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参数资料
| 型号： | A4960KJPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/35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
SCK Serial clock. Data is latched in from SDI on the rising edge
of SCK. There must be 16 rising edges per write and SCK must
be held high when STRN changes.
STRN Serial data strobe and serial access enable. When STRN
is high any activity on SCK or SDI is ignored, and SDO is high
impedance allowing multiple SDI slaves to have common SDI,
SCK, and SDO connections.
DIAG Diagnostic output. Programmable output to provide four
alternative functions: Fault output flag (default), Sensorless
Operation Indicator, internal timer, and V DS threshold.
TACHO Motor speed output. Provides a pulse signal with a
frequency proportional to the motor speed. TACHO remains low
until the first BEMF zero-crossing is detected.
Motor Drive System
Rotor position sensing using motor BEMF
Determining the rotor position using BEMF sensing relies on
the accurate comparison of the voltage on the undriven (tri-state)
motor phase (indicated by Z in table 1) to the voltage at the
centertap of the motor, approximated using a reference voltage at
half the supply voltage. The BEMF zero crossing, the point where
the tri-stated motor winding voltage crosses the reference voltage,
is used as a positional reference. When the motor is running at a
constant speed, this zero crossing occurs approximately halfway
through one commutation cycle. Adaptive commutation circuitry
and programmable timers then determine the optimal commuta-
tion points.
Zero crossings are indicated by the output at the TACHO termi-
nal, which goes high at each valid zero crossing and low at the
next commutation point, as shown in figure 9. In each state, the
BEMF detector looks for the first correct polarity (low-to-high
The motor drive system consists of three half bridge gate drive
outputs, each driving one leg of an external 3-phase MOSFET
power bridge. The state of the gate drive outputs is determined
by a state sequencer with six possible states. These states are
shown in table 1 and change in a set sequence depending on the
required direction of rotation. For the A4960, 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 effect of these states on the motor
phase voltage is illustrated in figure 11. The point at which the
state of the gate outputs changes is defined as the commutation
point and must occur each time the magnetic poles of the rotor
reach a specific point in relation to the poles of the stator. This
point is determined by a complete self contained BEMF sensing
scheme with an adaptive commutation timer.
State 1 2 3 4 5 6 1 2
SA
SB
SC
TACHO
Figure 9. Motor phase state sequence, DIR = 0
3
4
5
6
Table 1. Control and Phase Sequence Table
RUN
1
1
Control Bits
BRK DIR = 1
0
0
DIR = 0
State
1
2
SA
HI
Z
Motor Phase
SB
Z
HI
SC
LO
LO
GHA
HI
LO
GLA
LO
LO
Gate Drive Outputs
GHB GLB
LO
LO
HI
LO
GHC
LO
LO
GLC
HI
HI
Mode
1
1
1
1
0
0
0
0
3
4
5
6
LO
LO
Z
HI
HI
Z
LO
LO
Z
HI
HI
Z
LO
LO
LO
HI
HI
HI
LO
LO
HI
LO
LO
LO
LO
LO
HI
HI
LO
HI
HI
LO
LO
LO
LO
LO
Run
0
1
x
1
x
x
x
x
x
x
Z
LO
Z
LO
Z
LO
LO
LO
LO
HI
LO
LO
LO
HI
LO
LO
LO
HI
Coast
Brake
x: don’t care; HI: high-side MOSFET active; LO: low-side MOSFET active; Z: high impedance, both MOSFETs off
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
13
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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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