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| 型号： | A4931MET-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC DC MOTOR PREDRIVER 3PH 28QFN |
| 标准包装： | 73 |
| 应用： | DC 电机驱动器，无刷（BLDC），3 相 |
| 输出数： | 1 |
| 电源电压： | 8 V ~ 33 V |
| 工作温度： | -20°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-VFQFN 裸露焊盘 |
| 供应商设备封装： | 28-QFN/MLP 裸露焊盘（5x5） |
| 包装： | 托盘 |
A4931
3-Phase Brushless DC Motor Pre-Driver
Functional Description
Current Regulation Load current is regulated by an internal
fixed off-time PWM control circuit. When the outputs of the full
bridge are turned on, current increases in the motor winding until
it reaches a value, I TRIP , given by:
I TRIP = 200 mV / R SENSE .
When I TRIP is reached, the sense comparator resets the source
enable latch, turning off the source driver. At this point, load
inductance causes the current to recirculate for the fixed off-time
period.
Enable Logic The Enable input terminal (ENB pin) allows
external PWM. ENB low turns on the selected sink-source pair.
ENB high switches off the appropriate drivers and the load
current decays. If ENB is held low, the current will rise until it
reaches the level set by the internal current control circuit. Typi-
cally PWM frequency is in 20 kHz to 30 kHz range. If the ENB
high pulse width exceeds 3 ms, the gate outputs are disabled. The
Enable logic is summarized in the following table:
ENB Pin Setting Outputs Outputs State
0 On Drive
Slow Decay with
1 Source Chopped Synchronous
Rectification
pletes, in order to provide the blanking function. The blanking
timer is reset when ENB is chopped or DIR is changed. With
external PWM control, a DIR change or an ENB on triggers the
blanking function. The duration is fixed at 1.5 μ s.
Synchronous Rectification When a PWM-off cycle is
triggered, either by a chop command on ENB or by an internal
fixed off-time cycle, load current recirculates. The A4931 syn-
chronous rectification feature turns on the appropriate MOSFETs
during the current decay, and effectively shorts out the body
diodes with the low R DS(on) driver. This lowers power dissipation
significantly and can eliminate the need for external Schottky
diodes.
Brake Mode A logic low on the BRAKEZ pin activates Brake
mode. A logic high allows normal operation. Braking turns on all
three sink drivers, effectively shorting out the motor-generated
BEMF. The BRAKEZ input overrides the ENB input and also the
Lock Detect function.
It is important to note that the internal PWM current control cir-
cuit does not limit the current when braking, because the current
does not flow through the sense resistor. The maximum current
can be approximated by V BEMF / R LOAD . Care should be taken to
insure that the maximum ratings of the A4391 are not exceeded
1 for > 3 ms typical
Off
Disable
in the worse case braking situation, high speed and high inertial
Fixed Off-Time The A4931 fixed off-time is set to 25 μ s
nominal.
PWM Blank Timer When a source driver turns on, a current
spike occurs due to the reverse recovery currents of the clamp
diodes as well as switching transients related to distributed
capacitance in the load. To prevent this current spike from errone-
ously resetting the source Enable latch, the sense comparator is
blanked. The blanking timer runs after the off-time counter com-
load.
HBIAS Function This function provides a power supply of
7.5 V, current-limited to 30 mA. This reference voltage is used to
power the logic sections of the IC and also to power the external
Hall elements.
Standby Mode To prevent excessive power dissipation due
to the current draw of the external Hall elements, Standby mode
turns off the HBIAS output voltage. Standby mode is triggered
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A4931METTR-T | 功能描述:IC DC MOTOR PREDRIVER 3PH 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电机和风扇控制器，驱动器 系列:- 标准包装:1 系列:- 应用:步进电机驱动器，1-2 相，2 相 评估套件:- 输出数:1 电流 - 输出:800mA 电压 - 负载:10 V ~ 28 V 电源电压:4.75 V ~ 5.25 V 工作温度:-20°C ~ 90°C 安装类型:表面贴装 封装/外壳:28-SOP + 2 翼片裸露焊盘 供应商设备封装:28-HSOPHC（15.2x7.9） 包装:剪切带 (CT) 其它名称:869-1268-1 |
| A4931METTR-T | 制造商:Allegro MicroSystems 功能描述:IC MOTOR PRE-DRIVER FULL BRIDGE QFN28 |
| A49323-000 | 制造商:TE Connectivity 功能描述:CTC-0015-22-9/5-9CS3182 - Cable Rools/Shrink Tubing 制造商:TE Connectivity 功能描述:Thermocouple Extension Cable 2Conductors 22AWG 3.6mm |
| A4933 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A4933 is a 3-phase controller for use with N-channel external power MOSFETs and is specifically designed for automotive applications. |
| A4933KJPTR-T | 功能描述:IC PREDRIVER MOSFET 3PH 48LQFP RoHS:是 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 外部开关 系列:- 标准包装:5 系列:- 配置:低端 输入类型:非反相 延迟时间:600ns 电流 - 峰:12A 配置数:1 输出数:1 高端电压 - 最大（自引导启动）:- 电源电压:14.2 V ~ 15.8 V 工作温度:-20°C ~ 60°C 安装类型:通孔 封装/外壳:21-SIP 模块 供应商设备封装:模块 包装:散装 配用:BG2A-NF-ND - KIT DEV BOARD FOR IGBT 其它名称:835-1063 |
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