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参数资料
| 型号： | A4938EETTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 1/10页 |
| 文件大小： | 0K |
| 描述： | IC DC MOTOR PREDRIVER 3PH 28-QFN |
| 标准包装： | 1 |
| 应用： | DC 电机控制器，无刷（BLDC），3 相 |
| 输出数： | 1 |
| 电源电压： | 8.5 V ~ 30 V |
| 工作温度： | -40°C ~ 85°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 |
| 包装： | 标准包装 |
| 其它名称： | 620-1383-6 |
A4938
3-Phase Brushless DC Motor Pre-Driver
Features and Benefits
? Drives 6 N-channel MOSFETs
? Synchronous rectification for low power dissipation
? Internal UVLO and thermal shutdown circuitry
? Hall element inputs
? PWM current limiting
? Dead time protection
? FG outputs
? Standby mode
? Lock detect protection
? Overvoltage protection
Package: 28-contact QFN (ET package)
Approximate Scale 1:1
Description
The A4938 is a complete 3-phase brushless DC (BLDC) motor
pre-driver, supplying direct, high-current gate drive of an all
N-channel power MOSFET 3-phase bridge. The device has
three Hall-element inputs, a sequencer for commutation control,
fixed off-time pulse width modulation (PWM) current control,
and locked-rotor detection.
Output current is scaled by the capability of the external
MOSFETs. Locked rotor detection delay is set by an external
capacitor on the CLD terminal. The ENABLE, DIR, and
BRAKEZ inputs can be used to control motor speed, position,
and torque. Motor speed can be determined using the FG1
output.
The external MOSFETS can be PWMed using an external
signal on the PWM input, or using the internal PWM current
regulator. In either case, the A4938 synchronous rectification
feature reduces power dissipation by turning on the appropriate
MOSFETs during current decay.
The Hall elements can be inexpensive types, when used with
noise filtering to prevent false commutation signals. The
A4938 provides a regulated 5.0 V supply to power the three
Hall elements. Internal circuit protection includes thermal
Continued on the next page…
Typical Application
0.1 μ F
0.1 μ F
0.1 μ F 2 k Ω
0.1 μ F
CLD HBIAS
OVP
CP1
CP2 VCP VBB
GHA
V IN
System
Control
Logic
V IN
FG
BRAKEZ
ENABLE
DIR
A4938
SA
GLA
GHB
SB
GLB
GHC
SC
GLC
M
SENSE
GND HA+ HA– HB+ HB– HC+ HC–
A4938-DS
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相关代理商/技术参数 |
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|---|---|
| A4939KLPTR-5-T | 功能描述:Motor Driver Power MOSFET Parallel 28-TSSOP-EP 制造商:allegro microsystems, llc 系列:- 包装:带卷（TR） 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:并联 技术:功率 MOSFET 步进分辨率:- 应用:汽车级 电流 - 输出:- 电压 - 电源:5.5 V ~ 50 V 电压 - 负载:- 工作温度:-40°C ~ 150°C（TA） 安装类型:表面贴装 封装/外壳:28-SOIC（0.173"，4.40mm 宽）裸露焊盘 供应商器件封装:28-TSSOP-EP 标准包装:4,000 |
| A4940 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Automotive Full Bridge MOSFET Driver |
| A4940KLPTR-T | 功能描述:IC MOSF DVR FULL BRIDGE 24TSSOP 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:95 系列:- 配置:高端和低端，独立 输入类型:非反相 延迟时间:160ns 电流 - 峰:290mA 配置数:1 输出数:2 高端电压 - 最大（自引导启动）:600V 电源电压:10 V ~ 20 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:管件 产品目录页面:1381 (CN2011-ZH PDF) |
| A4941 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:The A4941 three-phase motor driver incorporates BEMF sensing to eliminate the requirement for Hall sensors in fan applications. |
| A4941GLP-T | 制造商:Allegro MicroSystems LLC 功能描述: |
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