input to vary the motor speed within the overall
closed loop speed controller. The motor speed can be determined
by monitoring the TACHO output. When the A4960 is running
with sensorless commutation, the TACHO output provides a
square wave output with a frequency proportional to the motor
speed.
The PWM input can be driven from 3.3 V or 5 V logic, and
has hysteresis and a filter to improve noise performance. When
pulsed low, any active high-side drivers will be turned off and the
complementary low-side drivers will be turned on. This provides
high-side chopped, slow-decay PWM with synchronous rectifica-
tion.
Holding the PWM input low for longer than the PWM brake
time, t BRK , will force a brake condition in the same way as the
BRK bit in the Run register. The brake will only be active when
RUN is set to 1.
Except for the PWM brake function, the PWM input will be
ignored during start-up, until sensorless commutation is achieved.
It also will also be ignored when BRK is set to 1.
Phase advance
In some motor control systems, improved motor performance can
be achieved by starting to energize the phase windings in advance
of the timing defined by the rotor position. This ensures that the
phase windings have reached the required current level at the
point where the resulting forward torque on the rotor will be most
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A4960SJPTR-T | 制造商:Allegro MicroSystems LLC 功能描述: |
| A496-2 | 制造商:APEM 功能描述:Switch Access Push Button Switch Round Cap |
| A4962KLPTR-T | 功能描述:IC MOTOR CONTROLLER 制造商:allegro microsystems, llc 系列:* 零件状态:有效 标准包装:4,000 |
| A496-3 | 制造商:APEM 功能描述: |
| A4963GLPTR-T | 功能描述:Motor Driver Power MOSFET SPI 20-TSSOP-EP 制造商:allegro microsystems, llc 系列:- 包装:剪切带（CT） 零件状态:有效 电机类型 - 步进:- 电机类型 - AC，DC:无刷 DC（BLDC） 功能:控制器 - 换向，方向管理 输出配置:前置驱动器 - 半桥（3） 接口:SPI 技术:功率 MOSFET 步进分辨率:- 应用:通用 电流 - 输出:- 电压 - 电源:4.2 V ~ 50 V 电压 - 负载:- 工作温度:-25°C ~ 150°C（TA） 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽）裸焊盘 供应商器件封装:20-TSSOP-EP 标准包装:1 |
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