- 您现在的位置：买卖IC网 > PDF目录1773 > A4934GLPTR-T (Allegro Microsystems Inc)IC BLDC DVR 3PHASE 16-ETSSOP PDF资料下载
参数资料
| 型号： | A4934GLPTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 5/9页 |
| 文件大小： | 0K |
| 描述： | IC BLDC DVR 3PHASE 16-ETSSOP |
| 标准包装： | 1 |
| 应用： | 风扇电机驱动器，3 相 |
| 输出数： | 1 |
| 电流 - 输出： | 500mA |
| 电源电压： | 8 V ~ 16 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 标准包装 |
| 其它名称： | 620-1382-6 |
A4934
Three-Phase Sensorless Fan Driver
Functional Description
The driver system is a three-phase, BEMF sensing motor control-
ler and driver. Commutation is controlled by a proprietary BEMF
sensing technique.
The motor drive system consists of three half bridge NMOS
outputs, BEMF sensing circuits, adaptive commutation control,
and state sequencer. The sequencer determines which output
devices are active. The BEMF sensing circuits and adaptive com-
mutation circuits determine when the state sequencer advances to
the next state.
A complete self-contained BEMF sensing commutation scheme is
provided. The three half-bridge outputs are controlled by a state
machine with six possible states, shown in figure 1. Motor BEMF
is sensed at the tri-stated output for each state.
BEMF sensing motor commutation relies on the accurate com-
parison of the voltage on the tri-stated output to the voltage at the
center tap of the motor. The BEMF zero crossing, the point where
the tri-stated motor winding voltage crosses the center tap volt-
age, is used as a positional reference. The zero crossing occurs
roughly halfway through one commutation cycle.
Adaptive commutation circuitry and programmable timers
determine the optimal commutation points with minimal
external components. The major blocks within this system are:
the BEMF zero crossing detector, Commutation Delay timer, and
the Blank timer.
BEMF Zero Cross Detection
BEMF zero crossings are detected by comparing the voltage at
the tri-stated motor winding to the voltage at the motor center
tap. Zero crossings are indicated by the FCOM signal, which
goes high at each valid zero crossing and low at the beginning
of the next commutation. In each state, the BEMF detector looks
for the first correct polarity zero crossing and latches it until the
next state. This latching action, along with precise comparator
hysteresis, makes for a robust sensing system. At the beginning
of each commutation event, the BEMF detectors are inhibited for
a period of time set by the Blank timer. This is done so that com-
mutation transients do not disturb the BEMF sensing system.
Commutation Event
See figure 1 for timing relationships. The commutation sequence
is started by a CDCOM pulse or a valid XCOM at startup. After
Output
State
A
B
C
D
E
F
A
B
C
D
E
F
OUTA
OUTB
OUTC
FCOM
CDCOM
FG
Figure 1. Motor Terminal Output States
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
相关PDF资料 |
PDF描述 |
|---|---|
| A4936METTR-T | IC DC MOTOR PREDRIVER 3PH 32QFN |
| A4938EETTR-T | IC DC MOTOR PREDRIVER 3PH 28-QFN |
| A4941GLPTR-T | IC MOTOR DRIVER 3PH 16-TSSOP |
| A4950KLJTR-T | IC MOTOR DVR FULL-BRIDGE 8-SOIC |
| A4954ELPTR-T | IC PWM MOTOR DVR DUAL 16-ETSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| A4935 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Automotive 3-Phase MOSFET Driver |
| A4935_12 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A4935 is a 3-phase controller for use with N-channel external power MOSFETs and is specifically designed for automotive applications. |
| A4935_13 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Automotive 3-Phase MOSFET Driver |
| A4935KJP-T | 功能描述:IC MOSFET DRIVER 3PH AUTO 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:50 系列:- 配置:高端 输入类型:非反相 延迟时间:200ns 电流 - 峰:250mA 配置数:1 输出数:1 高端电压 - 最大（自引导启动）:600V 电源电压:12 V ~ 20 V 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-DIP 包装:管件 其它名称:*IR2127 |
| A4935KJPTR-T | 功能描述:IC MOSFET DVR AUTO 3PH 48-LQFP 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 |
发布紧急采购，3分钟左右您将得到回复。