参数资料
型号: A3977KLPTR-T
厂商: Allegro Microsystems Inc
文件页数: 9/19页
文件大小: 0K
描述: IC MOTOR DRVR PWM DUAL 28TSSOP
标准包装: 1
应用: 步进电机驱动器
输出数: 1
电流 - 输出: ±2.5A
电压 - 负载: 8 V ~ 35 V
电源电压: 3 V ~ 5.5 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 28-SOIC(0.173",4.40mm 宽)裸露焊盘
供应商设备封装: 28-TSSOP 裸露焊盘
包装: 标准包装
其它名称: 620-1145-6
A3977
Microstepping DMOS Driver with Translator
Functional Description (cont’d)
Synchronous Recti ? cation. When a PWM off-cycle is
triggered by an internal ? xed off-time cycle, load current
will recirculate according to the decay mode selected by
the control logic. The A3977 synchronous recti ? cation fea-
ture will turn on the appropriate MOSFETs during the cur-
rent decay and effectively short out the body diodes with
the low r DS(on) driver. This will reduce power dissipation
signi ? cantly and eliminate the need for external Schottky
diodes for most applications.
The synchronous recti ? cation can be set in either ac-
tive mode or disabled mode.
Active Mode. When the SR input is logic low, active
mode is enabled and synchronous recti ? cation will occur.
This mode prevents reversal of the load current by turning
off synchronous recti ? cation when a zero current level is
detected. This prevents the motor winding from conduct-
ing in the reverse direction.
Disabled Mode. When the SR input is logic high, syn-
chronous recti ? cation is disabled. This mode is typically
used when external diodes are required to transfer power
dissipation from the A3977 package to the external diodes.
Timing Requirements
(T A = +25°C, V DD = 5 V, Logic Levels are V DD and Ground)
A. Minimum Command Active Time
Before Step Pulse (Data Set-Up Time) ..... 200 ns
B. Minimum Command Active Time
After Step Pulse (Data Hold Time) ........... 200 ns
C. Minimum STEP Pulse Width ...................... 1.0 μ s
D. Minimum STEP Low Time ......................... 1.0 μ s
E. Maximum Wake-Up Time ......................... 1.0 ms
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
9
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A3977SED-T 功能描述:IC MOTOR DRIVER PWM DUAL 44-PLCC 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:直流电机驱动器,步进电机驱动器 评估套件:- 输出数:1 或 2 电流 - 输出:750mA 电压 - 负载:10 V ~ 40 V 电源电压:4.5 V ~ 5.5 V 工作温度:-20°C ~ 70°C 安装类型:表面贴装 封装/外壳:24-BFSOP(0.295",7.50mm 宽) 供应商设备封装:24-SOP 包装:Digi-Reel® 其它名称:MTS62C19A-HS105DKR
A3977SED-T 制造商:Allegro MicroSystems 功能描述:Driver IC Number of Drivers:2
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